What the total protein test shows
Total protein measures the combined amount of all proteins dissolved in the serum — the liquid part of blood. Two families make up almost the whole result: albumin, made by the liver and about 60% of the total, and the globulins, meaning antibodies plus transport and clotting proteins. MedlinePlus calls it a broad measure of blood protein, usually run inside a comprehensive metabolic panel.
Its value is comparative. Subtracting albumin from total protein leaves the globulins, and the two are reported as the albumin-to-globulin (A:G) ratio, normally a little above 1. That ratio is often more telling than the total: a reversed ratio (more globulin than albumin) is the classic prompt to look for a myeloma-type protein, while a low total driven by low albumin points to the liver, kidneys or nutrition. Measuring albumin alone misses the globulins that total protein reveals. Most plasma proteins are made in the liver, so it travels with the liver enzymes, as StatPearls notes.
Total protein normal range
Total protein is reported in g/dL on US reports and in g/L in SI units. The two are not equal — multiply g/dL by 10 to get g/L, so 7.0 g/dL = 70 g/L. Typical adult orientation values:
| Group | Total protein, g/dL (g/L) |
|---|---|
| Adults (men and women) | ~6.0–8.3 (60–83) |
| Pregnancy | runs lower — dilution can drop it ~0.5–1 g/dL |
| Children & adolescents | age-specific — use your lab’s range |
| Newborns & infants | lower than adults — age-specific |
Sex barely matters (men average slightly higher). The total is read with its parts: albumin ~3.5–5.0 g/dL (35–50 g/L), calculated globulins ~2.0–3.5 g/dL (20–35 g/L), and an A:G ratio around 1.1–2.5. Reference ranges depend on the lab, sex and age — always read your result against your own report’s range.
Why total protein is high
A raised total protein (hyperproteinemia) is usually mild and rarely means the body truly makes too much. Roughly by frequency:
- Dehydration (most common). Less water in the plasma concentrates every protein, so the total rises with no true excess; a tight tourniquet during the draw does the same. Rehydrating and repeating usually settles it.
- Chronic inflammation or infection. Long-running immune activity raises many antibodies at once — a polyclonal rise in globulins — as in chronic infection, autoimmune disease or cirrhosis, so it is read with CRP.
- Monoclonal gammopathy. A single clone of plasma cells overproduces one antibody, lifting globulins and often reversing the A:G ratio — spanning benign MGUS (common with age) and the cancers multiple myeloma and Waldenström macroglobulinemia, which Cleveland Clinic lists among reasons to investigate.
When is it urgent? A high total protein with a reversed A:G ratio — especially with bone pain, unexplained anemia, high calcium or failing kidneys — needs a prompt work-up (serum protein electrophoresis, or SPEP, plus free light chains) to rule out myeloma.
Why total protein is low
A low total protein (hypoproteinemia) is more common and almost always reflects a fall in albumin, which alone makes up more than half the total — so its causes overlap heavily with a low albumin, as StatPearls explains. Roughly by frequency:
- Dilution. Extra fluid lowers the concentration — pregnancy, intravenous fluids, heart failure and advanced liver disease with fluid retention.
- Reduced production. The liver makes most plasma proteins, so cirrhosis and other liver disease cut output, as do malnutrition and malabsorption such as celiac disease.
- Protein loss. Protein leaks away faster than it is made — through the kidneys in nephrotic syndrome (heavy protein in the urine), the gut in protein-losing enteropathy, or the skin in severe burns.
- Inflammation. Albumin falls in acute illness (a negative acute-phase protein), pulling the total down.
When is it urgent? Marked swelling (ankles or around the eyes) with frothy urine suggests nephrotic syndrome and warrants prompt assessment, as do signs of failing liver disease — jaundice, abdominal swelling or confusion. A mildly low value in someone who feels well is usually diet- or dilution-related.
What to test alongside
Total protein points to the next test rather than a diagnosis on its own:
- Albumin — the largest fraction; total protein minus albumin gives the globulins and the A:G ratio.
- ALT, AST, GGT, Alkaline phosphatase and Bilirubin — the liver panel, since the liver makes most plasma proteins.
- Creatinine and Urea — kidney function; nephrotic syndrome loses protein through the urine.
- CRP — flags the inflammation that raises globulins and lowers albumin.
- Hemoglobin — anemia accompanies both chronic disease and multiple myeloma.
Depending on the pattern, a doctor may add serum protein electrophoresis (SPEP), free light chains or a urine protein check.
What to do about an abnormal result
- Don’t self-treat. Total protein is a signpost, not a diagnosis; protein powders or supplements will not correct an abnormal value and can hide its cause.
- Repeat in context. Dehydration and a tight tourniquet raise it artificially, so recheck a mildly abnormal result when well hydrated, with albumin and CRP.
- For a high result: the aim is to tell a polyclonal rise (inflammation, infection, liver disease) from a monoclonal one; a reversed A:G ratio prompts SPEP, free light chains and a hematology referral if a paraprotein turns up.
- For a low result: the work-up follows albumin — liver tests, a urine protein check for the kidneys, and a nutrition and gut review — to see whether the problem is production, loss or dilution.
- See your GP or primary-care physician first. They read total protein alongside albumin, the liver and kidney panels and your symptoms, then arrange the right next test.
Mini-FAQ
What is the difference between total protein and albumin?
Albumin is the single largest blood protein and is measured on its own; total protein adds albumin to all the globulins, including antibodies. Subtracting albumin gives the globulin level and the albumin-to-globulin (A:G) ratio.
What does a high total protein mean?
Most often dehydration, which concentrates the blood, or long-standing inflammation or infection. Less often it signals a monoclonal gammopathy such as multiple myeloma, so a persistently high result with a reversed A:G ratio is investigated with protein electrophoresis.
What does a low total protein mean?
Usually a low albumin — from liver disease, kidney protein loss (nephrotic syndrome), poor nutrition or dilution by excess fluid. Because albumin is more than half the total, the two share causes.
Do I need to fast before a total protein test?
Not for total protein itself, but it is often part of a comprehensive metabolic panel that includes glucose, so your lab may ask you to fast for a few hours. Follow your request form.
Can dehydration affect the result?
Yes. Dehydration concentrates the plasma and can raise total protein, and a prolonged tourniquet does the same; both are corrected by rehydrating and repeating if needed.
