50-g Oral Glucose Challenge Test Research Articles

A comparison study of maternal and perinatal outcomes with gestational diabetes mellitus, impaired glucose tolerance, and normal glucose tolerance

Gestational diabetes mellitus (GDM) and impaired glucose tolerance (IGT), which are growing health concerns globally, are the most common metabolic and endocrine perinatal issues. It is a contentious entity with competing policies and procedures. Most physicians in the United States employ a two-step procedure, starting with a 50-g non-fasting oral glucose challenge test at 24 to 28 weeks and moving on to a 100-g fasting test for women who receive a positive screening result. Instead, doctors use the Diabetes in Pregnancy Study Group India (DIPSI) technique and conduct just a 75-g, two-hour fasting oral glucose tolerance test. The prospective observational study was approved by the hospital's institutional ethics committee and was conducted from April 2020 to September 2021 at the department of obstetrics and gynecology at Stanley Medical College Hospital in Chennai, Tamil Nadu, India. The patients were chosen in accordance with the inclusion criteria, which called for first-trimester pregnant women without diabetes mellitus. Both oral and written consent were also obtained. DIPSI performed the screening. The WHO standards have been updated to be a one-step process with a single glycemic value. According to the results of this study, GDM is linked to harmful consequences that might affect both the mother and the foetus. The short- and long-term consequences in both the mother and the newborn can be greatly reduced with early detection and timely therapy of this illness. In this study, birth weights ranging from 2.5 to 3.5 kg were the same for GDM and IGT moms. IGT mothers should also be followed up on, and we should be more watchful at birth, even though we monitor GDM mothers.

Risk of obstetric and neonatal morbidity in gestational diabetes in a single institution: A retrospective, observational study.

Gestational diabetes mellitus (GDM) is defined as a carbohydrate intolerance with onset or first recognition occurring during pregnancy and GDM could be risk factor for various maternal fetal complications. This study aimed to investigate risks of maternal and neonatal outcomes according to GDM and normal glucose tolerance. This retrospective, observational study included singleton pregnant women who had received a 50-g oral glucose challenge test in 2nd trimester of gestation and gave birth at National Health Insurance Service Ilsan Hospital. Maternal and neonatal complications were compared between GDM and non-GDM groups. Among the 682 women, 56 were diagnosed with GDM and 626 were non-GDM group. Maternal age was older and prepregnant body mass index was higher in GDM. The rate of cesarean delivery, preeclampsia, and transfusion was similar; however, the incidence of preterm birth was higher in GDM. Multivariate analysis, however, showed that GDM was independent risk factor only for preterm birth in <37 weeks (adjusted odds ratio, 2.25; 95% confidence interval, 1.16–4.36). Regarding neonatal morbidities, APGAR score <7 at 5 minutes and the rate of macrosomia were similar; however, the rates of neonatal intensive care unit (NICU) admission, large for gestational age (LGA), and intubation were higher in GDM. Multivariate analysis, however, showed that GDM was not independent risk factor for LGA, NICU admission, and intubation rate. Compared with the non-GDM group, GDM was associated with an increased likelihood of preterm birth <37 weeks, however, did not increase cesarean delivery, postpartum hemorrhage, LGA, and NICU admission rate. This study showed that the majority of women with GDM delivered with similar maternal and neonatal outcomes in non-GDM women.

Clinical Updates on Screening and Diagnosis Criteria for Gestational Diabetes Mellitus Patients, as well as Therapeutic Management

The most prevalent metabolic and endocrine perinatal issue is gestational diabetes mellitus (GDM), which is an increasing health problem worldwide. It is a controversial entity, with conflicting guidelines and treatment protocols. In the United States, most doctors utilise a two-step strategy, first with a 50-g non fasting oral glucose challenge test at 24 to 28 weeks and then a 100-g fasting test for women who have a positive screening result. Alternatively, Clinicians take a one step Diabetes in Pregnancy Study Group India (DIPSI) method and perform simply a 75-g two hour fasting oral glucose tolerance test. The DIPSI approach of antenatal GDM screening has been demonstrated to be straightforward, cost effective, easy to use, patient friendly, and convenient. When comparing the findings to the gold standard of the International Association of Diabetes and Pregnancy Study Group (IADPSG), DIPSI shows high specificity and acceptable sensitivity. To maintain euglycemia, glucose monitoring, dietary changes, exercise, and, if necessary, medicines are used. Although insulin therapy is the most common treatment, glyburide and metformin may become more popular. Prenatal testing with nonstress tests and amniotic fluid indices, commencing in the third trimester, is commonly used to assess foetal well-being in women undergoing medication. The delivery technique and time are contentious. Women who have gestational diabetes are at a significant risk of developing type 2 diabetes later in life. As a result, along with routine diabetes screening, lifestyle adjustment should be recommended.

Diagnosis of Dysglycemia in Diabetic Patients in Primary Health Care

An early diagnosis of diabetes is a cornerstone for achieving the best prognostic outcomes. The potential complications take time to develop. For this reason, diabetic patients, especially type 2 are usually diagnosed with the disease after complications have been arisen. Dysglycemia is a term that has been used to describe the fluctuations in the plasma glucose levels, including the high (hyperglycemia) and low (hypoglycemia) levels, and can also refer to impaired glucose tolerance (IGT) or impaired fasting glucose (IFG). Many modalities have been developed to assess plasma glucose levels. Studies have shown that advantages and disadvantages are reported for each modality when assessing dysglycemia and screening for diabetes. The aim of this review is to discuss the previously reported diagnostic approaches of dysglycemia among diabetic patients according to the existing published studies in the literature. The study is related to the following: the 50-g oral glucose challenge test, HbA1c, fasting blood glucose, random blood sugar, and oral glucose tolerance tests in the assessment of the blood glucose fluctuating levels. Based on the findings, it is recommended that HbA1c levels assessment should be simultaneously conducted with the random and fasting blood glucose tests to decide which patients are required to perform an OGTT. Moreover, HbA1c tests might not be affordable in some healthcare settings although they are important indicators of long-term glycemic control.

Predictability of Macrosomic Birth based on Maternal Factors and Fetal Aneuploidy Screening Biochemical Markers in Hyperglycemic Mothers.

Background: Macrosomic birth weight has been implicated as a significant risk factor for developing various adult metabolic diseases such as diabetes mellitus and coronary heart diseases; it has also been associated with higher incidences of complicated births. This study aimed to examine the predictability of macrosomic births in hyperglycemic pregnant women using maternal clinical characteristics and serum biomarkers of aneuploidy screening performed in the first half of pregnancy.Methods: A retrospective observational study was performed on a cohort of 1,668 pregnant women who 1) had positive outcomes after undergoing 50-g oral glucose challenge test (OGCT) at two university-based hospitals and 2) underwent any one of the following maternal biomarker screening tests for fetal aneuploidy: triple test, quadruple test, and integrated test. Logistic regression-based models for predicting macrosomic births using maternal characteristics and serum biomarkers were developed and evaluated for prediction power. A nomogram, which is a graphical display of the best predictable model, was then generated.Results: The study cohort included 157 macrosomic birth cases defined as birth weight ≥3,820 g, which was equivalent to the top 10 percentile of the modeling cohort. Three primary models solely based on serum biomarkers achieved area under curves (AUCs) of 0.55-0.62. Expanded models, including maternal demographic and clinical factors, demonstrated an improved performance by 25% (AUCs, 0.69-0.73).Conclusion: Our prediction models will help to identify pregnancies with an elevated risk of macrosomic births in hyperglycemic mothers using maternal clinical factors and serum markers from routine antenatal screening tests. Prediction of macrosomic birth at mid-pregnancy may allow customized antenatal care to reduce the risk of macrosomic births.

Pregnancy Outcomes Among Class 3 Obese Women With Normal Early Glucola [31D

INTRODUCTION: ACOG recommends early screening for glucose intolerance in obese women, who are at increased risk of insulin resistance. We aimed to assess the risk of developing GDM based on the value of a normal early 50g oral glucose challenge test (GCT). METHODS: Retrospective cohort of non-anomalous singleton pregnancies with maternal BMI ≥40 at one institution, 2013–2017. Pregnancies with multiple gestation, late entry to care, type 1 or 2 diabetes, and missing diabetes-screening information are excluded. Primary outcome was development of GDM. Secondary outcomes include fetal growth restriction, fetal macrosomia, gestational age at delivery, large for gestational age, delivery BMI, total pregnancy weight gain, labor induction, shoulder dystocia, and cesarean delivery. Bivariate statistics compare demographics, pregnancy complications and delivery characteristics of women with early GCT &gt;100 and women who with early GCT 101–134. Regression models used to estimate odds of primary outcome. RESULTS: Of 169 women, 66 (39%) had an early GCT &lt;100, and 103 (61%) had an early GCT of 101–134. Women with low normal eGCT were more likely to use recreational drugs (P=.03). Other baseline demographics did not differ. The rate of GDM was low in this population (5.3%), with no difference in the rate of GDM between women with a low normal eGCT and high normal eGCT (P=.9). The median neonatal birthweight was higher in the normal GCT group as compared to the low GCT (P=.03). CONCLUSION: Among women with class 3 obesity, the specific value of an early normal GCT was not predictive of developing GDM by the third trimester.

Prevalance of Gestational Diabetes Mellitus in Overweight Pregnant Women in Urban Antenatal Clinic at 24-28 Weeks of Gestation

Introduction: Diabetes has become a significant health problem all over the world and its prevalence is increasing rapidly, including in Nepal. Prevalence of gestational diabetes mellitus (GDM) is directly related to the prevalence of type 2 diabetes. Women who areoverweight or obese before they become pregnant are more at risk of GDM irrespective of other factors.Though the risk of developing GDM in shown to be higher in overweight or obese women, there are very few studies done to show such observation in the urban population of Nepal.Methods: This was a hospital based cross-sectional prospective study conducted among the women attending ante partum clinic, in a tertiary level hospital, located at Lalitpur for one-year duration in 2009. All overweight (pre-pregnancy body mass index (BMI)&gt;23) urban women at 24-28 weeks of gestation were enrolled.Fasting blood glucose, screening 50-g oral glucose challenge test(OGTT) and 2-hr OGTT following overnight fastingwas done as per need based on their test results and GDM was diagnosed based on standard guidelines.Results: Out of 256 women majority of women had BMI &gt;25 kg/m2 (n=180),and 151(59%) were multiparous and 105 (41%) were primiparas. Positive screening test was obtained in 51 women (19.9%).The incidence of GDM by ADA and WHO criteria was 10 (3.9%) and 16 (6.3%) respectively. There was statistically non-significant difference in the rate of positive screening test and BMI (p=0.09). The abnormal screening test between primiparous and multiparous was significant (p=0.01).Conclusion: This study showed a high pre-pregnancy BMI and the incidence of GDMamong the patients enrolled. The rate of positive screening test is also higher than the previous studies so, GDM is a growing issue and must be well addressed.

Early Gestational Weight Gain Rate and Adverse Pregnancy Outcomes in Korean Women

During pregnancy, many women gain excessive weight, which is related to adverse maternal and neonatal outcomes. In this study, we evaluated whether rate of gestational weight gain (RGWG) in early, mid, and late pregnancy is strongly associated with adverse pregnancy outcomes. A retrospective chart review of 2,789 pregnant Korean women was performed. Weights were recorded at the first clinic visit, during the screening test for fetal anomaly, and during the 50g oral glucose challenge test and delivery, to represent early, mid, and late pregnancy, respectively. A multivariate logistic regression analysis was performed to examine the relationship between RGWG and adverse pregnancy outcomes. At early pregnancy, the RGWG was significantly associated with high risk of developing gestational diabetes mellitus (GDM), pregnancy-induced hypertension (PIH), large for gestational age (LGA) infants, macrosomia, and primary cesarean section (P-CS). The RGWG of mid pregnancy was not significantly associated with any adverse pregnancy outcomes. The RGWG at late pregnancy was significantly associated with a lower risk of developing GDM, preterm birth and P-CS, but with a higher risk of developing LGA infants and macrosomia. When the subjects were divided into three groups (Underweight, Normal, and Obese), based on pre-pregnancy body mass index (BMI), the relationship between early RGWG and adverse pregnancy outcomes was significantly different across the three BMI groups. At early pregnancy, RGWG was not significantly associated to adverse pregnancy outcomes for subjects in the Underweight group. In the Normal group, however, early RGWG was significantly associated with GDM, PIH, LGA infants, macrosomia, P-CS, and small for gestational weight (SGA) infants, whereas early RGWG was significantly associated with only a high risk of PIH in the Obese group. The results of our study suggest that early RGWG is significantly associated with various adverse pregnancy outcomes and that proper preemptive management of early weight gain, particularly in pregnant women with a normal or obese pre-pregnancy BMI, is necessary to reduce the risk of developing adverse pregnancy outcomes.

Screening For Gestational Diabetes Mellitus

Gestational diabetes is a carbonhydrate intolerance resulting in hyperglycaemia of variable severity with onset or first recognition during pregnancy. It is the most common metabolic disorder affecting pregnancy. Recognizing and treating diabetes or any degree of glucose intolerance in pregnancy results in lowering maternal and fetal complications. These patients present higher risk for excessive weight gain, preeclampsia, cesarean sections, a high risk of developing type 2 diabetes and cardiovascular disease in the future. Complications of infants are; higher risk for macrosomia, birth trauma, hypoglycemia, hypocalcemia, hyperbilirubinemia, respiratory distress syndrome, polycythemia, obesity and type 2 diabetes. Gestational diabetes mellitus (GDM) screening should be performed at 24-28 gestational weeks and followed by definitive testing in women who are labeled as high-risk population. Two strategies are used to screen for gestational diabetes. In the two-step approach, the 50-g oral glucose challenge test (OGCT) is performed between 24 and 28 weeks of gestation in a nonfasting state. Alternatively, in the one-step approach, a 75-g glucose load is administered after measuring a fasting glucose level, and the plasma glucose levels are evaluated after 1 and 2 hours of the administration. There are the other methods for screening, including HbA1C and fasting blood glucose, but an exact approach for gestational diabetes screening has not yet been established.

Maternal hyperglycemia and the 100-g oral glucose tolerance test

ObjectivesTo compare the characteristics of pregnant women with hyperglycemia according to the severity of glucose intolerance using the 100-g oral glucose tolerance test (OGTT) and to demonstrate the need to manage the condition of women with mild hyperglycemia. Materials and methodsIn this retrospective cohort study, a total of 258 women at high risk of gestational diabetes (GDM) based on a positive 50-g oral glucose challenge test (OGCT) were classified into 0+, 1+, 2+, 3+, and 4+ groups according to the number of abnormal plasma glucose values on the 100-g OGTT. The clinical characteristics of the groups were compared. ResultsThe rates of advanced maternal age (≥ 35 years), multiparity, prior history of GDM, preterm birth, cesarean delivery, and elevated body mass index were all positively correlated with the number of abnormal plasma glucose values on the OGTT (p < 0.05 for all variables). After adjusting for confounding factors, the fasting plasma glucose levels predicted birth weight in 44.4%, 48.4%, and 58.6% of the women in the positive 50-g OGCT group, the 0+ group, and the 1+ group, respectively. Weight gain during pregnancy predicted birth weight in 42%, 44.6%, and 37.6% of the women in the positive 50-g OGCT group, the 0+ group, and the 2+ group, respectively (p < 0.001 in each case). ConclusionsThese data demonstrate that the detection and management of mild hyperglycemia below the current diagnostic criteria of GDM as well as GDM diagnosed using the 100-g OGTT are necessary for improving pregnancy outcomes.

Prevalence of gestational diabetes mellitus and associated risk factors in Turkish women: the Trabzon GDM Study.

IntroductionThe aim of this study was to investigate the prevalence of gestational diabetes mellitus (GDM) in Turkish pregnant women in the Trabzon Region and further to identify population-specific risk factors for GDM.Material and methodsIn this prospective cross-sectional survey, universal screening for GDM was performed in 815 pregnant women. Screening was done with a 50-g oral glucose challenge test (GCT) with a 140 mg/dl cut-off point, then a diagnostic 100 g oral glucose tolerance test (OGTT) was performed according to Carpenter and Coustan (CC) criteria.ResultsThe GCT was positive in 182 (22.3%) cases. The OGTT was performed on the 182 screen-positive pregnant women. Thirty-five were diagnosed with GDM on the basis of their results for a prevalence of 4.3% (35/815). Of the pregnancies with negative GCT but having high risk factors for GDM (n = 31), 4 were diagnosed with GDM (0.5%). Prevalence of GDM was found to be 4.8% (n = 39) for all pregnant women. Gestational diabetes mellitus was positively associated with advanced maternal age (p < 0.001), prepregnancy body mass index (p < 0.001), cessation of cigarette smoking (p < 0.001), excessive weight gain during pregnancy (p = 0.003), previous history of GDM (p < 0.001), history of selected medical conditions (p = 0.018), family history of diabetes (FHD) (p < 0.001), and existence of at least one high risk factor for GDM (p < 0.001). In multiple logistic regression analysis, independent predictors for GDM were maternal age, cessation of cigarette smoking, increasing prepregnancy body mass index, weight gain of more than 8 kg during pregnancy, GDM history in previous pregnancies and a history of diabetes in first-degree relatives of pregnant women.ConclusionsThe prevalence of GDM in Trabzon province was found as moderate. Commonly recognized risk factors including older age, prepregnancy obesity, FHD and past history of GDM, are valid for our urban Turkish population. Also, excessive weight gain in pregnancy and cigarette cessation were observed to be nontradional risk factors of GDM. It was concluded that all pregnant women should be screened for GDM if prevalence was not low.

The effect of impaired 50‐gram oral glucose challenge test on fetal abdominal wall thickness

Patients with impaired 50-g oral glucose challenge test (OGCT) have not been investigated for fetal anterior abdominal wall thickness until now. We aimed to investigate patients with impaired 50-g OGCT, but not gestational diabetes and match them with healthy uneventful pregnant participants for anterior abdominal wall thickness, estimated fetal weight, fetal gender, biparietal diameter, femur length and abdominal circumference. A total of 99 pregnant women between 26 and 28 weeks of gestation were enrolled in the study. These patients were divided into two groups according to their 50-g OGCT results. Fifty-one pregnant women with uncomplicated healthy singleton pregnancies constituted our control group, and 48 singleton pregnant women with impaired 50-g OGCT but normal 100-g oral glucose tolerance test constituted our study group. We detected statistically significant high body mass index in impaired 50-g glucose test group. Biparietal diameter, femur length, abdominal circumference and estimated fetal weight values were not significantly different between groups; however, anterior abdominal wall thickness value was significantly width in impaired 50-g glucose test group. Moreover, there were no statistically significant differences between two groups for gender of fetuses. Impaired 50-g glucose test in pregnancy is related not only to increased maternal body mass index but also to fetal fat distribution. Although fetal abdominal circumference measurement and estimated fetal weight were not different between study and control group, increased anterior abdominal wall thickness can be detected in impaired 50-g OGCT group.

Correlation of continuous glucose monitoring profiles with pregnancy outcomes in nondiabetic women.

To determine whether hyperglycemic excursions detected by continuous glucose monitoring (CGM) correlate with birth weight percentile and other pregnancy outcomes, and whether CGM correlates better with these outcomes than a single glucose value from a 1-hour glucose challenge test (GCT). This was a prospective observational study of 55 pregnant patients without preexisting diabetes, who wore a CGM device for up to 7 days, between 24 and 28 weeks' gestation. The area under the curve (AUC) of hyperglycemic excursions above various thresholds (110, 120, 130, 140, and 180 mg/dL) was calculated. These AUC values, and results from a standard 50-g GCT, were correlated with our primary outcome of birth weight percentile, and secondary outcomes of unplanned operative delivery, pregnancy complications, delivery complications, fetal complications, and neonatal complications. A consistent correlation was seen between all AUC thresholds and birth weight percentile (r = 0.29, p < 0.05 for AUC-110, -120, -130, and -140; r = 0.25, p = 0.07 for AUC-180). This correlation was stronger than that of 1-hour oral GCT (r = -0.02, p = 0.88). There was no association between AUC values and other outcomes. Among nondiabetic pregnant patients, hyperglycemic excursions detected by CGM show a stronger correlation to birth weight percentile than blood glucose values obtained 1-hour after a 50-g oral GCT.

A predictor of small-for-gestational-age infant: oral glucose challenge test

This study was performed to investigate the role of first-hour 50-g oral glucose challenge test (GCT) parameters in predicting the risk of delivering a small-for-gestational-age infant and to determine the accuracy of estimated fetal weight. We screened 2,643 pregnant women >20 years of age and excluded 552 patients according to exclusion criteria. Newborns were assigned to three groups as SGA(n:100), AGA(n:100), and LGA(n:100) according to birth weight. All mothers received 50-g GCT in their 24-28th weeks of gestation. We examined the relationship between birthweight and test results. First-hour serum glucose level after the test significantly predicted babies with small for gestational age. Optimal cutoff value was obtained at a level of 74.5 mg/dl with 67% sensitivity and 55% specificity. The estimated fetal weight of Hadlock 5 formula was strongly correlated with the birth weight (Pearson r = 0.89). Our study revealed that 50-g oral glucose challenge test may predict small-for-gestational-age cases with 67% sensitivity, and our data revealed that there is a significant correlation between estimated fetal weight of Hadlock 5 formula and the birth weight.

Assessment of Periodontal Status in Association with Gestational Diabetes Mellitus: A Case-Control Study

Background: Few studies have specifically examined the relationship between periodontal disease and gestational diabetes mellitus (GDM). Type 1 or 2 diabetes increases the risk of developing periodontal disease, and periodontal disease may also increase the risk for type 2 diabetes. However, there is no study done so far in a Tamil population where the prevalence of Type II diabetes mellitus is >17%. The objective of this study was to examine whether maternal periodontal disease is associated with GDM in a Tamil urban population. Aim: The aims of the study were- To assess the periodontal status in patients with and without GDM To examine any association between maternal periodontal disease and GDM Materials and methods: The study population comprised of 90 patients, out of which 30 were cases & 60 were controls. All cases underwent a laboratory screening test for GDM between 24 to 30 weeks of gestation based on the recommendation of the Obstetricians and Gynaecologists. Women were screened for carbohydrate intolerance by performing a standard 1-hour, 50-g oral Glucose Challenge Test (GCT). If the glucose level was >135 mg/dl (GCT positive), then women were diagnosed with GDM and were considered as cases. Controls were defined as women who passed the GCT i.e glucose levels less than 135 mg/dl at 24 to 30 weeks and did not have any other types of diabetes. To assess the periodontal status, a full-mouth periodontal examination, assessing the probing depth, clinical attachment level, bleeding on probing and gingival recession was performed on all study participants, using the WHO periodontal probe by a single trained examiner. Tests for proportions and associations were performed by using chi-square statistics. To compare the means, student’s t-test was performed. Multiple logistic regression analysis was performed by incorporating other predictors like maternal age, BMI, hygiene score, family history of DM and gestational age apart from periodontitis. Results: The results showed that only age of the mother OR 1.387 (95% C I 1.129, 1.704), body mass index OR 1.190 (95% C I 1.029, 1.377), and family history of DM OR3.98 (95% C I 1.09, 14.49) were significant predictors of GDM. None of the periodontitis condition was found to be significant predictor of GDM. Conclusion: The study did not show any positive correlation between GDM & periodontal disease.

Factors predictive of macrosomia in pregnancies with a positive oral glucose challenge test: Importance of fasting plasma glucose

AimThe study aimed to determine the factors associated with fetal macrosomia following a positive oral glucose challenge test (OGCT). MethodsIn this retrospective single-centre study of 1268 pregnancies with positive 50-g OGCTs (plasma glucose≥130mg/dL, or 7.2mmol/L), gestational diabetes mellitus (GDM) was defined as fasting plasma glucose (FPG)≥95mg/dL (5.3mmol/L) and/or postprandial glucose (PPG)≥120mg/dL (6.7mmol/L). ResultsIn GDM pregnancies, the odds ratios adjusted for confounders (age, BMI, ethnicity, parity and weight gain) were 2.02 for macrosomia (Z score≥1.28) and 2.62 for severe macrosomia (Z score≥1.88). For each 10-mg/dL increase in FPG, the mean birth–weight increase was 60g. Macrosomia risk did not differ between GDM patients with normal FPG (<95mg/dL, or 5.3mmol/L) and non-diabetics, but increased significantly in cases of FPG≥95mg/dL and regardless of the level of PPG. ConclusionIn our study population, birth–weight and macrosomia risk were strongly correlated with FPG, suggesting that it is a simple and efficient marker for the risk of macrosomia.

Is Depression Associated With Glucose Tolerance Abnormality in Pregnant Women? A Cross-Sectonal Study

This study aims to examine the association between glucose tolerance abnormality and depression and anxiety in pregnant women. One hundred and sixty-seven women with gestational ages ranging from 24 to 28weeks were screened with the 50g oral glucose challenge test. All participants were assessed with the Beck Depression Inventory and the Beck Anxiety Inventory. The rate of depression was higher in women with abnormal glucose results (44.3%) than in women with normal glucose results (21.7%). Similarly, depressed women had higher glucose levels than non-depressed women. Findings suggest that depression and anxiety may be associated with glucose tolerance abnormality in pregnant women.

Screening Tests for Gestational Diabetes: A Systematic Review for the U.S. Preventive Services Task Force

A 50-g oral glucose challenge test (OGCT) is a widely accepted screening method for gestational diabetes mellitus (GDM), but other options are being considered. To systematically review the test characteristics of various screening methods for GDM across a range of recommended diagnostic glucose thresholds. 15 electronic databases from 1995 to May 2012, reference lists, Web sites of relevant organizations, and gray literature. Two reviewers independently identified English-language prospective studies that compared any screening test for GDM with any reference standard. One reviewer extracted and a second reviewer verified data from 51 cohort studies. Two reviewers independently assessed methodological quality. The sensitivity, specificity, and positive and negative likelihood ratios for the OGCT at a threshold of 7.8 mmol/L (140 mg/dL) were 70% to 88%, 69% to 89%, 2.6 to 6.5, and 0.16 to 0.33, respectively. At a threshold of 7.2 mmol/L (130 mg/dL), the test characteristics were 88% to 99%, 66% to 77%, 2.7 to 4.2, and 0.02 to 0.14, respectively. For a fasting plasma glucose threshold of 4.7 mmol/L (85 mg/dL), they were 87%, 52%, 1.8, and 0.25, respectively. Glycated hemoglobin level had poorer test characteristics than fasting plasma glucose level or the OGCT. No studies compared the OGCT with International Association of the Diabetes and Pregnancy Study Groups (IADPSG) diagnostic criteria. The lack of a gold standard for confirming GDM limits comparisons. Few data exist for screening tests before 24 weeks' gestation. The OGCT and fasting plasma glucose level (at a threshold of 4.7 mmol/L [85 mg/dL]) by 24 weeks' gestation are good at identifying women who do not have GDM. The OGCT is better at identifying women who have GDM. The OGCT has not been validated for the IADPSG diagnostic criteria.

Evaluation of oral glucose tolerance test, β-cell function and adverse obstetric outcomes

This study was conducted in order to investigate the prevalence of impaired glucose tolerance (IGT) and gestational diabetes mellitus (GDM), their effect on pregnancy and their association with adverse obstetric outcomes. A cross-sectional study was performed on 345 pregnant women, who were screened between the 24th and 28th gestational week with a 75-g oral glucose tolerance test following abnormal results at 1 h after a 50-g oral glucose challenge test. The obstetric outcomes were recorded along with plasma glucose and insulin levels, homeostasis model assessment of insulin resistance (HOMA-IR) and homeostasis model assessment of β-cell function index (HOMA-βCFI) and 50 subjects were excluded due to incomplete data recovery. Of the 295 pregnant women, 18.6% (55/295) were diagnosed with GDM and 32% (95/295) with IGT. The GDM group exhibited significantly higher fasting and 1-h blood glucose concentrations compared to the normal glucose tolerance (NGT) and IGT groups (P<0.01). The 2- and 3-h insulin values of the NGT group were significantly lower compared to those of the GDM group (P<0.05, P<0.01). In the IGT group, the 2-h insulin values were higher compared to the NGT group and the 3-h values were significantly higher (P<0.01), similar to the GDM group. There was a tendency for progressively decreased β-cell function and increased HOMA-IR from the NGT to the IGT to the GDM group. The adverse outcomes of pregnancy-induced hypertension, fetal distress, neonatal hyperbilirubinemia, preterm delivery, macrosomia and cesarean delivery indicated an association with HOMA-βCFI and HOMA-IR. In conclusion, these findings suggest a clinical significance of β-cell dysfunction in women with gestational IGT.

Insulin secretion and insulin resistance in Korean women with gestational diabetes mellitus and impaired glucose tolerance

Background/AimsThe aim was to compare the insulin sensitivity and secretion index of pregnant Korean women with normal glucose tolerance (NGT), gestational impaired glucose tolerance (GIGT; only one abnormal value according to the Carpenter and Coustan criteria), and gestational diabetes mellitus (GDM).MethodsA cross-sectional study was performed with 1,163 pregnant women with positive (1-hour plasma glucose ≥ 7.2 mmol/L) in a 50-g oral glucose challenge test (OGCT). The 100-g oral glucose tolerance test (OGTT) was used to stratify the participants into three groups: NGT (n = 588), GIGT (n = 294), and GDM (n = 281).ResultsThe GDM group had higher homeostasis model assessment of insulin resistance and lower insulin sensitivity index (ISOGTT), quantitative insulin sensitivity check index, homeostasis model assessment for estimation of index β-cell secretion (HOMA-B), first and second phase insulin secretion, and insulin secretion-sensitivity index (ISSI) than the NGT group (p ≤ 0.001 for all). Moreover, the GIGT group had lower ISOGTT, HOMA-B, first and second phase insulin secretion, and ISSI than the NGT group (p < 0.001 for all). Among the GIGT subjects, the 1-hour plasma glucose abnormal levels group showed significantly greater weight gain during pregnancy and higher values in the 50-g OGCT than the other two groups. Moreover, the 1-hour and 2-hour abnormal levels groups had poorer insulin secretion status than the 3-hour abnormal levels group.ConclusionsKorean women with GDM show impairments of both insulin secretion and insulin sensitivity. In addition, GIGT is associated with both β-cell dysfunction and insulin resistance.