...Twenty-nine men with normal
reproductive physiology were randomized to receive 200
mg T enanthate weekly in combination with either saline placebo
or 125, 250, or 500 IU hCG every other day for 3 wk.....
Baseline serum T (14.1 nmol/liter) was 1.2% of ITT (1174 nmol/
liter). LH and FSH were profoundly suppressed to 5% and 3% of
baseline, respectively, and ITT was suppressed by 94% (1234 to
72 nmol/liter) in the T enanthate/placebo group. ITT increased
linearly with increasing hCG dose (P < 0.001). Posttreatment
ITT was 25% less than baseline in the 125 IU hCG group, 7% less
than baseline in the 250 IU hCG group, and 26% greater than
baseline in the 500 IU hCG group. These results demonstrate
that relatively low dose hCG maintains ITT within the normal
range in healthy men with gonadotropin suppression