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Seminal fluid transferrin concentrations of proven fertile donors and normozoospermic patients were significantly higher (P less than 0.001) than those in other groups examined. There were no significant differences in the transferrin values among vasectomized, azoospermic and very severe oligozoospermic subjects. Values were also similar in patients affected by secretory or excretory azoospermia. Regression analysis showed a positive correlation (P less than 0.001, r = 0.72) between seminal fluid transferrin concentrations and sperm density. A negative correlation (P less than 0.02, r = 0.28) existed between circulating FSH and seminal fluid transferrin concentrations. There were no significant differences between seminal fluid transferrin and the percentages of abnormal sperm cells or immature seminal line elements. These results indicate that the nature of seminiferous tubule dysfunction can be precisely defined by examining seminal fluid transferrin in combination with other biological values usually used to explore testicular function.

Seminal fluid transferrin as an index of gonadal function in men