International Journal of Fertility. After seven to twenty hours, the number of sperm penetrations per egg is measured. From Wikipedia, the free encyclopedia. Results suggest that men whose sperm fail the hamster test are a third as fertile than those whose sperm pass. Utah Center for Reproductive Medicine.
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Hamster zona-free ovum test Purpose to diagnose male fertility The hamster zona-free ovum test HZFO test , or hamster test is a method for diagnosing male infertility due to the inability of the sperm to penetrate the ova. These embryos are typically destroyed before they divide into two cells and are never known to have been implanted in either a hamster or human uterus to develop. From Wikipedia, the free encyclopedia.