The Incidence of 21α-Hydroxylase Deficiency in Greek Hyperandrogenic Women: Screening and Diagnosis

Abstract

The purpose of this prospective study was to determine the incidence of any form of 21α.-hydroxylase deficiency among Greek women with hyperandrogenic symptoms, and to test the predictive value of basal serum 17-hydroxyprogesterone (17-OHP) in the early follicular phase as a screening index for patient preselection to adrenocorticotropic hormone (ACTH) testing. Eighty-eight unselected women with hyperandrogenic symptoms were examined in the Gynecological Endocrinology Unit of the Second Department of Obstetrics and Gynecology of Athens University. Using the ACTH-stimulated 17-OHP values at 60 minutes (17-OHP₆₀) the study population was divided into four groups (A, B, C and D). Clinical and basal hormonal parameters as well as serum 17-OHP₆₀ values and human leukocyte antigens were studied. Both clinical and basal hormonal parameters could be used to distinguish only patients with severe 21α-hydroxylase deficiency (group A). In contrast, patients with moderate non-classical congenital adrenal hyperplasia (NC-CAH; group B), heterozygotes for NC-CAH (group C), and unaffected females (group D) can be diagnosed and classified only by serum 17- OHP₆₀ values.

In conclusion, the incidence of NC-CAH in Greek females with hyperandrogenic symptoms is 3.4%. The positive predictive value of basal 17-OHP is only 13% for this disease. Only 17-OHP₆₀ helps to diagnose and classify moderate and mild forms of NC-CAH. Thus, it seems that ACTH testing is imperative in every subject suspected of this enzymatic disorder.

Key Words:

• 21α-Hydroxylase
• 17-Hydroxyprogesterone
• Nc-Cah
• Hla Antigens
• Hyperandrogenic Women
• Screening