What should you know about an IgA blood test?

A clinician interprets IgA using the laboratory range, your age, symptoms, medicines, and other blood results. A raised or low value can have several explanations and does not establish a diagnosis alone. IgA testing may be included when investigating [Coeliac Disease](/conditions/coeliac-disease/), recurrent infections, digestive symptoms, or broader immune concerns. Other conditions, including [Crohn's Disease](/conditions/crohns-disease/) or [Chronic Fatigue Syndrome](/conditions/chronic-fatigue-syndrome/), require assessment beyond one antibody result.

Check whether the request includes other tests that require fasting, and follow the laboratory instructions. Tell the clinician about medicines, supplements, pregnancy, and recent illness. If IgA is being used as part of coeliac testing, ask whether changing your diet before testing could affect the assessment. Keep the report and discuss the actual value, units, and reference range rather than relying on a high or low label alone.

Book follow-up with the ordering clinician for an unexpected IgA result or symptoms such as persistent diarrhoea, abdominal discomfort, repeated infections, prolonged fever, or unexplained tiredness. Seek urgent help for breathing difficulty, facial swelling, collapse, severe dehydration, or rapidly worsening illness. A clinician may use additional tests when considering [Anaemia](/conditions/anaemia/), [Chronic Kidney Disease](/conditions/chronic-kidney-disease/), or [Glandular Fever](/conditions/glandular-fever/).

Ask why IgA was ordered, whether the result is within this laboratory's range, whether total IgA affects another test, and what follow-up is appropriate. Ask which symptoms should prompt earlier contact.