Sperm & semen · In plain English

Antisperm antibodies

Immune proteins that can attach to sperm. Some laboratory reports describe IgA or IgG antibodies or use a mixed antiglobulin reaction (MAR) test.

Also searched as: IgA, IgG, MAR test, sperm antibodies

Why you might see this term

Antibodies may be considered in a specific clinical context; this is a different measurement from sperm count, shape or movement.

What to keep in mind

They are not a stand-alone explanation for infertility, and routine testing is not recommended for every patient. Ask how a result would change your care.

Sources & further reading

Prepared by ProFertility · Updated 23 October 2026.

Educational information based on the linked sources. This explanation is not an individual diagnosis or a treatment recommendation. A term appearing here does not mean the test is necessary or included in a particular kit.

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