A study of pregnancy rates in "cleared" male factor couples.

BACKGROUND

Among couples with male factor infertility, the natural pregnancy rates associated with classic male factor treatments are well described. In couples with unexplained infertility, the proportion due to occult male factor is unclear. We hypothesized that many men diagnosed with unexplained infertility are actually fertile. We describe the 1-year natural pregnancy rates among couples in whom the male partner has been "cleared" of infertility on urologic evaluation.

METHODS

Consecutive infertile couples were recruited from a single practice (PJT) over a 3-year period. A thorough male factor evaluation was performed, including a history, physical examination and 2 semen analyses. Based on this assessment, male partners in whom bulk semen parameters were normal were "cleared" from further evaluation. Lifestyle modifications were allowed, but no medical or surgical treatments were offered. The presence or absence of a female factor evaluation was not required for study inclusion. Subjects were followed for 12 months or until a pregnancy was achieved. Subjects were contacted via telesurvery 1-year later and pregnancy status ascertained. Simple descriptive statistics were used to evaluate the significance of observations.

RESULTS

Fifty-four men were enrolled in the study. The mean duration of infertility was 1.5 years (range, 0.4 to 4.0 years) and the mean male and female partner ages were 38.6 and 35.1 years, respectively. On evaluation, 40% of men were noted to have significant fertility risks that included a clinical varicocele, exposures, and androgen altering medications. Among n=31 couples with known pregnancy outcomes, 20/31 (65%) conceived naturally at a mean of 9 months after evaluation (range, 3-30 mos). Another 1/31 (3%) couples conceived with intrauterine insemination (IUI) and 4/31 (13%) conceived with IVF-ICSI.

CONCLUSIONS

A significant proportion of men diagnosed with unexplained infertility have lifestyle risk factors on urologic evaluation. Care in the form of counseling at-risk patients regarding lifestyle issues, in the absence of formal treatment, may have value in improving the fertility potential in this population. Indeed, natural conception rates among men identified with unexplained infertility are substantial and suggest that many of these men are truly fertile.