The determination of morphology by Kruger makes it possible to more accurately determine the ability of a sperm cell to penetrate an egg.

When fertilizing an egg, not only the number and motility of spermatozoa is of crucial importance, but also their morphology, that is, their appearance. Only spermatozoa with a normal shape move in a straight line at the required speed and can give rise to a new life. Various abnormalities of the body and tail of spermatozoa reduce the chances of conception naturally.