Immunoglobulin A
The antibody class that guards the surfaces the outside world touches -- gut, airways and tears.
The antibody class that guards the surfaces the outside world touches -- gut, airways and tears.
Selective deficiency of it is the commonest antibody deficiency there is, and often causes no symptoms at all.
A low value matters mainly for two practical reasons: it raises the risk of gut and chest infections, and it invalidates the standard coeliac blood test, which is IgA-based -- so a coeliac screen is interpreted differently in anyone with low IgA.
Worth mentioning a low value before any coeliac testing.
On a report in another language.
A lab report names this analyte in its own language. Vitals Vault recognises each of these and files them all under Immunoglobulin A.
Catalog entry last updated 2026-08-28. Browse all 165 metrics.