All tests › Infection and immunity tests

SARS-CoV-2 PCR or antigen test

Infection and immunity tests · also printed as COVID PCR, SARS-CoV-2 PCR, SARS-CoV-2 RNA, COVID-19 PCR, Coronavirus PCR

Typical UK adult rangeExpected result: Not detected

Not detected is the expected result.

What this test measures

This test detects the COVID-19 virus itself, by PCR on a swab or with a lateral flow antigen test. It shows current infection.

Why doctors request it

Used in hospital admissions and when symptoms suggest COVID-19.

What commonly pushes it up

Current infection
PCR can stay positive for weeks after recovery

What commonly pushes it down

A negative result is the usual finding

Everyday reasons for a value outside the range

Results can be equivocal and are then repeated
Recent vaccination or infection elsewhere can occasionally give a weak positive

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 SARS-CoV-2 PCR or antigen test on it?

Upload a photo or PDF and see every line against the range your lab printed, explained in plain English. First report free.

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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.