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Prothrombin gene variant

Genetic tests · also printed as Prothrombin G20210A, Prothrombin gene mutation, Prothrombin 20210, F2 G20210A, Prothrombin variant

Typical UK adult rangeExpected result: Not detected

Not detected is the usual result.

What this test measures

This is an inherited change in the prothrombin gene that slightly increases clotting tendency. About one person in fifty of European ancestry carries it.

Why doctors request it

Tested alongside Factor V Leiden after an unexplained clot.

What commonly pushes it up

What commonly pushes it down

Everyday reasons for a value outside the range

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.

Got a report with Prothrombin gene variant on it?

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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.