Motility of sperm refers to its ability to swim in a forward direction. Normal sperm motility plays a crucial role in men's reproductive health since the sperm have to be able to reach the egg in the uterus in order to fertilise it. If a sperm is unable to move properly, then getting pregnant and conceiving naturally can become an issue. With that being said, it is important to know that not all the sperm need to be motile or be able to move in the right direction.
Sperm density is the number of sperm that are present per milliliter cc of semen. Sperm density is typically reported in units of millions of sperm per cc. However, using the total motile count TMC is arguably an even better way of judging male fertility potential. Oligospermia : any sperm density less than what is considered normal.
Sperm motility refers to the movement of the sperm and plays a major role in achieving pregnancy. For conception to occur, the sperm need to swim forward towards the egg and fertilise it before it disintegrates. It is not necessary for all the sperm to move. Total motility records all the sperm that are moving, be it the ones that move with forwarding progression, one that moves in circles or the ones that are only fluttering their tails.