This is a Proprietary Laboratory Analyses (PLA) code, meaning that the code describes only one unique lab test made by a specific manufacturer or performed by a specific lab. Code 0039U describes the anti–dsDNA, high salt/avidity laboratory tests from the University of Washington, Department of Laboratory Medicine, which is a test for salt–resistant antibodies to double–stranded DNA, which is predictive of systemic lupus erythematosus disease activity.
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