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Post-vasectomy semen test

Fertility and pregnancy · also printed as Post vasectomy semen analysis, PVSA, Vasectomy semen test, Post-vasectomy sample, Vasectomy clearance

Typical UK adult rangeExpected result: No sperm seen

No sperm seen, or rare non-motile sperm, is the result that confirms clearance.

What this test measures

After a vasectomy the semen is checked to confirm that no sperm remain. Clearance is usually confirmed at about 12 to 16 weeks.

Why doctors request it

Requested after vasectomy before other contraception is stopped.

What commonly pushes it up

Sperm still present, which is common in the first weeks and occasionally persists

What commonly pushes it down

A negative result is the usual finding

Everyday reasons for a value outside the range

Low-level positives occur in the general population and are read with the clinical picture
Thresholds differ between laboratories

About the sample

No fasting needed.

Written by a UK consultant physician. Typical UK adult reference ranges; your laboratory's own printed range takes precedence.

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This is an educational summary of results you uploaded. It is not medical advice, a diagnosis or a treatment plan, and it does not replace the doctor who requested the test. If you are worried, or a result is marked outside range, discuss it with your doctor. Written and reviewed by a UK consultant physician. Reference ranges vary between laboratories.