Fertility Glossary

Oligoasthenoteratozoospermia (OAT)

Low count, reduced movement and fewer normally shaped sperm together.

Male fertility

OAT is a descriptive result rather than a diagnosis of cause. ICSI is often recommended.

Also known as: OAT, OATS

Sources

WHO laboratory manual for the examination and processing of human semen (6th edition)
NHS — Infertility

Last reviewed: 23 September 2026. Written by the Antega Editorial Team. General information only — always follow the advice of your own clinic, doctor or pharmacist.

Related terms

Oligozoospermia

A lower sperm count than the reference range.

Asthenozoospermia

Lower-than-expected sperm movement.

Teratozoospermia

A low percentage of normally shaped sperm.

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