Immunoglobulin A, (IgA) Quantitative
Fasting Required: No

Specimen: Blood

Lab: Quest Diagnostics

Results: 2-3 business days
Note: Result turnaround times are an estimate and are not guaranteed. Our reference lab may need additional time due to weather, holidays, confirmation/repeat testing, or equipment maintenance.

Limitations: IgA-deficient individuals may have circulating IgA antibodies that can mediate fatal anaphylactoid reactions if IgA is infused or transfused. The absence IgA antibodies does not necessarily indicate the patient may not suffer anaphalaxis because pre-existing antibodies to other serum proteins may exist and cause anaphalaxis.

Description: IgA is found in high concentrations in the body's mucous membranes, particularly the respiratory passages and gastrointestinal tract, as well as in saliva and tears.

IgA also plays a role in allergic reactions. Levels rise in response to the presence of allergens, such as pet dander, in sensitive people. IgA levels may also be high in autoimmune conditions(disorders in which the body mistakenly makes antibodies against healthy tissues).

Alternative Name(s): Immunoglobulin A