Protein Electrophoresis, Urine

Protein Electrophoresis, Urine

What it is

The Protein Electrophoresis, Urine test separates and measures proteins present in the urine using an electrical field. Normally, only small amounts of protein are found in urine. Larger or abnormal proteins in urine may indicate kidney damage, multiple myeloma, or other plasma cell disorders. This test helps detect and characterize abnormal protein patterns, particularly the presence of monoclonal proteins (M-proteins or Bence Jones proteins).

Uses

This test is used to:
– Detect monoclonal light chains (Bence Jones proteins) in multiple myeloma.
– Monitor patients with plasma cell disorders such as Waldenström’s macroglobulinemia or MGUS (Monoclonal Gammopathy of Undetermined Significance).
– Evaluate kidney function and protein loss.
– Assess unexplained proteinuria found on routine urinalysis.
– Differentiate between glomerular, tubular, and overflow causes of proteinuria.

Symptoms That May Lead to the Test

Doctors may recommend urine protein electrophoresis if you have:
– Unexplained fatigue, bone pain, or fractures.
– Persistent proteinuria (protein in urine).
– Swelling in the legs, ankles, or around the eyes (edema).
– Recurrent infections or unexplained weight loss.
– Signs of kidney disease or abnormal blood protein levels.

Abnormal Results

Monoclonal Protein (M-protein/Bence Jones Protein): Suggests multiple myeloma, light chain disease, or other plasma cell disorders.

Polyclonal Proteinuria: May indicate chronic infections, autoimmune disease, or inflammation.

High Protein Levels: May result from kidney disease (nephrotic syndrome, glomerulonephritis) or overflow from plasma cell disorders.

Abnormal results are usually confirmed with additional tests such as immunofixation electrophoresis (IFE) or serum free light chain assay.

Risks

The test is non-invasive and requires only a urine sample (random or 24-hour collection). There are no direct risks, though accurate results depend on proper collection and handling of the sample.