This test measures the level of kappa free light chains, small protein fragments produced by plasma cells.
Diagnostic Value: Elevated kappa light chains may indicate abnormal immunoglobulin production associated with plasma cell disorders such as multiple myeloma or monoclonal gammopathy, which can damage kidneys over time.
Clinical Significance: Monitoring kappa light chains helps detect early renal involvement in protein disorders and guides therapy to prevent irreversible kidney injury.
Symptom Correlation: High levels may cause fatigue, bone pain, frequent urination, or swelling due to renal stress from excess protein load.
Because they reveal abnormal protein filtration and immune dysregulation, kappa light chain testing is key for identifying kidney complications related to plasma cell disorders.