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 0042U describes the Lyme ImmunoBlot IgG from IGeneX Inc, which detects IgG antibodies to 12 recombinant protein groups to identify Borrelia (B.) burgdorferi, a tick–borne bacteria that causes Lyme disease.
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