Albumin/Globulin (A/G) Ratio Calculator
The A/G ratio compares the two main protein groups in your blood: albumin (made by the liver — maintains fluid balance and carries hormones, drugs, and nutrients) and globulins (a mixed family that includes your antibodies). Most lab reports print the ratio directly, but if yours only shows albumin and total protein, the ratio is one subtraction and one division away. Either way, the interpretation table below tells you what your number usually means.
A/G ratio from albumin + total protein
From your metabolic panel
Same report — globulin = total protein − albumin
Enter your value above to see the result.
Already have the ratio? Look it up
Many reports print 'A/G ratio' directly
Enter your value above to see the result.
This result is a screening estimate, not a diagnosis. Discuss your labs with a qualified healthcare professional.
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How it works
The formula
Globulin = total protein − albumin. A/G ratio = albumin ÷ globulin. Example: albumin 4.2 g/dL with total protein 7.0 g/dL gives globulin 2.8 and an A/G ratio of 1.5. Both modules use g/dL — no unit conversion needed on a standard US panel.
What the two protein groups do
Albumin (about 60% of plasma protein) keeps fluid inside blood vessels and ferries hormones, medications, and nutrients — it drops with liver synthetic problems, kidney or gut losses, and chronic inflammation. Globulins include your immunoglobulins (antibodies) plus transport proteins — they rise with immune activation. The ratio compresses that balance into one number. For an inflammation-focused composite using albumin, see our hs-CRP:Albumin Ratio Calculator; for a cell-count immune signal, see the NLR Calculator.
Evidence level & limitations
A/G reference windows are laboratory conventions, not guideline cut-offs, and ranges vary between labs. Many unrelated conditions move the ratio in the same direction, and persistent unexplained abnormalities — in either direction — deserve evaluation by a qualified practitioner, because the underlying causes range from benign (dehydration) to serious (blood disorders). A screening signal, not a diagnosis.
A/G ratio quick reference
Common readings for the albumin/globulin ratio. Laboratory conventions — your lab's printed range always comes first.
| A/G ratio | Reading | Common context |
|---|---|---|
| < 1.0 | Globulin-dominant | Chronic immune activation patterns, reduced liver protein synthesis, or albumin loss — worth medical context |
| 1.0 – 2.0 | Common window | Typical reference range in most labs (some extend to 2.5) |
| > 2.0 | Albumin-dominant | Relatively low globulin fraction; less often emphasized — check hydration, trends |
A screening signal, not a diagnosis. Persistent abnormalities in either direction deserve a practitioner's workup.
Frequently asked questions
What is the albumin globulin ratio in a blood test?
It compares your albumin (the liver-made protein that maintains fluid balance) to your globulins (a family that includes your antibodies). It comes standard on comprehensive metabolic panels — either printed directly as 'A/G ratio' or derivable from albumin and total protein: globulin = total protein − albumin, then A/G = albumin ÷ globulin.
What does a high albumin globulin ratio mean?
Usually that your globulin fraction is relatively low compared to albumin. High A/G is less often clinically emphasized than low A/G — dehydration is a common benign cause because it concentrates all proteins. If it persists without an obvious explanation, it's worth a conversation with your practitioner.
What does a low albumin globulin ratio mean?
That globulins outweigh albumin — a pattern that appears with chronic immune activation, reduced liver protein synthesis, or albumin loss (kidney or gut). It's a nonspecific screening signal: many unrelated conditions produce it, so context, symptoms, and trends matter far more than a single value.
What is a normal A/G ratio?
Most labs cite roughly 1.0–2.0, with some extending the upper bound to 2.5. These are laboratory conventions, not official cut-offs — always read your result against the reference range printed on your own report.
Do I need to fast for this test?
No fasting is required for albumin, total protein, or the A/G ratio itself. What matters more is hydration — being dehydrated concentrates blood proteins and can push albumin, globulin, and the ratio upward.
Is an abnormal A/G ratio a sign of something serious?
Usually not on its own — the ratio is nonspecific and shifts with common, benign situations like dehydration or a recent infection. But persistent, unexplained abnormalities deserve a proper workup, because the possible causes range from harmless to serious blood, liver, or kidney conditions. A single ratio never diagnoses anything.
Sources
- Busher JT. Serum Albumin and Globulin. In: Clinical Methods: The History, Physical, and Laboratory Examinations (NCBI Bookshelf), 1990.
- MedlinePlus. Total Protein and Albumin/Globulin (A/G) Ratio. U.S. National Library of Medicine.
This calculator is for informational purposes only and is not medical advice, diagnosis, or treatment. Reference ranges are general population guidelines — always discuss your lab results with a qualified healthcare professional.