Clinical and endocrine characteristics of the main polycystic ovary syndrome phenotypes.
Level 4 - case-series / case-control
Cross-sectional comparative study of clinical cases and healthy controls
PubMed 20303485 · doi:10.1016/j.fertnstert.2010.02.014
What was done
Researchers evaluated clinical and endocrine parameters across different Rotterdam-defined polycystic ovary syndrome (PCOS) phenotypes. The study included 382 consecutive women with PCOS and 85 ovulatory controls recruited at a university department of medicine. Measured parameters included gonadotropins (LH, FSH), total testosterone, sex hormone-binding globulin (SHBG), DHEAS, 17-hydroxyprogesterone, progesterone, fasting glucose, insulin, free androgen index (FAI), and insulin sensitivity indices.
What was found
Type I classic PCOS (hyperandrogenism, chronic anovulation, and polycystic ovaries) was the most common phenotype, occurring in 53.9% of patients. Type II classic PCOS (hyperandrogenism and chronic anovulation with normal ovaries) accounted for 8.9%; both classic phenotypes shared similar endocrine profiles, though patients with polycystic ovaries had higher LH/FSH ratios. Ovulatory PCOS comprised 28.8% of patients and exhibited milder clinical and endocrine abnormalities. The normoandrogenic phenotype was relatively uncommon and demonstrated normal BMI, normal insulin sensitivity, and normal FAI, but elevated LH and LH/FSH ratios.
Why it matters
These findings support the clinical stratification of PCOS, demonstrating that ovulatory PCOS represents a milder metabolic and hormonal variant of classic PCOS, whereas normoandrogenic PCOS exhibits a distinct endocrine profile that may reflect a separate underlying pathophysiology.
Limits
The abstract does not provide exact numerical values, confidence intervals, or p-values for hormone and metabolic measurements. The exact prevalence of the normoandrogenic phenotype is not explicitly quantified in the abstract. As a cross-sectional study conducted at a single university center, findings are subject to referral bias and cannot demonstrate longitudinal progression between phenotypes.
Cited by
- supports Women with PCOS and symptoms of elevated testosterone have a 70% to 80% chance of anovulation.