Semen examinations were performed on 596 truly infertile men. The results obtained were compared with those of supposedly infertile men. Our findings indicate that the mean sperm count, mean total sperm per ejaculate, mean percentage motility and morphology of truly infertile males were far lower than past reports suggest. The type of male population studied was identified as the possible source of discrepancy. The data obtained further suggest that the realistic cutoff point between fertile and infertile semen should be a sperm concentration of 10 million/ml, a total sperm per ejaculate of 25 million, percentage motile and well-formed sperms of 40 and 60, respectively.
