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Six normal men were injected with 4000 i.u. of hcg intramuscularly three times a week for 6 weeks or every 2nd day for 16 weeks. Levels of urinary testosterone and oestrogens were measured. Leydig cells were quantified on the basis of the Leydig cell/Sertoli cell ratio, and Leydig-cell size was measured. Following both 6 and 16 weeks hcg administration, four subjects showed no change in Leydig-cell numbers. The remaining subjects showed slight increases or decreases. Levels of urinary testosterone and oestrogen increased. It is concluded that there is no consistent increase in Leydig-cell numbers following hcg administration. Measurements of Leydig-cell nucleus and cytoplasm revealed a significant increase in the size of both at 6 and 16 weeks in all but one subject. It is concluded that the increased activity of the Leydig cells is related to their increase in size and not to an increase in number as had been reported.

QUANTIFICATION OF LEYDIG CELLS AND MEASUREMENT OF LEYDIG-CELL SIZE FOLLOWING ADMINISTRATION OF HUMAN CHORIONIC GONADOTROPHIN TO NORMAL MEN