|Covid-19|Hamster egg penetration test Wikipedia
Hamster egg-penetration test (HEPT) (or simply Sperm penetration test) is an in-vitro test used to study physiological profile of spermatozoa. It makes use of zona-free hamster egg, which resembles human ovum. A normal sperm is capable of penetrating the egg, showing its fertilizing capacity. The test is expensive and not reliable.