Total protein blood test: what high and low total protein means
Total protein · Comprehensive metabolic panel (CMP), liver panel · reported in g/dL (some labs report g/L; 1 g/dL = 10 g/L)
Total protein is the combined amount of all the proteins dissolved in the liquid part of your blood, reported in grams per decilitre (g/dL) on a comprehensive metabolic panel or liver panel. About 60 percent of it is albumin, the protein the liver makes to hold water inside blood vessels and carry hormones, drugs and fatty acids; the rest is a mixture called globulins, which includes antibodies (immunoglobulins), transport proteins and the proteins of the clotting and inflammatory systems. For adults the usual range is about 6.0 to 8.3 g/dL, with small differences between laboratories.
A high total protein is most often a relative rise from dehydration, or a true rise in globulins from a chronic infection, an autoimmune disease, chronic liver disease or, less commonly, a plasma cell disorder such as multiple myeloma or its benign precursor MGUS. Albumin almost never rises above its range on its own, so a persistently high total protein is usually a globulin question. A low total protein is usually a low albumin and points to liver disease, kidney or gut protein loss, poor intake or absorption, or simply the inflammation of being unwell, since albumin falls quickly during any significant illness.
Total protein on its own is a blunt instrument. It cannot tell you which protein is high or low, which is why the same panel reports albumin and lets the lab calculate globulin and the albumin/globulin (A/G) ratio. A result outside the range is interpreted with those, with a repeat sample taken well hydrated, and when globulins are the problem, with serum protein electrophoresis, which separates the globulins into their fractions and shows whether a rise is broad (polyclonal, from inflammation) or a single spike (monoclonal, from a plasma cell clone).
Total protein at a glance
- What it is: the total of albumin (about 3.5–5.0 g/dL) and globulins (about 2.0–3.5 g/dL) in serum, measured on most routine chemistry panels.
- Normal (adults): about 6.0–8.3 g/dL; labs differ by a few tenths. Children are similar after infancy; pregnancy lowers it by 0.5–1.0 g/dL.
- High total protein (above about 8.3–8.5 g/dL): dehydration, chronic infection or inflammation, chronic liver disease, or a monoclonal gammopathy (MGUS, myeloma). Above 9 g/dL with normal albumin almost always needs protein electrophoresis.
- Low total protein (below about 6.0 g/dL): low albumin from liver disease, nephrotic syndrome, gut protein loss, malnutrition, acute illness or overhydration; low globulins from immune deficiency.
- A globulin level above about 4 g/dL, or total protein minus albumin above 4, is the usual trigger for serum protein electrophoresis and free light chains.
- Next step: repeat well hydrated, read with albumin, the A/G ratio, liver tests and a urine protein check; the follow-up depends on which fraction is off.
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What Total protein measures
The lab measures total protein in serum with the biuret reaction, in which copper ions bind to the peptide bonds of all proteins present and produce a color proportional to protein concentration. The assay does not distinguish one protein from another. Albumin is measured separately with a dye-binding method, and globulin is simply total protein minus albumin, so the globulin figure on your report is a calculation, not a direct measurement.
Albumin is made only by the liver, at about 10 to 15 g a day, and has a half-life of roughly 20 days, so it responds slowly to nutrition but quite quickly to inflammation, because inflammatory cytokines switch liver production away from albumin and make capillaries leak it into the tissues. Globulins come from several sources: the immune system makes immunoglobulins (IgG, IgA, IgM), and the liver makes most of the alpha and beta globulins, which include transport proteins such as transferrin and acute-phase proteins such as haptoglobin and complement.
Total protein is affected by things that have nothing to do with disease. Standing up for 15 to 30 minutes before the draw raises it by about 0.3 to 0.5 g/dL compared with lying down, because fluid shifts out of the circulation; a tourniquet left on for more than a minute does the same. Dehydration concentrates it and intravenous fluids or pregnancy dilute it. Fasting is not required, and there is no meaningful daily rhythm.
Normal range for Total protein
Reference ranges vary between labs and by age, sex and pregnancy. Use the range printed on your own report.
| Group | Typical range (g/dL (some labs report g/L; 1 g/dL = 10 g/L)) | Notes |
|---|---|---|
| Adults | 6.0–8.3 g/dL | Some labs use 6.4–8.3 or 6.0–8.5 g/dL; use the range printed on your report. |
| Albumin component | 3.5–5.0 g/dL | Roughly 55 to 65 percent of total protein in health. |
| Globulin component (calculated) | 2.0–3.5 g/dL | Total protein minus albumin. Above about 4 g/dL is the usual threshold for further testing. |
| Children (1 to 18 years) | About 6.0–8.0 g/dL | Newborns run lower, about 4.6–7.0 g/dL, and reach adult values over the first years. |
| Pregnancy, third trimester | About 5.5–7.5 g/dL | Plasma volume expands by 40 to 50 percent and albumin falls; this is expected, not a deficiency. |
| Mildly high | 8.3–9.0 g/dL | Most often dehydration, standing before the draw or a prolonged tourniquet. Repeat well hydrated and seated for 15 minutes before concluding anything. |
| Markedly high | Above 9.0 g/dL | Almost always a globulin rise. Serum protein electrophoresis is ordered; myeloma and Waldenström macroglobulinemia can push total protein above 10 to 12 g/dL. |
| Low | Below 6.0 g/dL | Usually low albumin. Below about 5.0 g/dL, or albumin below 2.5 g/dL, swelling (edema) becomes likely. |
High total protein
A high total protein means either that your blood is concentrated or that one of the protein fractions, nearly always the globulins, is genuinely raised. Dehydration from poor fluid intake, vomiting, diarrhea, sweating or diuretics raises albumin and globulins together, so the A/G ratio stays normal and the value falls back once you are rehydrated. Standing for a while before the draw and a tight tourniquet produce the same pattern. A single value of 8.4 to 9.0 g/dL in someone who feels well is far more often one of these than a disease.
A true rise in globulins has two patterns. A broad, polyclonal increase in immunoglobulins comes from long-standing immune activation: chronic infections such as HIV, hepatitis B or C and tuberculosis; autoimmune diseases such as rheumatoid arthritis, lupus and Sjögren's; sarcoidosis; and chronic liver disease, where cirrhosis commonly produces a globulin level of 4 to 5 g/dL alongside a low albumin. A narrow, monoclonal spike comes from a single clone of plasma cells. The benign version, monoclonal gammopathy of undetermined significance (MGUS), is present in about 3 percent of people over 50 and 5 percent over 70, and progresses to myeloma or a related disorder at about 1 percent a year. Multiple myeloma itself usually brings a total protein well above 9 g/dL together with anemia, a raised calcium, kidney impairment or bone pain.
The number that matters most for the next step is the globulin gap, total protein minus albumin. Above about 4 g/dL, or a globulin above the lab's upper limit, is the standard trigger for serum protein electrophoresis with immunofixation and serum free light chains, which together find nearly all monoclonal proteins. A high total protein with a high albumin and normal globulin is dehydration until proven otherwise.
Common causes
Dehydration and hemoconcentration
Fluid loss or poor intake concentrates every protein in the blood; albumin and globulins rise together and the A/G ratio stays normal. Sodium, BUN and hematocrit are often high at the same time, and the value normalizes with fluids.
Posture and venous stasis at the draw
Standing for 15 to 30 minutes raises total protein by 0.3 to 0.5 g/dL compared with lying down, and a tourniquet left on for more than a minute adds a similar amount. This alone can tip a borderline result over the range.
Chronic infection
HIV, chronic hepatitis B and C, tuberculosis, endocarditis, osteomyelitis and some parasitic infections keep the immune system producing antibodies for months to years, raising polyclonal IgG and sometimes IgA or IgM.
Autoimmune and inflammatory disease
Rheumatoid arthritis, systemic lupus, Sjögren's syndrome, autoimmune hepatitis and sarcoidosis all raise immunoglobulins, often with a high ESR; the rise tracks disease activity.
Chronic liver disease and cirrhosis
A damaged liver no longer clears gut-derived antigens, and the immune system responds with a broad globulin increase, typically with IgA prominent in alcohol-related disease and IgG in autoimmune hepatitis. Albumin is usually low at the same time, so the A/G ratio falls.
Monoclonal gammopathy (MGUS, multiple myeloma, Waldenström macroglobulinemia, amyloidosis)
A clone of plasma cells secretes a single antibody that appears as a spike on electrophoresis. MGUS causes a modest rise with no symptoms; myeloma can raise total protein to 10 g/dL or more and is usually accompanied by anemia, high calcium, kidney impairment or bone pain. Waldenström produces IgM and can cause hyperviscosity.
Medications and infusions
Androgens and anabolic steroids, growth hormone and insulin modestly raise albumin, and intravenous immunoglobulin (IVIG) raises IgG for weeks after each infusion. Hormonal contraception has little effect on total protein.
Allergic and chronic skin or lung disease
Severe atopic eczema, chronic bronchiectasis and cystic fibrosis keep IgE or IgG and IgA elevated, occasionally enough to raise total protein.
Symptoms that can go with it
- Usually none; a mildly high total protein is most often found on a routine panel
- Thirst, dark urine, dizziness on standing or a dry mouth when dehydration is the cause
- Bone pain (especially back or ribs), fatigue, frequent infections or unexplained anemia with myeloma
- Numbness or tingling in the hands and feet, which can accompany monoclonal proteins
- Blurred vision, nosebleeds, headache or confusion from hyperviscosity when IgM or IgG is very high
- Joint pain, rashes, dry eyes and mouth, or fevers with autoimmune disease
- Night sweats, weight loss or swollen lymph nodes, which need investigation whatever the protein level
Low total protein
A low total protein almost always means a low albumin. Albumin falls for four broad reasons: the liver is not making enough (cirrhosis, severe hepatitis); it is being lost through the kidneys (nephrotic syndrome, where more than 3.5 g of protein a day appears in the urine), the gut (protein-losing enteropathy, severe inflammatory bowel disease, celiac disease) or the skin (extensive burns); the building blocks are not coming in (malnutrition, malabsorption, anorexia, after bariatric surgery); or the body is inflamed. That last cause is the most common one in hospital: within days of a major infection, surgery or injury, albumin can fall by 1 g/dL or more because cytokines shut down liver production and make capillaries leak.
Dilution matters too. Intravenous fluids, overhydration, heart failure and pregnancy all lower total protein without any loss of protein from the body, and a sample taken lying down after a night in bed reads 0.3 to 0.5 g/dL lower than one taken after walking in to a clinic. A low globulin fraction is less common and points in a different direction: inherited or acquired immune deficiency (common variable immunodeficiency, X-linked agammaglobulinemia), medications such as rituximab, corticosteroids and chemotherapy, or loss of immunoglobulins in nephrotic syndrome.
The practical consequence of low albumin is fluid leaking out of the circulation. Below about 2.5 g/dL, ankle swelling, puffy eyes, fluid in the abdomen (ascites) and sometimes around the lungs become likely, and the response to diuretics weakens. Low albumin is also a strong general marker of how unwell someone is and of surgical risk, which is why it appears in liver, kidney and nutrition scoring systems.
Common causes
Malnutrition and malabsorption
Inadequate protein and calorie intake, anorexia nervosa, alcohol dependence, celiac disease, Crohn's disease, chronic pancreatitis and bariatric surgery all reduce the amino acids the liver needs. Albumin is a late and insensitive marker of this, falling only after weeks of deficit.
Liver disease
Cirrhosis and severe acute hepatitis reduce albumin synthesis; an albumin below 3.5 g/dL is one of the components of the Child-Pugh score. Globulins often rise at the same time, so total protein can look deceptively normal while the A/G ratio is low.
Nephrotic syndrome and other kidney protein loss
Damaged glomeruli let albumin and smaller globulins through; urine protein above 3.5 g a day with albumin below 3.0 g/dL, swelling and high cholesterol defines nephrotic syndrome. Diabetic kidney disease, lupus nephritis and minimal change disease are common causes.
Protein-losing enteropathy
Severe inflammatory bowel disease, celiac disease, intestinal lymphangiectasia, some infections and heart failure affecting the gut lining leak protein into the intestine; a raised stool alpha-1 antitrypsin confirms it.
Acute and chronic inflammation
Albumin is a negative acute-phase protein. Sepsis, pneumonia, major surgery, trauma, burns, cancer and active autoimmune disease all lower it within days, with CRP rising in mirror image.
Overhydration, intravenous fluids and pregnancy
Expanding plasma volume dilutes every protein. Total protein routinely drops 0.5 to 1.0 g/dL by the third trimester of pregnancy and after a liter or two of IV fluid.
Heart failure
Fluid retention dilutes the blood, gut congestion impairs absorption and leaks protein, and chronic inflammation lowers albumin synthesis; low albumin in heart failure predicts a worse outcome.
Extensive burns and severe skin disease
Large burns, erythroderma and severe pemphigus lose protein directly through the skin, and the accompanying inflammation suppresses albumin production.
Immune deficiency and immunosuppressive drugs
Common variable immunodeficiency, X-linked agammaglobulinemia, chronic lymphocytic leukemia, myeloma with suppression of normal antibodies, rituximab, long-term corticosteroids and chemotherapy lower globulins, which shows as a high A/G ratio with a low or low-normal total protein.
Symptoms that can go with it
- Swelling of the ankles, legs or around the eyes, worse by the end of the day
- A swollen abdomen from fluid (ascites) or breathlessness from fluid around the lungs
- Fatigue, weakness and loss of muscle bulk
- Foamy urine, which suggests protein loss through the kidneys
- Chronic diarrhea, weight loss or bloating with gut causes
- Frequent chest, sinus or ear infections when globulins are low
- Brittle hair and nails, or slow wound healing, with long-standing poor nutrition
Read it alongside
- Albumin — the fraction that falls with liver disease, kidney or gut loss, malnutrition and inflammation; most low total proteins are low albumin.
- Globulin and the A/G ratio — total protein minus albumin; a globulin above about 4 g/dL or an A/G ratio below 1.0 directs attention to immunoglobulins.
- Serum protein electrophoresis, immunofixation and free light chains — distinguish a broad polyclonal rise (inflammation, liver disease) from a monoclonal spike (MGUS, myeloma, Waldenström).
- ALT, AST, alkaline phosphatase and bilirubin — liver injury or cholestasis behind a low albumin or high globulin.
- Urine protein or urine albumin/creatinine ratio — protein loss through the kidneys; more than 3.5 g a day is nephrotic range.
- CBC, calcium and creatinine — anemia, high calcium and kidney impairment are the features that turn a high globulin into a myeloma work-up.
- CRP and ESR — a raised CRP explains a fall in albumin; a very high ESR with a normal CRP suggests a paraprotein.
- Sodium, BUN and hematocrit — all high alongside a high total protein points to dehydration rather than a protein disorder.
What usually happens next
- If the result is mildly high and you were unwell, dehydrated or standing before the draw, expect a repeat well hydrated and seated for 15 minutes; many borderline values normalize.
- If globulin is above about 4 g/dL or the A/G ratio is below 1.0 on the repeat, the next tests are serum protein electrophoresis with immunofixation, serum free light chains, and often IgG, IgA and IgM levels, plus a CBC, calcium and creatinine.
- A polyclonal globulin rise usually prompts a review for chronic infection (HIV, hepatitis B and C), autoimmune disease (ANA, rheumatoid factor) and liver disease, depending on your history.
- If the result is low, albumin, liver tests, a urine protein check and a CRP come first; celiac serology, stool alpha-1 antitrypsin or a nutrition assessment follow if those point to the gut or to intake.
- Useful questions to ask: which fraction is abnormal, albumin or globulin; whether the sample was concentrated or diluted; and whether a monoclonal protein has been excluded if globulins are high.
Diet, lifestyle and natural levers with evidence
What can move Total protein once the cause is known. Nothing here replaces finding the cause.
Adequate protein and energy intake
Moderate evidenceAlbumin cannot be made without amino acids, and intake below about 0.8 g of protein per kilogram a day is common in older adults and in people recovering from illness. The PROT-AGE expert group recommends 1.0 to 1.2 g/kg a day for healthy people over 65 and 1.2 to 1.5 g/kg during illness or recovery. A Cochrane review of 62 trials of protein and energy supplements in older people at risk of malnutrition found small gains in weight and fewer complications; the effect on albumin itself is modest and takes weeks, because inflammation, not intake, is the usual reason it is low.
People with advanced kidney disease who are not on dialysis are usually advised to keep protein at about 0.6 to 0.8 g/kg a day; ask your clinician before increasing intake.
Treating the gut cause: gluten-free diet in celiac disease
Moderate evidenceIn celiac disease, protein loss through the damaged lining and poor absorption lower albumin; a strict gluten-free diet lets the villi recover, and cohort studies show albumin and other nutritional markers normalize within 6 to 12 months in most people. The same principle applies to Crohn's disease and other causes of protein-losing enteropathy, where controlling intestinal inflammation is what raises the protein level.
Reducing or stopping alcohol
Moderate evidenceHeavy drinking produces the classic combination of low albumin and high globulins (particularly IgA) by damaging the liver and the gut barrier. In alcohol-related liver disease, abstinence is the single strongest predictor of survival, and cohort studies show albumin and Child-Pugh scores improve over 3 to 6 months of not drinking, provided cirrhosis is not too advanced.
Hydration and test conditions
Strong evidenceBecause dehydration, posture and tourniquet time can move total protein by 0.3 to 0.8 g/dL, a borderline high result is best repeated after normal fluid intake and 15 minutes seated. A sample drawn after a night lying in bed reads lower than a daytime outpatient sample. This does not treat anything, but it prevents a large share of unnecessary follow-up for values between 8.3 and 9.0 g/dL.
When to see a clinician promptly
- A total protein above 9 g/dL, or a globulin above 4 g/dL, with bone pain, unexplained anemia, fatigue, frequent infections or kidney problems: multiple myeloma needs to be ruled out within days, not months.
- A low total protein with swelling of the legs or abdomen, breathlessness, or foamy urine, which can mean nephrotic syndrome or advanced liver disease.
- Low protein with jaundice, confusion, vomiting blood or black stools: signs of liver failure or gastrointestinal bleeding that need same-day care.
- Unexplained weight loss, chronic diarrhea or night sweats alongside any protein abnormality.
- Severe dehydration with dizziness, confusion, very little urine or a racing heart, particularly in older adults or infants.
- Blurred vision, nosebleeds, headaches or confusion with a very high protein, which can indicate hyperviscosity and needs urgent assessment.
Frequently asked questions
What is a normal total protein level?
For adults, about 6.0 to 8.3 g/dL, with albumin making up 3.5 to 5.0 g/dL of that and globulins 2.0 to 3.5 g/dL. Laboratories set slightly different limits, so use the range printed on your report. Children over a year old have similar values; newborns and pregnant women run lower.
Is a total protein of 8.5 high?
It is just above most reference ranges and, on its own, is more often from dehydration, standing before the blood draw or a tight tourniquet than from disease. The useful checks are the albumin and globulin on the same panel: if albumin is high-normal and globulin is normal, it is almost certainly concentration. A repeat after normal fluid intake usually settles it; if globulin is above about 4 g/dL, protein electrophoresis is the next step.
What causes high total protein in blood?
Dehydration is the most common cause. True rises are nearly always in the globulins: chronic infection (HIV, hepatitis B or C), autoimmune disease (rheumatoid arthritis, lupus, Sjögren's), chronic liver disease, or a monoclonal protein from MGUS, multiple myeloma or Waldenström macroglobulinemia. Albumin itself rarely rises except from concentration.
What does low total protein mean?
Usually that albumin is low. The common reasons are liver disease, protein loss through the kidneys (nephrotic syndrome) or gut, poor intake or malabsorption, and the inflammation of any significant illness, which drops albumin within days. Dilution from IV fluids, pregnancy or heart failure also lowers it. A low globulin fraction is less common and suggests an immune deficiency or immunosuppressive drugs.
Does high total protein mean cancer?
Rarely. Most high results are dehydration or a polyclonal rise from infection, inflammation or liver disease. The cancer-related cause is a monoclonal gammopathy; its benign form, MGUS, affects about 3 percent of people over 50, and multiple myeloma is much less common. Myeloma usually brings total protein above 9 g/dL together with anemia, high calcium, kidney impairment or bone pain. Protein electrophoresis and free light chains sort this out.
Can dehydration raise total protein?
Yes, and it is the most common explanation for a mildly high result. Losing fluid concentrates everything in the blood, so albumin and globulins rise together while the A/G ratio stays normal; sodium, BUN and hematocrit are often raised at the same time. Rehydrate and repeat before any further testing.
Do I need to fast for a total protein test?
No. A meal does not meaningfully change total protein. It is usually drawn as part of a metabolic panel that may include glucose or lipids, which can require fasting, but the protein measurement itself does not. What does matter is being normally hydrated and seated for about 15 minutes before the draw.
How can I raise a low total protein?
Only by addressing why it is low. If intake is the problem, aim for 1.0 to 1.2 g of protein per kilogram a day spread across meals, or 1.2 to 1.5 g/kg during recovery from illness, unless you have advanced kidney disease. If the cause is inflammation, liver disease, kidney loss or a gut disorder, albumin rises only as that condition is treated; it has a 20-day half-life, so improvement shows over weeks, not days.
References
- Total protein and albumin/globulin (A/G) ratio. MedlinePlus, US National Library of Medicine (2022)View source
- Busher JT. Serum albumin and globulin. In: Clinical Methods: The History, Physical, and Laboratory Examinations, 3rd edition. Butterworths (NCBI Bookshelf) (1990)View source
- Soeters PB, Wolfe RR, Shenkin A. Hypoalbuminemia: pathogenesis and clinical significance. Journal of Parenteral and Enteral Nutrition (2019)
- Levitt DG, Levitt MD. Human serum albumin homeostasis: a new look at the roles of synthesis, catabolism, renal and gastrointestinal excretion, and the clinical value of serum albumin measurements. International Journal of General Medicine (2016)
- Kyle RA, Therneau TM, Rajkumar SV, et al.. Prevalence of monoclonal gammopathy of undetermined significance. New England Journal of Medicine (2006)
- Rajkumar SV, Dimopoulos MA, Palumbo A, et al.. International Myeloma Working Group updated criteria for the diagnosis of multiple myeloma. Lancet Oncology (2014)
- O'Connell TX, Horita TJ, Kasravi B. Understanding and interpreting serum protein electrophoresis. American Family Physician (2005)
- Bauer J, Biolo G, Cederholm T, et al.. Evidence-based recommendations for optimal dietary protein intake in older people: a position paper from the PROT-AGE Study Group. Journal of the American Medical Directors Association (2013)
- Milne AC, Potter J, Vivanti A, Avenell A. Protein and energy supplementation in elderly people at risk from malnutrition. Cochrane Database of Systematic Reviews (2009)
- Multiple myeloma. Merck Manual Professional Version (2024)
- Overview of nephrotic syndrome. Merck Manual Professional Version (2024)
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