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Immunology

Immunoglobulin G

The most abundant antibody class, and the one that carries long-term immunity after infection or vaccination.

Unit mg/dLTypical adult range 650–1600 mg/dL
What it is

The most abundant antibody class, and the one that carries long-term immunity after infection or vaccination.

Why it matters

It is the main measure of whether the immune system can mount and keep an antibody response.

Reading the number

A low value is the finding that matters, because it means less protection against infection; a modestly high one usually just reflects chronic immune stimulation. It makes up most of the gamma band on protein electrophoresis, so the two should agree.

What moves it
chronic infectionautoimmune conditionssome medicationsprotein loss through kidney or gut
Read alongside
Immunoglobulin AImmunoglobulin MGamma globulinsImmunoglobulin E (total)
When to raise it

Worth discussing a low value, especially with frequent infections.

Tracking only, not a diagnosis. The range above is a typical adult reference range — the range printed by the lab that ran your test is the one that applies to you. Discuss anything that concerns you with your doctor.

Also known as

On a report in another language.

A lab report names this analyte in its own language. Vitals Vault recognises each of these and files them all under Immunoglobulin G.

Imunoglobulina G SéricaImunoglobulina GIgGImmunglobulin G

Track your immunoglobulin g over time.

Immunoglobulin G is one of 165 analytes Vitals Vault charts over time. Import a lab report in any language and this number lands on a timeline only you can read.

Continue with Google
Tracking only. This app is not medical advice. Always discuss results and future analysis with your doctor.

Catalog entry last updated 2026-08-28. Browse all 165 metrics.