The Bence Jones Protein (BJP) test detects abnormal proteins (free light chains of immunoglobulins) in the urine. These proteins are produced by plasma cells and are often associated with multiple myeloma and other plasma cell disorders. Normally, these proteins are filtered by the kidneys and excreted in very small amounts.

Purpose of the Test

• Diagnosis and Monitoring of Plasma Cell Disorders: Detects conditions like multiple myeloma, Waldenström macroglobulinemia, and amyloidosis.
• Evaluate Kidney Function: Checks for kidney damage caused by abnormal proteins.
• Monitor Disease Progression: Assesses response to treatment for plasma cell disorders.

Risk Assessment – Conditions Associated with Positive Bence Jones Protein

1. Multiple Myeloma – Most common cause.
2. Waldenström Macroglobulinemia – Rare lymphoma producing excess immunoglobulins.
3. Light Chain Amyloidosis – Light chains misfold and deposit in organs.
4. Chronic Lymphocytic Leukemia (CLL) – May produce light chains in rare cases.
5. Plasma Cell Leukemia – Aggressive plasma cell cancer.

Normal Range

• Normal/Negative: No detectable Bence Jones protein.
• Abnormal/Positive: Any detectable level may indicate disease and requires further evaluation.

Interpretation of Results

• Negative/Normal: No detectable Bence Jones proteins in urine.
• Positive: Presence of Bence Jones proteins suggests plasma cell dyscrasia or related disorders. Further testing (serum free light chain assay, urine protein electrophoresis) is required for diagnosis.

Quantitative Results:

• Trace/Low Levels: May indicate benign conditions or early disease.
• Moderate to High Levels: Suggestive of multiple myeloma or other malignant plasma cell disorders.

Sample Type

• 24-Hour Urine Collection (preferred for accuracy).
• Random Urine Sample (less precise but useful for screening).