Globulin (and A/G Ratio): What Your Result Means

What is Globulin (and A/G Ratio)?

Total blood protein is albumin plus globulins. Albumin is made by the liver; globulins include antibodies (immunoglobulins) and carrier proteins. Because laboratories often measure total protein and albumin directly, globulin is calculated by subtraction, and the albumin/globulin (A/G) ratio gives a quick view of the balance.

Typical reference interval: Globulin commonly runs about 2.0–3.5 g/dL, with an A/G ratio near 1.0–2.5; laboratories publish their own ranges.. Laboratories differ — the interval printed on YOUR report always governs.

If your Globulin (and A/G Ratio) is high

Common reasons Globulin (and A/G Ratio) runs above the reference interval:

• Chronic infection or inflammation — the immune system makes more antibodies and acute-phase proteins
• Liver disease — advanced liver disease can raise globulins even as albumin falls
• Multiple myeloma and related disorders — a single abnormal antibody can markedly raise globulin
• Autoimmune conditions — chronic immune activation raises immunoglobulins

If your Globulin (and A/G Ratio) is low

Common reasons Globulin (and A/G Ratio) runs below the reference interval:

• Reduced antibody production — rare immune deficiencies
• Protein loss — kidney (nephrotic) or gut protein loss
• Malnutrition or malabsorption — reduced protein synthesis

Symptoms worth knowing

Globulin changes cause no direct symptoms; fatigue, swelling, recurrent infections, or the features of the underlying condition bring the test about.

What usually happens next

1. A low A/G ratio with low albumin raises concern for liver or protein-loss disease
2. A high globulin may prompt serum protein electrophoresis to look for a monoclonal protein
3. Interpret alongside albumin, liver tests, and kidney function

Frequently asked questions about Globulin (and A/G Ratio) results