Positive Glucose Challenge Test Research Articles

Gestational diabetes and its correlation with maternal socio-demographic characteristics

Background and objective: Gestational diabetes mellitus is the most common metabolic disorder of pregnancy with increasing prevalence at epidemic rates. This study aimed to determine the prevalence of gestational diabetes mellitus and related risk factors in a sample of pregnant women in Erbil city. Methods: A cross-sectional study was conducted on a convenience sample of 216 pregnant women at primary health care centers in Erbil city, Kurdistan Region, Iraq, from April 2019 to January 2021. The pregnant women were selected independent of having or not having risk factors. Pregnant women were screened for diabetes mellitus using 50 gm glucose challenge test in 24–28th weeks of gestational age. Women with positive glucose challenge test underwent 100 g glucose tolerance test. Results: The 50g glucose challenge test revealed that 54 women (25.0%) were positive for gestational diabetes mellitus. Glucose tolerance test (100 gm) revealed that the prevalence of diabetes among the sample was 11.9%. The association between the different characteristics and risk factors with the diagnosed diabetic status of the study participants showed that there was a significant association with the older age, obesity, higher parity, and history of recurrent miscarriage. Conclusion: Pregnancy is associated with a high prevalence of gestational diabetes mellitus in the current research. Pregnant women, particularly those in advanced maternal age, with pre-pregnancy high body mass index and having a history of recurrent miscarriages, should be investigated for the possibility of the presence of gestational diabetes mellitus.

Importance of Blood Glucose Monitoring in Pregnant Females

Objective: To determine the frequency of gestational diabetes mellitus (GDM) among pregnant females. Study Design: Cross-sectional study. Place and Duration: Department of Gynecology and Obstetrics, and department of Pathology, Dow University of health sciences, From February 2021 to January 2022. Methodology: Five hundred pregnant ladies with gestational age between 24-28 weeks with any parity were included. These women were challenged with 75 grams of oral glucose solution and blood glucose levels were estimated at one-hour post-prandial. The cut-off limit was set to 140 mg/dl and women with more than this value were subjected to a 2 hr 75 grams oral glucose tolerance test to confirm the diagnosis of GDM. Results: Out of a total of 500 pregnant women, the mean age, gestational age and BMI were 26.4±4.3 years, 27.0±10.2 weeks and 27.6±4.3 kg/m2. There were 59 (11.8%) women who were found to have a positive glucose challenge test (GCT) while the remaining 441 (88.2%) had plasma glucose below 140 mg/dl. Furthermore, 59 OGTT results showed that 43 (8.6%) women had GDM. Women with GDM had significantly higher age (p<0.0001), higher BMI (p=0.0064) and multigravidity (0.0191) Practical Implications: Oral glucose challenge test can be administered in all pregnant women particularly in high risk individuals. Conclusion: The frequency of GDM was high. Pregnant ladies should be screened for GDM in time to prevent further complications during and after pregnancy. Keywords: Blood glucose, gestational diabetes mellitus, post-prandial.

Prediction of gestational diabetes mellitus in the first trimester: is it possible?

Objective: The aim of this study is to identify the first trimester markers that may be associated with gestational diabetes mellitus (GDM) and to evaluate whether those markers might be used for prediction of gestational diabetes or not. Methods: Pregnant women between 11 and 14 weeks of gestation applying to the university hospital between August 2018 and March 2019 were included in the study. Body mass index calculation and blood tests including complete blood count, TSH, T3, T4, HbA1c, uric acid, CRP, procalcitonin, PAPP-A and b-hCG levels were done during assessment followed by 50 grams of glucose challenge test between the 24 and 28 weeks of gestation for each woman. Patients with positive results were further evaluated with a 3-hour, 100-g OGTT. According to the diagnostic test results, the relationship between biochemical markers during the first trimester, BMI and GDM was statistically analyzed. Results: A hundred and eighty-two pregnant women participated in the study. Fifty-four women had positive glucose challenge test (GCT) results while 128 women had negative results. Pregnant women with positive GCT results underwent 3-hour, 100-g OGTT and, 24 pregnant women were diagnosed with GDM, while 158 pregnant women were considered healthy according to the results. There was no statistically significant difference between GDM and non-GDM groups in terms of age, height, TSH, T3, T4, b-hCG-mom, PAPP-A, PAPP-A-mom, uric acid and procalcitonin (p>0.05). The mean body weight, body mass index and HbA1c levels were higher and b-hCG levels were lower in the GDM group compared to the non-GDM group, and these findings were statistically significant (p<0.001). Conclusion: The use of first trimester markers in GDM prediction seems to have no significance. There is a need for extensive, randomized studies with universal criteria.

Timing of gestational diabetes diagnosis and pregnancy outcomes

Gestational diabetes mellitus (GDM) is commonly diagnosed via a two-step testing approach based on a screening one-hour glucose challenge test (GCT), followed by a diagnostic three-hour glucose tolerance test (GTT). Currently, there is no recommended timeframe in which to obtain a GTT following a positive GCT. The aim of this study was to examine the time interval between the GCT and GTT in patients with GDM and determine the impact on pregnancy and perinatal outcomes.

Association of leukocyte counts in the first trimester with glucose intolerance during pregnancy.

Aims/IntroductionWe investigated the association between leukocyte counts and glucose challenge test (GCT) level during pregnancy.Materials and MethodsWe collected prenatal information of women who had their first clinic visit in early pregnancy. Women underwent GCT at 24–28 gestational weeks, and a result of ≥7.8 mmol/L was considered positive. Participants were divided into quartiles of leukocyte counts, and association with GCT results and positive rate were analyzed by logistic regression.ResultsAmong 20,707 pregnant women, the median of leukocyte counts was higher in the positive group than the normal group (8.5 × 109/L vs 8.2 × 109/L, P < 0.01). There was a linear trend in GCT results and positive rate with increasing leukocyte quartiles. Compared with the lowest quartile, the highest leukocyte quartile (>9.70 × 109/L) was significantly associated with positive GCT results (adjusted odds ratio 1.378, 95% confidence interval 1.246–1.524), and the linear relationship between increased risk of positive result and increasing leukocyte quartiles persisted (P for linear trend <0.01). In multivariable analysis, the risk of a positive result increased by 2.2% with each 1‐unit increase in leukocyte counts (adjusted odds ratio 1.022, 95% confidence interval 1.011–1.033).ConclusionsElevated leukocyte counts in early pregnancy were independently and linearly associated with the risk of positive GCT levels, indicating that inflammation might play an important role in the development of gestational diabetes mellitus.

Association between false positive glucose challenge test results and large-for-gestational-age infants: a retrospective cohort study

ObjectivesThere is no consensus regarding a possible relation between false positive glucose challenge test (GCT) results and large-for-gestational-age (LGA) infants. This study aimed to clarify the association between false positive...

Implementing the 2013 WHO diagnostic criteria for gestational diabetes mellitus in a Rural Nigerian Population.

Introductionthe World Health Organization (WHO) reviewed the threshold values required for the diagnosis of Gestational Diabetes Mellitus (GDM) in 2013 and the implementation of the new diagnostic criteria have been associated with increase in the prevalence of GDM in some populations. The new cohort of pregnant women that will be labeled to have GDM by the 2013 WHO diagnostic criteria but not by the 1999 WHO diagnostic criteria will pose additional burden to specialized antenatal care, though their pregnancy outcome may not warrant such care. It is thus important to first determine the effect of the implementation of these new consensus diagnostic criteria on the prevalence of GDM in our environment.Methodsthis is a prospective hospital-based study that compared the implementation of both 1999 and 2013 WHO GDM diagnostic criteria among 117 pregnant women who were initially screened with 50-gram Glucose Challenge Test (50-g GCT). Women with a positive Glucose Challenge Test (GCT) result underwent a 75-gram Oral Glucose Tolerance Test (75-g OGTT), which was used as the actual diagnostic test for GDM using both 2013 WHO and 1999 WHO diagnostic criteria. Associations between variables were tested using Chi-square, Fisher's exact and t-test as appropriate. Significance level was set at P value < 0.05.Resultsthe prevalence rates of GDM in the study were 2.6% and 7.7% for 1999 WHO and 2013 WHO criteria respectively. Clinical characteristics were similar in women with GDM and women without GDM. The fasting component of the OGTT identified all the women with GDM.Conclusionthe implementation of the 2013 WHO diagnostic criteria is associated with a 2.5 to 3-fold rise in the prevalence of GDM. Selective risk-factor based screening may be clinically irrelevant with the adoption of the 2013 WHO diagnostic criteria. A minimum of fasting plasma glucose in resource poor settings can be considered to identify women with GDM since it appeared to have 100% sensitivity in our study.

Role of positive glucose challenge test only versus oral glucose tolerance test in pregnancy outcome: a comparative study

Background: Gestational diabetes mellitus is defined as any degree of glucose intolerance which is first recognized during pregnancy and is associated with a number of adverse perinatal outcomes, such as neonatal hypoglycemia, macrosomia with an increased risk of shoulder dystocia and the need for neonatal intensive care. Maternal complications include pre-eclampsia and an increased risk of caesarean delivery. The objective of this study was to compare maternal and perinatal outcomes in pregnant women with positive and negative oral glucose tolerance test following positive glucose challenge test.&#x0D; Materials and Methods: This is a prospective observational hospital based study of 120 patients admitted in Nobel Medical College Teaching Hospital, Biratnagar with glucose challenge test positive pregnancy for delivery. Oral glucose tolerance test was performed in all the glucose challenge test positive pregnant and compared with various maternal parameters and newborn’s conditions.&#x0D; Results: Among 120 patients included in the study, 28 (30.4%) cases were oral glucose tolerance test. Pregnancy induced hypertension was present in 12 cases. Hyperbilirubinemia was present in 42, hypoglycemia in 32, respiratory distress in 44, birth asphyxia in 15 and macrosomia in 6 cases.&#x0D; Conclusions: Pregnancy induced hypertension and hyperbilirubinemia were found to be significantly higher in OGTT positive cases so early detection of GDM screening via is advisable

Comparing Glucose Challenge Test Screening Thresholds in Obese and Overweight Gravidas

Given the paucity of contemporary data examining glucose challenge test (GCT), thresholds for gestational diabetes (GDM) screening in obese and overweight women, we sought to compare the sensitivity and testing characteristics of different screen positive GCT cut-offs in women with a prepregnancy body mass index (BMI) ≥ 25 kg/m2. This is a retrospective cohort study of obese and overweight women with singleton pregnancies who underwent GCT between 24 and 296/7 weeks and had a value between 130 and 199 mg/dL necessitating a 3-hour glucose tolerance test (GTT). Exclusion criteria were pregestational diabetes mellitus, multigestation, use of diabetes medications, and bariatric surgery. Between August 2015 and January 2016, 19% (n = 496) of women with a BMI ≥ 25 kg/m2 required a GTT to test for GDM, 27.8% (n = 138) of whom were diagnosed with GDM. Mean age was 30 years, mean BMI = 31.6 kg/m2, and 30.4% were Hispanic. The 130 mg/dL threshold compared with 140 mg/dL was more sensitive (absolute increase: 11.3%, 95% confidence interval [CI]: 6.7-17%), but less specific (absolute decrease: 6.4%, 95% CI: 5.5-7.5%). Shared decision making should be used to determine GCT cut-offs as some patients may prefer to undergo a GTT rather than miss a diagnosis of GDM.

Relationship between C-reactive Protein and Screening Test Results of Gestational Diabetes in Pregnant Women Referred to Health Centers in Isfahan in 2013-2014.

Background:Gestational diabetes is the second common disorder in pregnancy period, which is detected in 24–28 weeks of gestational age through screening tests. Low-grade systematic inflammation is associated with an increased risk of type 2 diabetes. C–Reactive Protein (CRP), an acute phase protein produced by hepatocytes, may be associated with diabetes. This study aimed to investigate serum levels of CRP in women with Gestational Diabetes Mellitus (GDM) and impaired glucose tolerance test compared with control subjects.Materials and Methods:This observational longitudinal study was conducted on 176 pregnant women in Isfahan. After administration of a CRP test in these women in the first trimester, a screening test of Glucose Challenge Test (GCT) with 50-g oral glucose was conducted in 24–28 weeks of gestational age. Then, CRP levels and GCT were compared.Results:Serum CRP levels were not significantly correlated with positive GCT among the women. In GDM patients, there was not a significant correlation between CRP and BMI.Conclusions:There was no significant correlation between maternal serum CRP level and gestational diabetes. Maternal serum CRP level in the first trimester cannot predict Intolerance Glucose Test (IGT) in 26–30 weeks of gestational age.

Relationship between 50-g glucose challenge test and large for gestational age infants among pregnant women without gestational diabetes

The study aimed to compare the incidence of large for gestational age (LGA) infants between women with a false positive and normal glucose challenge test (GCT), and to evaluate the factors associated with LGA. A total of 480 pregnant women at risk for gestational diabetes mellitus (GDM); 160 with a false positive GCT and 320 with normal GCT results were included. The incidence of LGA and other pregnancy outcomes were compared between the two groups. Possible associated factors for LGA were also evaluated. Women with a false positive GCT were significantly older and more likely to be multiparous. The incidence of LGA was comparable between the false positive and normal GCT groups (15.6% vs. 13.1%, p = .456). Other pregnancy outcomes were also comparable. Logistic regression analysis showed that pre-pregnancy underweight significantly reduced the risk of LGA (adjusted OR 0.25, 95% CI 0.07–0.87, p = .029) while a second trimester weight gain >7 kg significantly increased the risk of LGA (adjusted OR 3.13, 95% CI 1.67–5.89, p < .001).Impact StatementWhat is already known on this subject? Women with a false-positive GCT (abnormal GCT but normal OGTT) can be considered as having an early form of glucose intolerance which similar adverse outcomes to GDM could develop. Previous studies have reported that a mild maternal hyperglycaemia in the absence of GDM is associated with LGA, macrosomia, shoulder dystocia and a caesarean delivery. There is no current recommendation for any intervention or treatment among women with a false positive GCT.What the results of this study add? The results of this study showed that an incidence of LGA was not significantly increased in the false positive GCT groups and that other pregnancy outcomes were comparable. A pre-pregnancy underweight significantly reduced the risk of LGA while a second trimester weight gain >7 kg significantly increased the risk of LGA.What the implications are of these findings for clinical practice and/or further research? As a gestational weight gain is modifiable, behavioural and a dietary intervention as well as a close monitoring of the weight gain could help in lowering the risk of LGA, even in the absence of GDM. Further studies which are more widely generalisable are needed to elucidate the relationship between 50 g GCT and the adverse outcomes and to investigate the benefits of a specific intervention among this specific group of women.

Gestational diabetes and offspring’s growth from birth to 6 years old

The objective of this study was to compare the children's body mass index (BMI) growth between offspring exposed to maternal gestational diabetes mellitus (GDM) and those not exposed, and assess the associations between maternal hyperglycemia and their offspring's overweight risk from 1 to 6 years of age. Using the healthcare records data from the Tianjin Maternal and Child Healthcare System, we conducted a population-based cohort study, which is composed of 27,155 mother-child pairs with all mothers undergoing GDM screening test in pregnancy. After adjustment for maternal and children's characteristics, children born to mothers with abnormal glucose (including GDM or abnormal glucose challenge test (GCT) but normal oral glucose tolerance test (OGTT) results) during pregnancy had higher mean values of Z-scores for BMI for age at 1, 2, 3, 5, and 6 years of age, in comparison with those born to mothers with normal glucose (all P values < 0.05). Moreover, maternal abnormal glucose was associated with a higher risk of childhood overweight with multivariate-adjusted hazard ratios of 1.07 (95% confidence interval (CI) 1.01-1.14), 1.09 (95% CI 1.04-1.15), 1.10 (95% CI 1.04-1.15), 1.08 (95% CI 1.03-1.14), 1.08 (95% 1.03-1.13), and 1.07 (95% 1.02-1.12) at 1-6 years of age compared with children of mothers with normal glucose. Abnormal maternal glucose tolerance during pregnancy was independently associated with children's higher BMI and overweight risk from 1 to 6 years of age. Women with positive GCT results but negative OGTT can be neglected by the health system. More attention should be paid to the health of these mothers and their offspring.

Excessive Gestational Weight Gain in Women With Positive Glucose Challenge Test is Associated with Adverse Outcomes [38F

INTRODUCTION: The Institute of Medicine (IOM) guidelines currently recommends targeting gestational weight gain (GWG) according to pre-pregnancy BMI. We compared the maternal and neonatal outcomes in women with a positive glucose challenge test (GCT) who gained weight in excess of the IOM guidelines to those who were adherent. METHODS: A retrospective single-center cohort study including all singleton, term (&gt;37 weeks) pregnancies with a positive GCT (&gt;140mg/dl) delivered between 2013-2016. Patients were classified as either ‘excess’ or ‘adherent’ based on IOM GWG recommendations. Primary outcome was the rate of macrosomia (&gt;4,000g). Secondary outcomes included rates of cesarean delivery and neonatal hypoglycemia. Baseline variables were compared using t-test or chi-square test and combined in a multivariable logistic regression model. RESULTS: From 456 singleton-term pregnancies, 182 patients (40%) had ‘excess’ GWG. The excess cohort were younger, more likely to be African-American and have positive screening GCT with a negative diagnostic test (71% vs 58%,p&lt;0.01). Excess cohort had greater rate of macrosomia (15% vs 5%,p&lt;0.01), more likely to develop pre-eclampsia (10% vs 2%,p&lt;0.01) and undergo cesarean delivery (40% vs 32%,p=0.10). The increased risk of macrosomia (OR-3.45, 95%CI 1.7-7.5) and pre-eclampsia (OR-4.8, 95%CI 1.8-15.4) remained when adjusting for age, ethnicity, and pre-pregnancy BMI. Rates of neonatal hypoglycemia were similar in both cohorts. CONCLUSION: Women with a positive GCT, regardless of the diagnosis of gestational diabetes, gaining weight in excess of IOM guidelines have increased risk of macrosomia and pre-eclampsia. Focused counseling regarding appropriate weight gain should be considered in all women with a positive GCT.

Maternal Subcutaneous and Visceral Adipose Ultrasound Thickness in Women with Gestational Diabetes Mellitus at 24-28 Weeks' Gestation

Objective: To compare the sonographic measurement of maternal subcutaneous and visceral adipose thickness between pregnant women with gestational diabetes mellitus (GDM) and patients with nondiabetic pregnancies. Methods: Adipose thickness was measured by transabdominal ultrasound in pregnant women attending our antenatal clinics at 24-28 weeks' gestation. All patients underwent a 75-g oral glucose challenge as a diagnostic test for GDM. Results: The study population comprised 56 women with a positive glucose challenge test and 112 nondiabetic pregnancies. Measurements of subcutaneous and visceral adipose tissues were converted into multiples of the median (MoM), adjusted for gestational age. The mean subcutaneous thickness MoM in patients with GDM was significantly higher compared to nondiabetic pregnancies (1.31 vs. 1.07; p = 0.011). Similarly, the mean visceral thickness MoM was higher in women with a positive oral glucose tolerance test compared to controls (1.61 vs. 1.06; p < 0.001). Multivariate logistic regression analysis demonstrated that visceral adipose thickness, but not subcutaneous thickness, was significantly and independently associated with GDM (odds ratio 34.047, 95% confidence interval 9.489-122.166). Conclusions: Sonographic thickness of maternal visceral adipose tissue at 24-28 weeks' gestation was higher in women with GDM compared to nondiabetic pregnancies, independently from other known risk factors associated with GDM.

Clinical significance of a false positive glucose challenge test in patients with a high body mass index.

To determine if there is an increased maternal or neonatal morbidity in overweight and obese patients with a false positive glucose challenge test (GCT). Patients with a body mass index (BMI) ≥25.0 at registration were included in this prospective 36-month study. The study cohort consisted of patients with a false positive (FP) GCT, with two comparison cohorts: those with a (1) screen negative (SN) GCT result and (2) true positive (TP) GCT result. Risks were reported as odd ratios with 95% confidence intervals, with a P<0.05 considered as significant. There were 60 patients in the FP cohort, 106 in the SN cohort, and 64 in the TP cohort. When the BMI of the FP cohort was compared with either the SN cohort or TP cohort, differences were non-significant (SN 32.3 vs. FP 33.3 kg/m2, P=0.067) and (FP 33.3 vs. TP 34.4 kg/m2, P=0.303). When comparing the FP cohort to the SN cohort, patients in the FP group had significantly more gestational hypertension and pre-eclampsia. There was a trend towards delivering large for gestational weight infants and an infant ≥4000 g in the FP cohort, but this fell short of reaching statistical significance. When comparing the FP to TP cohorts, rates of gestational hypertension, pre-eclampsia, and infants ≥4000 g were similar; however, neonatal morbidity was increased in the TP group. Overweight and obese patients with a FP glucose challenge screen are more likely to have adverse maternal outcomes. Neonatal morbidity was not increased.

How high is too high in cutoff levels from 50-g glucose challenge test

ObjectiveTo determine the highest 50-g glucose challenge test (GCT) value that indicates no further diagnostic test is needed to confirm a diagnosis of gestational diabetes mellitus (GDM) under the criteria of National Diabetes Data Group (NDDG) or the Carpenter and Coustan (C&C) and fasting glucose thresholds from the International Association of Diabetes and Pregnancy Study Group (IADPSG).MethodsWe collected the 50-g GCT results from 16,560 pregnancies and identified 2,457 gravidas with positive 50-g GCT (≥130 mg/dL) values who underwent the 100-g glucose tolerance test. We investigated GDM prevalence in pregnancies with positive 50-g GCT according to the respective diagnostic thresholds and determined the 50-g GCT cutoff values with 100% positive predictive value for GDM under each diagnostic threshold.ResultsTwelve point five percent (306/2,457), 20.0% (492/2,457), and 9.6% (235/2,457) met the diagnostic criteria of GDM with the application of NDDG, C&C criteria, and fasting glucose thresholds from IADPSG (≥92 mg/dL), respectively. We also found that the prevalence of GDM increased with increasing 50-g GCT values using each diagnostic criterion. Importantly, we identified that all subjects with a 50-g GCT value ≥223, ≥217, or ≥228 mg/dL can be exclusively diagnosed as having gestational diabetes according to the criteria of NDDG, C&C, and fasting glucose thresholds from IADPSG, respectively.ConclusionWe propose that women with a 50-g GCT screening value ≥228 mg/dL can be reliably omitted from further confirmative tests for GDM, such as 100- or 75-g glucose tolerance test.

Does gestational diabetes affect fetal growth and pregnancy outcome in twin pregnancies?

Women with twin pregnancies are at increased risk for fetal growth restriction, which might be attributed to the limited maternal resources that are being shared by >1 fetus. Based on that, it may be hypothesized that the fetal effects of gestational diabetes mellitus (GDM) with respect to accelerated fetal growth may be less pronounced in twin gestations or alternatively may even have a beneficial role in decreasing the risk of fetal growth restriction in these pregnancies. However, available data are conflicting and are limited by the fact that many of the complications associated with GDM are less relevant for twin gestations, and that all women with GDM included in previous studies were monitored and treated to control maternal blood glucose levels. We sought to assess the impact of GDM and milder degrees of glucose intolerance on fetal growth and pregnancy outcome in twin pregnancies. This was a retrospective cohort study of all women with twin pregnancies who underwent screening for GDM in a single tertiary referral center from October 2003 through December 2014. The diagnosis of GDM during the study period was based on the 2008 Canadian Diabetes Association (CDA) guidelines, which involve universal screening with a 50-g glucose challenge test (GCT) followed by a diagnostic 2-hour 75-g oral glucose tolerance test (OGTT). Fetal growth and pregnancy outcome were compared among 4 groups of women with increasing degree of glucose intolerance: (1) GCT-NEGATIVE, negative 50-g GCT; (2) OGTT-NEGATIVE, positive 50-g GCT followed by a negative 75-g OGTT; (3) GDM-IADPSG, positive 50-g GCT followed by a positive 75-g OGTT according to the International Association of the Diabetes and Pregnancy Study Groups (IADPSG) criteria but not the 2008 CDA criteria-because these women were not considered to have GDM during the study period they were not subjected to any form of treatment; and (4)GDM-CDA, positive 50-g GCT followed by a positive 75-g OGTT according to the 2008 CDA criteria. Overall 1393 women were eligible for the study: 1021 (73.3%) in the GCT-NEGATIVE group, 184 (13.2%) in the OGTT-NEGATIVE group, 99 (7.1%) in the GDM-IADPSG group, and 89 (6.4%) in the GDM-CDA group. There was a continuous relationship between the degree of glucose intolerance and fetal growth as reflected by a right shift of the distribution curve of birthweight percentiles and a greater likelihood of high birthweight percentile: OGTT-NEGATIVE= odds ratio (OR), 1.5; 95% confidence interval (CI), 1.07-2.2; GDM-IADPSG= OR, 1.7; 95% CI, 1.1-2.6; and GDM-CDA= OR, 1.9, 95% CI, 1.3-3.1 (using the GCT-NEGATIVE group as reference). Fetuses of women with glucose intolerance were more likely to experience asymmetric growth as reflected by an elevated abdominal circumference to head circumference ratio. GDM and milder degrees of glucose intolerance in twinpregnancies are associated with an increased risk of asymmetric overgrowth in a manner that is related to the degree of glucose intolerance.

Influence of medical nutrition therapy on borderline glucose intolerance in pregnant Taiwanese women

Objective: To investigate the influence of medical nutrition therapy (MNT) on borderline glucose intolerance (BGI) in pregnant Taiwanese women.Methods: A total of 5194 singleton pregnant women were enrolled in this prospective, non-randomized study. The participants were subjected to the 50 g 1-h glucose challenge test (GCT) and 100 g 3-h oral glucose tolerance test (OGTT) to screening gestational diabetes mellitus (GDM). BGI was defined as a positive GCT and normal OGTT results. GDM was defined as a positive GCT and abnormal OGTT results. The women were categorized into the following groups: (1) GCT-negative, n = 3881; (2) BGI with MNT, n = 273; (3) BGI without MNT, n = 712; and (4) GDM, n = 328. Multiple logistic analyses were used to estimate the risks of pregnancy outcomes.Results: The odds ratios (95% confidence interval) for total cesareans, third- or fourth-degree perineal lacerations, gestational hypertension or preeclampsia and macrosomia were 1.24 (1.04–1.49), 1.55 (1.06–1.28), 1.78 (1.21–2.61) and 2.50 (1.28–4.91) in the BGI without MNT group compared to the GCT-negative group. There was no difference between BGI with MNT and GCT-negative groups.Conclusions: Women with BGI who did not receive MNT had increased risks of adverse pregnancy outcomes, whereas who received MNT had no different risk with GCT-negative women.

Can either oral glucose challenge test or oral glucose tolerance test parameters predict gestational diabetes mellitus?

This study aims to evaluate the relationship between the glucose challenge test (GCT) levels and any of the oral glucose tolerance test (OGTT) parameters (fasting plasma glucose (FPG), 1-, 2-, or 3-h plasma glucose levels) and their effect on predicting gestational diabetes mellitus (GDM). This analysis was carried out as a retrospective study at Obstetrics and Gynecology Clinic of Turgut Ozal University Hospital. Oral GCT were conducted on patients who are at 24–29 weeks’ gestation. The study participants with positive GCT results underwent a 3-h, 100-g OGTT, and the resulting values were evaluated using Carpenter and Coustan diagnostic criteria to determine the gestational glucose tolerance status of patients. The data obtained from both tests (GCT, FPG, 1-, 2-, 3-h OGTT values) were analyzed to observe the effect of each group on predicting GDM. Although all of the GCT and OGTT values were found to be statistically significant (p < 0.001) in determining GDM, the 2-h values of OGTT detected almost all GDM cases with a very high sensitivity level (94.5 %). The 1-h values on the other hand identified 87.6 % of GDM (p < 0.001). The GCT value with the highest sensitivity and specificity for predicting GDM was calculated as 154.50 mg/dl (sensitivity and specificity rates were 79.2 and 72.8 %, respectively). A 2-h OGTT glucose level can detect GDM with 94.5 % sensitivity. This result can guide clinicians to evaluate the patients with GDM.

Prevalence of gestational diabetes mellitus and its risk factors in Chinese pregnant women: a prospective population-based study in Tianjin, China.

ObjectiveWe compared the increases in the prevalence of gestational diabetes mellitus (GDM) based on the 1999 World Health Organization (WHO) criteria and its risk factors in Tianjin, China, over a 12-year period. We also examined the changes in the prevalence using the criteria of International Association of Diabetes and Pregnancy Study Group (IADPSG).MethodsIn 2010-2012, 18589 women who registered within 12 weeks of gestation underwent a glucose challenge test (GCT) at 24-28 gestational weeks. Amongst them, 2953 women with 1-hour plasma glucose ≥7.8 mmol/L underwent a 75-gram 2-hour oral glucose tolerance test (OGTT) and 781 women had a positive GCT but absented from the standard OGTT. An adjusted prevalence of GDM was calculated for the whole cohort of women by including an estimate of the proportion of women with positive GCTs who did not have OGTTs but would have been expected to have GDM. Logistic regression was used to obtain odds ratios and 95% confidence intervals using the IADPSG criteria. The prevalence of GDM risk factors was compared to the 1999 survey.ResultsThe adjusted prevalence of GDM by the 1999 WHO criteria was 8.1%, a 3.5-fold increase as in 1999. Using the IADPSG criteria increased the adjusted prevalence further to 9.3%. Advanced age, higher pre-pregnancy body mass index, Han-nationality, higher systolic blood pressure (BP), a family history of diabetes, weight gain during pregnancy and habitual smoking were risk factors for GDM. Compared to the 1999 survey, the prevalence of overweight plus obesity had increased by 1.8 folds, age≥30 years by 2.3 folds, systolic BP by 2.3 mmHg over the 12-year period.ConclusionsIncreasing prevalence of overweight/obesity and older age at pregnancy were accompanied by increasing prevalence of GDM, further increased by change in diagnostic criteria.