Total Protein
Test Overview
The Total Protein Test measures the combined levels of albumin and globulin in the blood. Proteins play a crucial role in various bodily functions, including immune response, enzyme activity, and fluid balance. This test is often included in a comprehensive metabolic panel (CMP) to help assess liver function, kidney function, and nutritional status. Abnormal protein levels may indicate liver disease, kidney disease, malnutrition, or inflammatory conditions.
Test Types
- Total Protein Test: Measures the total concentration of albumin and globulin in the blood.
- Albumin Test: Measures the amount of albumin, a protein made by the liver that maintain fluid balance.
- Globulin Test: Measures the amount of globulin, a group of proteins in immune function and blood clotting.
- Albumin/Globulin (A/G) Ratio: Evaluates the balance between albumin and globulin, which can help identify certain medical conditions.
Total Protein Test Results & Ranges
| Test Component: | Normal Range: | Abnormal (Possible Conditions): |
|---|---|---|
| Total Protein | 6.0–8.3 g/dL | High: Chronic inflammation, infections, multiple myeloma, dehydration Low: Liver disease, kidney disease, malnutrition, immune disorders |
| Albumin/Globulin (A/G) Ratio | 1.0–2.1 | Low A/G Ratio: Liver disease, kidney disease, autoimmune diseases High A/G Ratio: Genetic disorders, some leukemias |
Expected Turnaround Time
- Results Available: 1–2 business days
Specimen Requirements
- Sample Type: Blood sample (venipuncture)
- Container: Serum separator tube (SST) or plain tube
Collection Instructions:
- Fasting is not required for this test.
- Avoid dehydration before the test, as it can cause artificially high protein levels.
- Inform your healthcare provider of any medications you are taking, as certain drugs (e.g., steroids, androgens, estrogens) may affect protein levels.
- Storage: Blood samples should be processed promptly and stored according to lab protocols, typically refrigerated or at room temperature until testing.
Test Details
Clinical Use: Assesses liver and kidney function: Helps detect liver disease (cirrhosis, hepatitis) and kidney disease (nephrotic syndrome). Evaluates nutritional status: Low protein levels can indicate malnutrition or malabsorption disorders. Detects inflammatory and immune disorders: High protein levels may suggest chronic inflammation, autoimmune diseases, or multiple myeloma.
Limitations: Total protein levels alone do not pinpoint a specific disease and must be interpreted alongside albumin, globulin, and other tests. Temporary fluctuations in protein levels can occur due to hydration status, recent illness, or medication use. Further testing, such as serum protein electrophoresis (SPEP), may be needed if abnormal total protein levels are detected.
The Total Protein Test is an essential tool in evaluating liver and kidney function, immune health, and nutritional status, helping to diagnose a range of medical conditions.