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CMV IgG

Infection and immunity tests · also printed as CMV antibody, Cytomegalovirus IgG, CMV IgG antibody, CMV serology, CMV Ab

Typical UK adult rangeExpected result: Positive

Positive, or Immune, is the expected result in someone who has been vaccinated or infected; Negative means no immunity.

What this test measures

CMV IgG shows past infection with cytomegalovirus, a common virus that most adults have met without noticing. It matters in pregnancy, transplantation and immune suppression.

Why doctors request it

Checked before transplantation, in pregnancy after possible exposure, and before some treatments.

What commonly pushes it up

Past infection or vaccination, both giving lasting immunity

What commonly pushes it down

Negative means no immunity

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.

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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.