Reproductive and perinatal outcomes in women with congenital adrenal hyperplasia - a population-based cohort study.

CONTEXT Reduced fertility has been reported for women with congenital adrenal hyperplasia (CAH), especially for those with the salt-losing form. However, data are sparse on reproductive and perinatal outcomes in these women. OBJECTIVE To investigate reproductive and perinatal outcomes in women with CAH. DESIGN AND SETTING Population-based and nationwide study using the National CAH Register, the Total Population Register and the Medical Birth Register of Sweden. PARTICIPANTS 272 women with CAH due to 21-hydroxylase deficiency and 27 200 controls matched by sex, age and place of birth. The median age was 31 years. MAIN OUTCOME MEASURES The proportion of CAH women that have given birth, reproductive and perinatal outcomes. RESULTS Of the 272 women with CAH, 69 gave birth to at least one child (25.4%), which was a lower frequency than for the controls (45.8%) (p<0.001). Furthermore, women with CAH had fewer children than controls and were slightly older at birth of their first child. More women with CAH were diagnosed with gestational diabetes than controls, 4.9% vs 1.4% (p<0.05), and more women with CAH were delivered through caesarean section, 51.4% vs 12.3% (p<0.05). There was no difference in Apgar score or frequency of small-for-gestational age between children born to mothers with CAH and controls. CONCLUSIONS This is, to our knowledge, the largest cohort designed to investigate reproductive and perinatal outcomes in women with CAH. We found the birth rate to be lower in women with CAH, gestational diabetes and caesarean section were more common, but perinatal outcomes were comparable to controls.