Proportion of Newly Detected Hypothyroidism among the Diabetic and Nondiabetic Pregnant Ladies and Correlation of Different Parameters with Thyroid Stimulatory Hormone in Pregnancy Attending a Tertiary Care Hospital

Abstract

ABSTRACT Background: Subclinical hypothyroidism and gestational diabetes are the two most common endocrinopathy encountered in daily clinical practice. Many literature showed a higher frequency of hypothyroidism in the persons with diabetes but others did not find it. Objectives: The study was intended to compare the proportion of newly detected hypothyroidism in persons with diabetes and without diabetes in pregnancy (DIP). Materials and Methods: This cross-sectional, observational study enrolled 175 pregnant women by convenient sampling from the Department of Obstetrics and Gynecology, BIRDEM General Hospital, with or without diabetes after IRB clearance. According to the study protocol, Thyroid function test (TFT) and oral glucose tolerance test were done in the participants. Thyroid stimulatory hormone (TSH), free thyroxin, and antithyroid antibodies were tested using the chemiluminescent technique by the ADVIA centaur, Siemens. Plasma glucose was analyzed by Advia-1800, SIEMENS, USA by glucose oxidase method. Data were analyzed by SPSS version 25. Nonparametric tests were chosen for statistical analysis. Results: The median maternal age was 30 years, and half of the participants had a family history of diabetes mellitus (DM). Hundred patients had diabetes either gestational DM or DIP or preexisting diabetes. Among the persons with diabetes, 34% had hypothyroidism, and in euglycemic patients, 29.3% had hypothyroidism. There was no statistically significant (P = 0.785) difference in the median values of TSH across the glycemic status among the hypothyroid subjects. TSH had a positive correlation with thyroid peroxidase antibody (P = 0.174) within the hypothyroid patients. In the study subjects, TSH was inversely correlated with hemoglobin (P < 0.001). Conclusions: There is no statistically significant concordance in diagnosing hypothyroidism in pregnancy between the persons with diabetes and without diabetes.