Question: what causes abnormal sperm cells?
Answer: The condition is caused by a specific genetic mutation. Many causes of poor sperm shape can also lead to poor sperm motility or low sperm count. Oligoasthenoteratozoospermia (OAT) is when all sperm parameters (sperm count, movement, and shape) are abnormal. 2﻿ This is the most common cause of male infertility.