['To evaluate the association between insulin/insulin-like growth factor I (IGF-I) systems and androgen levels in pregnancy.', 'Prospective cohort study.', 'Yale University School of Medicine.', 'Pregnant women undergoing a 100-gram 3-hour glucose tolerance test (GTT).', 'Serum samples collected during GTT were analyzed for insulin, androgens, free IGF-I, insulin-like growth factor-binding protein (IGFBP) 1, and estriol.', 'Observing the relationship between insulin/IGFs and androgen levels.', 'The insulin area under the curve (I(AUC)) during GTT correlated positively with total T and free T, but not with dehydroepiandrosterone (DHEA), dehydroepiandrosterone sulphate (DHEAS), or estriol. The peak insulin values (I(max)) during GTT also correlated positively with total T and free T, but not with DHEA, DHEAS, or estriol. There was no statistically significant correlation of T levels with free IGF-I, IGFBP-1, glucose, DHEAS, or estriol. Multiple linear regression analysis modeling showed that I(AUC) and I(max) did have a statistically significant correlation with free T levels.'] Do testosterone levels in pregnant women correlate with the insulin response during the glucose tolerance test?