What it measures
The total amount of IgG antibodies in the blood. IgG is the most common antibody class. The body makes it after infections and vaccinations, and it stays in the blood for a long time.
Why people test it
- Investigating frequent or severe infections, usually together with IgA and IgM.
- Measured when another blood test suggests myeloma or a related condition.
- Checking IgG in liver disease or autoimmune conditions, where it can be raised.
- Monitoring people given immunoglobulin replacement for low antibody levels.
Typical range
Gloucestershire Hospitals' laboratory gives an adult range (ages 16 to 60) of 7.00 to 16.00 g/L. Ranges vary by lab, method, age and sex, and your report shows the lab's own range. Source: Gloucestershire Hospitals NHS Foundation Trust, Pathology: Immunoglobulins and electrophoresis.
Finger-prick or vein?
A finger-prick sample is usually fine for this test, and some providers offer a home kit. Others take blood from a vein at a clinic.