What this test measures
Total protein measures the combined concentration of albumin (about 60%) and globulins (about 40%) in serum. Albumin is the main transport and oncotic protein, produced by the liver. Globulins include immunoglobulins (antibodies), transport proteins (transferrin, ceruloplasmin) and acute-phase proteins.
Total protein is usually reported alongside albumin, with globulin calculated by subtraction (Globulin = Total Protein − Albumin) and the A/G ratio derived. This trio gives a quick read of liver synthesis (albumin) and the immune / inflammatory state (globulins).
Why it matters
In India, total protein and the A/G ratio help separate chronic liver disease (low albumin, low total protein, low A/G ratio) from chronic infection / inflammation (normal albumin, high globulins, low A/G ratio), multiple myeloma (high globulins from a monoclonal spike), and protein-losing states (nephrotic syndrome, malabsorption).
It is a simple, cheap test ordered as part of the LFT in any patient with unexplained fatigue, weight loss, swelling, recurrent infections, suspected liver or kidney disease, or as part of a routine "what is going on" workup.
How to prepare
No strict fasting required, though it is often part of an LFT panel that requests fasting. Sit for at least 5 minutes before sample collection — prolonged standing or tight tourniquet can falsely raise total protein. Mention any IV fluids in the past 24 hours.
Markers & reference ranges
Reference ranges below are typical adult values. Your lab's reported range may differ slightly based on the assay platform and patient demographics — always read your report against the range printed on it.
| Marker | Normal range | If low | If high |
|---|---|---|---|
| Total Protein (g/dL)[1][2] | 6.4 – 8.3 | Low total protein (hypoproteinaemia) — most commonly low albumin (liver disease, nephrotic syndrome, malnutrition, protein-losing enteropathy) plus or minus low globulins (immune deficiency, severe malnutrition). Check the albumin and globulin split to localise the cause. | High total protein (hyperproteinaemia) — usually means high globulins (chronic infection like TB / HIV / kala-azar, autoimmune disease, multiple myeloma, monoclonal gammopathy, chronic liver disease with reactive globulin rise). A markedly raised globulin or low A/G ratio (<1) calls for serum protein electrophoresis (SPEP) to look for a monoclonal band. Mild rises can simply mean dehydration. |
Patterns in total protein / albumin / globulin
| Pattern | Albumin | Globulin | A/G ratio | Likely cause |
|---|---|---|---|---|
| Normal | 3.5 – 5.2 | 2.0 – 3.5 | 1.0 – 2.0 | Healthy adult |
| Low TP, low Albumin | Low | Normal/low | Normal or low | Liver disease, malnutrition, nephrotic syndrome |
| Normal TP, low Albumin, high Globulin | Low | High | Low (<1) | Chronic infection (TB, HIV), autoimmune disease, multiple myeloma |
| High TP, very high Globulin | Normal | Very high | Very low | Multiple myeloma, MGUS — needs SPEP |
| High TP (mild) | Mildly high | Mildly high | Normal | Dehydration — rehydrate and retest |
Frequently asked questions
Do I need to fast for a total protein test?
Not strictly. It is often part of an LFT, where fasting may be requested if paired with lipid or glucose tests.
My total protein is 8.5 — should I worry?
A mildly raised total protein is usually dehydration. If it is from raised globulins (with normal albumin), your doctor may add a serum protein electrophoresis (SPEP) to look for myeloma or chronic inflammation.
What is the A/G ratio and why does it matter?
The Albumin/Globulin ratio (normal 1–2) separates low-albumin states (liver, kidney, gut) from high-globulin states (chronic infection, myeloma). An A/G ratio < 1 always warrants further evaluation.
Can multiple myeloma show up here?
Yes — classic myeloma shows high total protein, high globulins, low albumin and a very low A/G ratio. Serum protein electrophoresis (SPEP) and immunofixation are the next steps.
Why is my total protein low in nephrotic syndrome?
Nephrotic syndrome loses albumin (and some globulins) in the urine because of damaged glomeruli — total protein falls, urine protein is high, oedema follows.
Does a high-protein diet change serum total protein?
Not meaningfully. Serum proteins are kept in a tight homeostatic range by the liver and kidneys.
What does low total protein in pregnancy mean?
Mild reduction is normal in pregnancy because plasma volume expands. Values 0.5–1.0 g/dL below non-pregnant range are expected, especially in the third trimester.
Related Liver / Enzymes tests
Tests commonly ordered alongside PROTEIN - TOTAL, or that help interpret an unexpected result.
Sources & references
- NIH MedlinePlus — Total Protein Test · accessed 2026-05-30T00:00:00.000Z
- NCBI StatPearls — Total Protein · accessed 2026-05-30T00:00:00.000Z
- Mayo Clinic Laboratories — Total Protein, Serum · accessed 2026-05-30T00:00:00.000Z
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