Total Protein — Normal Range & Interpretation

Clinical Context

Total protein measures the combined concentration of albumin and globulins in serum. Albumin maintains oncotic pressure and transports hormones, drugs, and bilirubin, while globulins include immunoglobulins and acute-phase reactants. Clinicians use total protein alongside albumin and the A/G ratio to assess hepatic synthetic function, nutritional status, and immunologic activity.

Elevated total protein points to chronic inflammation, chronic infection, multiple myeloma, Waldenström macroglobulinemia, or dehydration that concentrates serum proteins. Depressed total protein reflects hepatic dysfunction with reduced synthesis, protein-losing states such as nephrotic syndrome and protein-losing enteropathy, malnutrition, malabsorption, severe burns, and overhydration. An inverted A/G ratio with normal or elevated total protein raises concern for a monoclonal gammopathy and warrants serum protein electrophoresis.

Board-style questions on total protein pair the value within the hepatic panel, the distinction between decreased albumin and elevated globulins as drivers of abnormal results, and the link between low total protein and edema from reduced oncotic pressure. Expect vignettes pairing low albumin with ascites or peripheral edema in cirrhosis, low total protein with proteinuria in nephrotic syndrome, and elevated total protein with bone pain or hypercalcemia pointing toward multiple myeloma and the need for SPEP referral.

Related Labs

• AST (SGOT) — U/L
• ALT (SGPT) — U/L
• ALP — U/L
• Total Bilirubin — mg/dL
• Direct Bilirubin — mg/dL

Sources

• MedlinePlus