CPT® Code 83883

Nephelometry is a specialized laboratory technique utilized primarily in the field of immunology to quantitatively measure the concentration of specific proteins, known as globulins, in biological samples such as blood or urine. This method involves the detection of light that is scattered at an angle as it passes through a sample solution. The degree of light scattering is directly proportional to the concentration of the analyte present in the sample, allowing for precise quantification. The CPT® Code 83883 is specifically designated for nephelometric testing of analytes that do not have a more specific coding designation. This code is applicable for various tests that assess different proteins, including but not limited to Kappa/Lambda Quantitative Free Light Chains, Alpha-1-Microglobulin, Alpha-1-Macroglobulin, and Retinol Binding Protein. Each of these tests serves critical diagnostic purposes, such as monitoring plasma cell disorders, identifying renal tubular injury, diagnosing nephrotic syndrome, and evaluating nutritional health related to Vitamin A levels. It is important to report this code for each analyte tested using nephelometry when no specific code exists for that analyte, ensuring accurate billing and documentation in laboratory services.