Increase in IgG4:

Increase in IgG4: is a topic covered in the Guide to Diagnostic Tests.

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Test/Range/Collection

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

Age-dependent

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SST, green

Separate serum or plasma from cells ASAP or within 2 hrs of collection, and refrigerate.

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