The<unk>  (HZFO<unk> , or<unk>  egg-penetration<unk> , or sometimes just<unk> <unk> , is an in-vitro<unk>  used to study physiological profile of spermatozoa. The primary application of the<unk>  is to diagnose male infertility caused by sperm unable to penetrate the ova. The<unk>  has limited value, due to expense and a high false negative rate.
Hamster zona-free ovum test
Sperm–cervical mucus contact test
Postcoital test
Vaginal wet mount
Egg hatch assay
Poppy seed test
Triple smear
Karyotype