Abstract
The hypoosmotic swelling (HOS) test was evaluated in 40 men whose wives had no apparent fertility factors. Only one of 29 men with normal semen parameters had a surbnormal HOS test, and that couple failed to conceive compared to 27 of 28 with normal HOS test who did conceive. All five couples with husbands with subnormal semen parameters but with normal HOS tests achieved a pregnancy, but none of the three with abnormal HOS tests achieved a pregnancy. The results suggest that the HOS test might be of value in predicting which couples should be more patient despite low semen parameters.
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