This is a Proprietary Laboratory Analyses (PLA) code, meaning that the code applies to only one unique lab test made by a specific manufacturer or performed by a specific lab. Report 0521U only for Seronegative Rheumatoid Arthritis Panel from KSL Diagnostics–Beutner Laboratories Inc. and KSL Biomedical Inc. This test helps in diagnosing rheumatoid arthritis by measuring levels of rheumatoid factor IgA and IgM, cyclic citrullinated peptide (CCP) antibodies, and scavenger receptor A (SR–A) using immunoassay technology.
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