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To evaluate humoral immunity, monitor therapy in myeloma. To evaluate malabsorption syndrome, giardiasis, and lactase deficiency. IgA deficiencies are associated with a high incidence of autoimmune disease. Isolated IgA deficiency is usually associated with chronic respiratory infections and allergies. IgA may be elevated in any disease affecting mucosal surfaces. IgA and IgE may be low in ataxia telangiectasia.
Cord blood (age <1 mos): 1 - 4 mg/dL, age 1 mos: 2 - 50 mg/dL, age 2-9 mos: 4 - 80 mg/dL, age 10-11 mos: 15 - 90 mg/dL, age 1-4 yrs: 15 - 160 mg/dL, age 5-11 yrs: 35 - 250 mg/dL, age 12-150 yrs: 40 - 350 mg/dL.
* Reference ranges may change over time. Please refer to the original patient report when evaluating results.
Collect specimen in SST tube. Centrifuge, aliquot serum into a plastic vial and refrigerate. Store at 2-8°C up to 8 days.
Samples may be frozen at -20°C or below for up to 3 months if they are frozen within 24 hours after collection.