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Necrospermia - Condition in which sperm are produced but are found dead in the semen and are unable to fertilize eggs.

NEST - See Nonsurgical Embryonic Selective Thinning.

Nonsurgical Embryonic Selective Thinning - A form of assisted hatching using a chemical to thin the outer membrane of the zona pellucida rather than scraping.

Non-surgical Sperm Aspiration - The procedure is performed under sedation. A tiny needle is used to extract sperm directly from the testis in those who have blocked ducts or cannot ejaculated. Used in conjunction with in vitro fertilization and ICSI.

NSA - see Nonsurgical Sperm Aspiration.