What Is Globulin in a Blood Test? Normal Range & What It Means

High globulin most often reflects chronic inflammation or infection, since the immune system produces more antibody proteins. It can also occur with autoimmune disease, liver disease, and, less commonly, blood cancers like multiple myeloma. It's evaluated with your A/G ratio and total protein.

A mildly high globulin level is common and often not serious, especially during or after an infection. Your doctor considers it alongside your other protein values and symptoms before ordering additional tests.

A normal globulin level for most adults is roughly 2.0–3.5 g/dL, though reference ranges vary by lab and are read alongside the total protein and albumin measured on the same panel. Levels above about 3.5 g/dL are considered high and often reflect inflammation, infection, or autoimmune activity, while levels below about 2.0 g/dL are considered low and can point to immune or liver problems. Your doctor interprets your specific number against the range printed on your own report.

Low globulin (below roughly 2.0 g/dL) usually means your body is making fewer immune or transport proteins than normal, or losing them faster than it can replace them. Common causes include an immune deficiency, kidney disease that lets protein leak into the urine, and liver disease that impairs protein production. It's typically evaluated alongside albumin, total protein, and the A/G ratio, and a clinician looks at the pattern of all three together rather than the globulin number alone.