From the recent conference of the American Urological Association:
The study focused on 200 men in a cardiology practice who completed the IIEF-15, ADAM, and previous ED treatment questionnaires. Additionally all patients had serum total testosterone (T), estradiol (E), and sex hormone binding globulin (SHBG) levels measured via morning lab draws. Their free testosterone (CFT) was calculated using an online ISSM calculator. CFT and T:E ratio were predictive of positive libido response on IIEF11 & 12 questions in the IIEF questionnaire. Estradiol, even at a cutoff of 5 ng/dL, was not independently associated with improved libido. Surprisingly, no correlation was found between total testosterone and IIEF11 (desire frequency).
The study focused on 200 men in a cardiology practice who completed the IIEF-15, ADAM, and previous ED treatment questionnaires. Additionally all patients had serum total testosterone (T), estradiol (E), and sex hormone binding globulin (SHBG) levels measured via morning lab draws. Their free testosterone (CFT) was calculated using an online ISSM calculator. CFT and T:E ratio were predictive of positive libido response on IIEF11 & 12 questions in the IIEF questionnaire. Estradiol, even at a cutoff of 5 ng/dL, was not independently associated with improved libido. Surprisingly, no correlation was found between total testosterone and IIEF11 (desire frequency).
