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A postcoital test is done to check a woman's cervical mucus after sex to see whether sperm are present and moving normally.
This test is done if a woman is not able to become pregnant and other tests have not found a relevant cause.
Dead sperm mean that the cervical mucus has problems that affect the sperm or that your partner has developed antibodies
against the sperm.
This is called immunological infertility
Please consult your Gynaecologist for further care and management.
Hope this answer is helpful.