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Quick Take
- What it measures: The total protein blood test measures the combined amount of albumin and globulin proteins in the liquid part of your blood.
- Why it is ordered: It is commonly included in a comprehensive metabolic panel and may help evaluate liver function, kidney problems, nutritional status, inflammation, infection, and certain immune or blood disorders.
- Typical reference range: Many labs use a total protein range around 6.0–8.3 g/dL, but ranges vary by laboratory, age, method, and specimen type.
- Preparation: A standalone total protein test usually does not require fasting. If it is part of a CMP or another panel, you may be told to fast for several hours.
- Important limitation: A high or low total protein result does not diagnose a condition by itself. Your clinician usually interprets it with albumin, globulin, A/G ratio, liver enzymes, kidney markers, urine protein testing, symptoms, and prior results.
What is a total protein blood test?
A total protein blood test measures the combined concentration of the major proteins circulating in your blood plasma or serum. The two broad groups are albumin and globulins. Albumin is made by the liver and helps keep fluid inside blood vessels while carrying hormones, medicines, vitamins, and other substances. Globulins include many proteins involved in immune defense, transport, inflammation, and blood clotting. MedlinePlus describes the total protein and albumin/globulin ratio test as a way to measure these proteins and compare albumin with globulin.
Total protein is often reported as part of a comprehensive metabolic panel or a liver-related blood panel. You may see it on your lab report as “protein, total,” “total serum protein,” “TP,” or “total protein with A/G ratio.” In many reports, the lab also lists albumin, calculated globulin, and the albumin-to-globulin ratio, often shortened to A/G ratio.
The test is not a “high-protein diet” test. Eating more protein does not usually translate into a high blood total protein result. Instead, abnormal values more often reflect hydration status, liver production of proteins, protein loss through the kidneys or digestive tract, inflammation, infection, immune protein changes, or broad nutritional and metabolic issues.
What the test measures: albumin, globulin, and A/G ratio
Total protein is the sum of albumin plus globulins. Because albumin is usually the largest single protein fraction, a low albumin level can pull the total protein level down even when other proteins are normal. Globulins are a mixed group; some are made by the liver, while many immune-related globulins are made by immune cells. Mayo Clinic Laboratories notes that plasma proteins are synthesized mainly in the liver, while immunoglobulins are produced by cells in lymph nodes, spleen, and bone marrow.
| Result on your report | What it represents | Why it matters |
|---|---|---|
| Total protein | Albumin + globulin proteins in blood | Broad screen for protein balance, hydration effects, liver/kidney disease, nutrition, inflammation, or immune protein changes |
| Albumin | A liver-made protein that helps maintain blood vessel fluid balance and transports substances | Can be low with liver disease, kidney protein loss, inflammation, malnutrition, malabsorption, or severe illness |
| Globulin | A group of proteins including antibodies and other transport or inflammatory proteins | Can shift with infection, inflammation, autoimmune disease, immune deficiency, liver disease, or plasma-cell disorders |
| A/G ratio | Albumin divided by globulin | Helps show whether an abnormal total protein result is driven more by albumin, globulin, or both |
Why a total protein blood test may be ordered
Clinicians order total protein for two main reasons: as part of a routine chemistry panel and as part of an evaluation for symptoms or conditions that may affect protein levels. UCSF Health notes that the test is often used when evaluating nutritional problems, kidney disease, or liver disease, and that abnormal total protein usually requires more testing to identify the cause.
You may see total protein checked if you have:
- Swelling in the feet, ankles, legs, face, or abdomen
- Unexplained fatigue, appetite loss, weight loss, nausea, or vomiting
- Jaundice, dark urine, pale stools, or other possible liver-related symptoms
- Foamy urine, blood in the urine, high blood pressure, or suspected kidney disease
- Known chronic liver disease, kidney disease, inflammatory disease, autoimmune disease, or malabsorption
- Abnormal albumin, globulin, calcium, creatinine, liver enzymes, or urine protein results
- A need to monitor an ongoing condition or compare a new result with prior baseline labs
Total protein is useful because it is inexpensive, widely available, and interpretable in context. It is not specific, however. Many unrelated conditions can produce similar total protein patterns, which is why it is commonly used as a starting point rather than a final answer.
How to prepare for a total protein blood test
A standalone total protein test is a routine venous blood draw. A phlebotomist usually collects blood from a vein in your arm, and the draw itself often takes only a few minutes. Most people do not need special preparation for total protein alone.
Preparation depends on what else is being tested at the same time:
- If total protein is ordered by itself: fasting is usually not required unless your clinician or lab gives specific instructions.
- If it is part of a comprehensive metabolic panel: some ordering clinicians ask for fasting, especially if glucose or other fasting-sensitive markers are included.
- If other tests are ordered: follow the strictest instruction for the full panel, not just the total protein component.
Tell your clinician about prescription medications, over-the-counter drugs, supplements, and recent IV fluids. MedlinePlus advises that certain medicines may need to be considered before testing, but you should not stop a medication unless your healthcare provider tells you to.
Before the blood draw
- Drink water normally unless you have been told to restrict fluids.
- Bring your lab order and insurance card if applicable.
- Ask whether fasting is required for the complete panel.
- Let the collector know if you have fainted during blood draws before.
- Ask when and how results will be released.
How to read total protein results
Total protein is usually reported in grams per deciliter, written as g/dL. Some reports use grams per liter, written as g/L. To convert g/dL to g/L, multiply by 10. For example, 7.0 g/dL equals 70 g/L.
A commonly cited adult reference range is about 6.0–8.3 g/dL, but you should use the reference interval printed next to your own result. UCSF Health lists 6.0–8.3 g/dL as a normal range and emphasizes that normal value ranges may vary among laboratories.
| Pattern | Possible interpretation | What to check next |
|---|---|---|
| Total protein normal | Protein concentration is within that lab’s expected interval | Review albumin, globulin, A/G ratio, symptoms, and prior trends |
| Total protein high | May reflect dehydration, increased immune proteins, chronic inflammation, infection, liver disease, or plasma-cell disorders | Albumin vs. globulin pattern, CBC, liver tests, kidney tests, inflammatory markers, serum protein electrophoresis if indicated |
| Total protein low | May reflect low albumin, protein loss, reduced production, dilution from fluids, malnutrition, malabsorption, kidney disease, liver disease, or severe illness | Albumin, urine protein/albumin, CMP, liver enzymes, kidney function, stool or GI evaluation if protein loss is suspected |
| A/G ratio low or high | May point toward a relative albumin or globulin imbalance | Compare with absolute albumin and globulin values; consider electrophoresis or immunoglobulin testing when appropriate |
A slightly out-of-range result may be temporary, especially if you were dehydrated, recently ill, receiving IV fluids, pregnant, or hospitalized. A persistent or more marked abnormality is more likely to prompt repeat testing or additional evaluation.
What high or low total protein can mean
High total protein
High total protein is sometimes caused by hemoconcentration, meaning the liquid portion of blood is reduced and proteins appear more concentrated. Dehydration from inadequate fluid intake, vomiting, diarrhea, or other fluid loss can cause this pattern. Mayo Clinic Laboratories describes changes in plasma water volume as one of the two broad reasons total protein changes; the other is a change in one or more specific protein fractions.
When hydration does not explain the result, high total protein may reflect increased globulins. This can occur with chronic inflammation, infections, autoimmune conditions, chronic liver disease, or increased monoclonal proteins. Labcorp’s test information lists dehydration, chronic liver disease, myeloma, Waldenström macroglobulinemia, granulomatous disease, autoimmune disease, and chronic infection/inflammation among possible causes of high total protein.
A high total protein result does not mean you have cancer. It means the pattern deserves context. If globulin is high or the A/G ratio is low, a clinician may consider serum protein electrophoresis, immunofixation, quantitative immunoglobulins, or related testing to separate protein fractions and look for broad immune activation versus a monoclonal protein pattern.
Low total protein
Low total protein often reflects low albumin, low globulins, dilution from fluid shifts, or protein loss. Possible causes include liver disease, kidney disease, malnutrition, malabsorption, protein-losing enteropathy, burns, severe inflammation, and some immune deficiencies. Labcorp notes that very low total protein with low albumin can contribute to edema, including in nephrotic syndromes.
Kidney-related protein loss is a common reason clinicians pair blood protein results with urine testing. In nephrotic syndrome, the kidney filters leak too much protein into the urine, which can lead to low blood albumin and swelling. The National Institute of Diabetes and Digestive and Kidney Diseases describes nephrotic syndrome as a group of findings that includes too much protein in the urine, low blood albumin, swelling, and often high cholesterol.
Low total protein can also occur when the body is not making enough proteins. Because the liver makes albumin and many other plasma proteins, chronic or advanced liver disease can lower albumin and sometimes total protein. Malabsorption conditions, inflammatory bowel disease, inadequate intake, or severe illness can also lower protein stores or increase protein loss.
Follow-up tests and practical next steps
If your total protein result is abnormal, the next step is usually not one single test. It is a pattern review. Your clinician may compare your total protein with albumin, globulin, A/G ratio, liver enzymes, bilirubin, creatinine, estimated glomerular filtration rate, calcium, complete blood count, urine albumin or urine protein, and prior lab results.
| Follow-up test | Why it may be used |
|---|---|
| Albumin blood test | Helps determine whether low total protein is mainly albumin-driven |
| Comprehensive metabolic panel | Checks total protein with liver enzymes, bilirubin, kidney markers, electrolytes, calcium, and glucose |
| Urinalysis or urine protein/albumin testing | Looks for protein loss through the kidneys |
| Serum protein electrophoresis | Separates protein fractions when globulin changes, high total protein, or low A/G ratio need clarification |
| Immunofixation or quantitative immunoglobulins | Further evaluates abnormal immune protein patterns when clinically indicated |
| Liver-focused testing | May include ALT, AST, alkaline phosphatase, bilirubin, PT/INR, hepatitis testing, or imaging depending on the situation |
When you receive your result, write down the exact value, the lab’s reference range, whether albumin and globulin were abnormal, and whether the result is new or longstanding. A single mild abnormality with no symptoms may be repeated before extensive testing. A significant abnormality, a worsening trend, or symptoms such as swelling, jaundice, unexplained weight loss, persistent fever, severe fatigue, blood in urine, or shortness of breath should be discussed promptly with a healthcare professional.
Cost and self-pay considerations
Total protein is a low-cost chemistry test when ordered on its own, but many people encounter it as part of a CMP, hepatic function panel, or annual lab package. Your out-of-pocket cost depends on who orders it, whether insurance is billed, whether a blood draw fee is charged, and whether physician authorization or review is bundled into the purchase.
If a clinician orders the test through insurance, your cost may be a copay, deductible amount, coinsurance, or nothing, depending on your plan and medical necessity rules. If you buy testing directly, compare the effective total cost: listed test price plus physician service fees, draw fees, processing fees, shipping if any, and whether the same purchase includes albumin, globulin, or a broader CMP.
| Ordering route | What to compare | Consumer notes |
|---|---|---|
| Doctor-ordered, insurance billed | Copay, deductible, network status, diagnosis coverage, lab network | Often best when results need clinical follow-up or when testing is medically necessary |
| Direct-to-consumer CMP | Panel price, required physician service fee, appointment availability, state restrictions | Quest Health lists a CMP at $49 plus a $6 physician service fee and states that direct purchases are not billed to insurance; the CMP includes total protein and A/G-related information. See Quest Health’s CMP page. |
| Direct standalone total protein | Standalone price, whether albumin/A/G ratio is included, draw fee, lab network | May be inexpensive, but a standalone result can be harder to interpret without albumin, globulin, kidney, and liver markers |
| Hospital outpatient lab, self-pay | Facility charge, venipuncture charge, prompt-pay discount, estimate vs. final bill | Ask for a written estimate and whether separate professional or collection fees apply |
For most people, a CMP provides more useful context than total protein alone because it includes kidney and liver markers that help explain abnormal protein results. If you already have a clinician involved, ask which panel is appropriate rather than buying duplicate tests.
Limitations of the total protein blood test
Total protein is a broad marker, not a diagnosis. It can be influenced by hydration, body position, pregnancy, IV fluids, acute illness, chronic inflammation, and technical factors related to blood collection. Mayo Clinic Laboratories notes that hemoconcentration and hemodilution can shift total protein by changing plasma water volume rather than changing the true amount of individual proteins.
Another limitation is that total protein can look normal even when a specific protein fraction is abnormal. For example, albumin may be low while globulins are high, producing a total protein value that appears near normal. Conversely, a mild high total protein may be less concerning if it is explained by dehydration and normalizes on repeat testing. This is why albumin, globulin, A/G ratio, and clinical context matter.
FAQs about the total protein blood test
Is total protein the same as albumin?
No. Albumin is one major part of total protein. Total protein includes albumin plus globulins. A low total protein result may be driven by low albumin, low globulins, dilution, or protein loss.
Do I need to fast for a total protein blood test?
Usually not for total protein alone. If total protein is part of a CMP or another panel, your clinician or lab may ask you to fast for several hours. Follow the instructions for the full set of tests.
What is a normal total protein level?
Many laboratories use an adult range near 6.0–8.3 g/dL, but reference intervals vary. Always compare your result with the range printed on your report.
What does high total protein mean?
High total protein may be related to dehydration, chronic inflammation, infection, autoimmune disease, chronic liver disease, or increased immune proteins. Sometimes follow-up testing such as serum protein electrophoresis is used to identify the pattern.
What does low total protein mean?
Low total protein may be related to low albumin, liver disease, kidney protein loss, malnutrition, malabsorption, protein-losing enteropathy, severe burns, inflammation, or dilution from fluids. The next step depends on albumin, globulin, urine protein, kidney markers, liver tests, and symptoms.
Can dehydration affect total protein?
Yes. Dehydration can make total protein appear higher because blood is more concentrated. If dehydration is suspected, a clinician may interpret the result with BUN, creatinine, electrolytes, albumin, and the clinical situation.
Does a high-protein diet cause high total protein in blood?
Usually no. Blood total protein is regulated by liver production, immune proteins, fluid balance, and protein loss. A high-protein diet alone is not a typical cause of high blood total protein.
When should I contact a healthcare professional?
Contact a healthcare professional if your result is clearly abnormal, worsening over time, or paired with swelling, jaundice, unexplained weight loss, persistent fever, severe fatigue, blood in urine, foamy urine, abdominal swelling, or known liver or kidney disease.
Sources
- MedlinePlus: Total Protein and Albumin/Globulin (A/G) Ratio
- UCSF Health: Total Protein
- Mayo Clinic Laboratories: Protein, Total, Serum
- Labcorp: Protein, Total
- NIDDK: Nephrotic Syndrome in Adults
- Quest Health: Comprehensive Metabolic Panel
