7/9/2011 blood test (3 months post finasteride)
LH 4.1
FSH 1.6
testosterone 856 (249-836 ng/dL)
free t, direct 13.0 (8.7-25.1 pg/mL)
SHBG 77.5 (14.5-48.4 nmol/L)
estradiol 37.0 (7.6-42.6 pg/mL)
estrone 45 (12-72 pg/mL)
letter from my endo dated july 2011
It would probably be worth having liver function tests done to be sure the high SHBG is not one manifestation of a more general problem with hyperglobulinemia due to hepatitis or chronic liver disease, but that explanation for the high SHBG seems highly unlikely. My previous speculation, that high estrogens might have explained the elevation of SHBG, was not supported by the current studies. There may be a relatively long timeframe for changes to be seen in the levels of circulation globulins, after revision of any influence that had been formerly exerting an effect upon their levels. A possibility is that we still could be seeing lingering effects from estrogen elevations of the past; the present estradiol level is in the high end of the normal range. However, given that estrogen elevation is not a recognized complication of treatment with Propecia, I now think the likeliest explanation might be that SHBG levels could be affected by the ratio of dihydrotestosterone to estrogen, such that a low ratio induces SHBG levels to be elevated. Once SHBG is elevated, the total testosterone is elevated, but not the free testosterone. With the passage of time, if there has been a temporary effect of this type, the effect should regress. Although I have tried to research these questions, I'm not finding clearcut answers. If I hear from you with your permission, I might like to share the de-identified data with an expert in the field of andrology or sex steroid metabolism. If you should learn anything further from your contacts who have similar concern, I would be interested to hear of your findings. (she means the hairloss community).