The singular word of "semen analyses" is "semen analysis."
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Semen analysis does not test for STDs. Ask your health care
provider for STD testing.
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Semen analysis would be a part of the initial surgical package
when the vasectomy was done.
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Your question is not entirely coherent. Although, I think you're
asking how long semen can be detected in the vagina for an
analysis. Semen can live up to 5 days in the vagina and still be
analyzed.