Total Protein
Also known as: Serum Protein
What Does Total Protein Measure?
Total protein is a blood test that measures the combined amount of two major types of proteins found in your blood: albumin and globulins. Albumin is made by the liver and helps carry substances like hormones, vitamins, and drugs through the bloodstream, while also maintaining fluid balance in the body. Globulins include a range of proteins such as immune antibodies, clotting factors, and transport proteins. The test is typically reported in grams per deciliter (g/dL) and reflects the overall protein content circulating in your plasma.
Why Does Total Protein Matter?
Total protein levels serve as an important indicator of your body's overall nutritional status, liver function, kidney health, and immune system activity. Abnormal levels can signal a wide range of conditions, from malnutrition and liver disease to kidney disorders and certain cancers such as multiple myeloma. Because proteins are essential for nearly every biological function — including tissue repair, enzyme activity, hormone production, and immune defense — a total protein test is often one of the first screening tools used during a routine comprehensive metabolic panel (CMP) to detect underlying health problems.
Normal Ranges
Males
6.3 - 8.2 g/dL
Females
6.3 - 8.2 g/dL
Children
Varies by age: newborns 4.6–7.4 g/dL; ages 1–5: 6.1–7.9 g/dL; ages 6–18: 6.3–8.2 g/dL
Causes of High Levels
- Dehydration – when blood volume decreases, protein concentration artificially rises
- Multiple myeloma or other plasma cell disorders – abnormal production of immunoglobulins
- Chronic infections or inflammatory diseases – elevated immune globulins (e.g., HIV, hepatitis, tuberculosis)
- Autoimmune conditions such as lupus or rheumatoid arthritis – increased antibody production
- Sarcoidosis – granulomatous disease driving excess globulin production
- Chronic liver disease (early stages) – overproduction of acute-phase proteins and globulins
Causes of Low Levels
- Malnutrition or inadequate dietary protein intake – insufficient raw materials for protein synthesis
- Liver disease (advanced cirrhosis or hepatitis) – reduced albumin synthesis by damaged liver cells
How to Improve Your Total Protein
Diet
- Increase high-quality complete protein intake: aim for 0.8–1.2 g of protein per kilogram of body weight daily from sources like lean meats, poultry, fish, and eggs
- Include plant-based protein sources such as legumes (lentils, chickpeas, black beans), tofu, and quinoa to diversify amino acid intake
- Consume dairy products like Greek yogurt, cottage cheese, and milk, which are rich in both albumin-supporting amino acids and calcium
- Avoid excessive alcohol consumption, as alcohol impairs liver function and reduces albumin synthesis
- Ensure adequate caloric intake overall — insufficient calories force the body to use protein for energy rather than tissue maintenance
Supplements
- Whey protein powder: 20–40 g per day can help boost protein intake, particularly for individuals with low appetite or malabsorption
- Essential amino acid (EAA) supplements: 5–10 g per serving can support albumin and globulin synthesis when dietary intake is inadequate
- Vitamin B6 (pyridoxine): 1.3–2 mg/day supports amino acid metabolism and protein utilization
- Zinc: 8–11 mg/day supports immune globulin production and overall protein synthesis
Related Biomarkers
Frequently Asked Questions
What does it mean if my total protein is low?
A low total protein level (below 6.3 g/dL) often suggests that your body is either not getting enough protein through your diet, not absorbing it properly, losing it abnormally (such as through the kidneys in nephrotic syndrome), or not producing enough due to liver damage. It can also occur with fluid overload, where extra fluid in the blood dilutes protein concentrations. Your doctor will typically look at albumin and globulin levels separately, along with other tests, to determine the underlying cause.
Can dehydration affect my total protein results?
Yes, dehydration is a common reason for a falsely elevated total protein result. When your body is dehydrated, the volume of liquid in your blood decreases, but the amount of protein stays the same — making the concentration appear higher than it truly is. This is called hemoconcentration. Drinking adequate water and being well-hydrated before your blood draw can help ensure more accurate results.
Is a high total protein level always a sign of disease?
Not necessarily. Mild elevations can sometimes be due to dehydration or laboratory variation. However, persistently high levels — especially when accompanied by elevated globulins — can indicate conditions like multiple myeloma, chronic infections, autoimmune diseases, or inflammatory conditions. If your total protein is elevated, your doctor will likely order follow-up tests such as a protein electrophoresis (SPEP) to identify which specific protein fraction is elevated and why.