For males, a fertile normal sperm quantity should be around 20 million per milliliter, and if it is less than that than it is considered to be oligospermia or low sperm count.

To find out if a man is suffering from oligospermia, it is necessary that he undergoes a certain examination known as spermogram. Usually, when a couple starts trying for pregnancy, the time for a natural pregnancy to happen is 12 months normally but if that pregnancy range does not happen, the couple should go to a doctor to undergo fertility testing.