Serum/plasma total protein concentration (mass concentration)

Your doctor may order this test as part of a routine health checkup or to help find the cause of symptoms such as fatigue, swelling in your legs or abdomen, unexplained weight loss, or frequent infections. The test measures the total amount of protein in your blood, which helps show how well your liver, kidneys, and immune system are working and whether your body is getting adequate nutrition.

Your healthcare provider may order this test to check for conditions affecting protein levels, such as malnutrition, kidney disease, liver problems, or certain infections. It can also help diagnose or monitor conditions like nephrotic syndrome or protein-losing gastrointestinal disorders.

Very little preparation is needed for this simple blood test. You can usually eat and drink normally before your appointment, but be sure to tell your doctor about any prescription medicines, vitamins, or supplements you take, since some drugs can affect your results. Wear a shirt with a sleeve that can be rolled up easily so the person drawing your blood can reach a vein in your arm.

No special preparation is usually needed, but you may be asked to fast for 8–12 hours before the test if it’s part of a liver or kidney function panel. Avoid excessive alcohol or certain medications that could affect protein levels.

A health care professional will wrap a band around your upper arm, clean the skin at the inside of your elbow, and insert a small needle into a vein to collect a sample of blood. You may feel a quick sting or pinch when the needle goes in, and the area may be slightly tender afterward. The sample is then sent to a laboratory for analysis, and the entire process usually takes only a few minutes.

A healthcare professional will draw blood from a vein in your arm. You may feel a slight pinch, but it usually doesn’t cause discomfort. The blood sample is then sent to a lab for analysis.

Your total protein results are compared with a standard reference range used by the laboratory, which for healthy adults is typically about 6.0 to 8.3 grams per deciliter (g/dL) of blood. Your doctor will interpret your specific value together with your age, medical history, current medicines, and the results of other tests to determine whether your protein level is within a normal range for you.

Results are compared to a standard range of protein concentrations in healthy adults, though exact values can vary by lab. Abnormal results may prompt further testing to identify underlying causes.