Collection Notes: Serum is the recommended sample type. Grossly hemolyzed or grossly lipemic specimens are not acceptable.
Clinical Utility: A deficiency of IgG subclasses is often observed in patients with recurring infections of the upper and lower respiratory passages. IgG subclass 4 is used to evaluate sinopulmonary infections, asthma.
Serum (1 mL)
Ambient 72 Hours
Refrigerated 7 Days
Frozen 3 Months
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