Increase in IgG4:
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IgG subclasses (immunoglobulin G subclasses) (1,2,3,4)
Subclass 1: 240–1120 mg/dL; subclass 2: 125–550 mg/dL; subclass 3: 20–135 mg/dL; subclass 4: 7–90 mg/dL
Separate serum or plasma from cells ASAP or within 2 hrs of collection, and refrigerate.