Seminal fructose in normal and infertile men.

Fructose levels and fructolysis index in human semen were analysed to assess a correlation, if any, between the levels of this glycolysable sugar and sperm concentration. Semen was collected from normospermic men and men with azoospermia or oligospermia. Seminal fructose levels were elevated in men with obstructive azoospermia and in men who remained azoospermic following vasoepididy mostomy done to correct epididymal blockage. Men with sperm concentration of less than 20 million/ml pre-operatively or following vasoepididy mostomy, showed significantly high levels of fructose and lower fructolysis index. Fructose levels in normospermic infertile men, as well as in men with normal sperm counts (more than 20 million/ml), were similar to that in men of proven fertility.