Non-Obstructive Azoospermia (NOA)
Azoospermia is the absence of sperm cells in the ejaculate. Out of it, approximately 60% are classified as Non-obstructive Azoospermia (NOA) and 40% as Obstructive Azoospermia (OA).
Non-Obstructive Azoospermia (NOA) is a medical condition in which the man cannot produce sperm due to the failure of spermatogenesis. It is one of the severe forms of male infertility.