Globulin: normal range and what it means
Short answer: The normal globulin range is 2 – 3.5 g/dL for adults. In SI units that is about 20 – 35 g/L. Labs differ a little, so also check the range printed on your report.
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Information, not a diagnosis. Talk to a doctor about your result, and sooner if you feel unwell.
Proteins including antibodies; read with albumin.
Normal range
Adult reference range.
- Low< 2 g/dL
- Normal2 – 3.5 g/dL
- High≥ 3.5 g/dL
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Albumin/globulin (A/G) ratio calculator
A/G ratio = albumin ÷ globulin; globulin = total protein − albumin
Source: Busher JT. Serum albumin and globulin. In: Walker HK, Hall WD, Hurst JW, eds. Clinical Methods: The History, Physical, and Laboratory Examinations. 3rd ed. Boston: Butterworths; 1990. Chapter 101.
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A pointer, not a diagnosis. Talk to a doctor about your result, and sooner if you feel unwell.
What it measures
The non-albumin proteins in blood, most of them antibodies. Raised levels point towards chronic infection, inflammation or, less often, a marrow disorder.
What moves it
Immune activity and chronic inflammation. Calculated as total protein minus albumin.
How to bring it into range
Read it with albumin as a ratio. A persistently high globulin with a low albumin deserves proper investigation.
How fast it responds
Weeks to months.
Also reported as: serum globulin
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Common questions
- What is the normal globulin range?
- The normal globulin range is 2 – 3.5 g/dL for adults. In SI units that is about 20 – 35 g/L. Labs differ a little, so also check the range printed on your report.
- What does a high Globulin mean?
- A value above the reference band means Globulin is outside the range typical for a healthy adult. A single reading is rarely conclusive on its own — what matters is the trend across draws and the other markers around it, which is why HealthOS reads the whole panel together rather than one number at a time.
- How do I improve my Globulin?
- Read it with albumin as a ratio. A persistently high globulin with a low albumin deserves proper investigation.
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Reference ranges are general-population guidance compiled from common clinical laboratories, not a diagnosis. Lab-to-lab ranges differ. Always read your results with your doctor.