OBJECTIVE: To investigate the effects of oral natural micronized P on hormonal and metabolic parameters in patients with polycystic ovary syndrome (PCOS) and to answer the clinical question whether induction of withdrawal bleeding is a necessity for the comparison of hormonal and metabolic data in subjects with PCOS. DESIGN: Prospective clinical study. SETTING: Academic medical center. PATIENT(S): Twenty-eight reproductive-aged women with PCOS. MAIN OUTCOME MEASURE(S): Blood sampling was collected at baseline, after 7 days of oral natural micronized P (200 mg) administration, and after withdrawal bleeding. At these three stages hormonal parameters and homeostasis assessment model (HOMA-IR) index were assessed in all patients. RESULT(S): Oral natural micronized P administration did not alter significantly insulin sensitivity index and androgen levels; however, LH was decreased when postbleeding values were compared to baseline. Nevertheless, after oral natural micronized P administration, P and 17alpha-hydroxyprogesterone (17-OHP) concentrations were increased, and HOMA-IR was decreased, whereas androgens levels were not altered, in comparison with baseline. CONCLUSION(S): The induction of withdrawal bleeding, with this regimen, does not appear to be a necessity for the assessment of hormonal and metabolic profile in anovulatory women with PCOS. Crown Copyright (c) 2010. Published by Elsevier Inc. All rights reserved.
OBJECTIVE: To investigate the effects of oral natural micronized P on hormonal and metabolic parameters in patients with polycystic ovary syndrome (PCOS) and to answer the clinical question whether induction of withdrawal bleeding is a necessity for the comparison of hormonal and metabolic data in subjects with PCOS. DESIGN: Prospective clinical study. SETTING: Academic medical center. PATIENT(S): Twenty-eight reproductive-aged women with PCOS. MAIN OUTCOME MEASURE(S): Blood sampling was collected at baseline, after 7 days of oral natural micronized P (200 mg) administration, and after withdrawal bleeding. At these three stages hormonal parameters and homeostasis assessment model (HOMA-IR) index were assessed in all patients. RESULT(S): Oral natural micronized P administration did not alter significantly insulin sensitivity index and androgen levels; however, LH was decreased when postbleeding values were compared to baseline. Nevertheless, after oral natural micronized P administration, P and 17alpha-hydroxyprogesterone (17-OHP) concentrations were increased, and HOMA-IR was decreased, whereas androgens levels were not altered, in comparison with baseline. CONCLUSION(S): The induction of withdrawal bleeding, with this regimen, does not appear to be a necessity for the assessment of hormonal and metabolic profile in anovulatory women with PCOS. Crown Copyright (c) 2010. Published by Elsevier Inc. All rights reserved.