Serum IgA test measures the amount of Immunoglobulin A (IgA) in the blood. IgA is an antibody that plays a key role in immune defense, especially in the respiratory and gastrointestinal mucosa.

Risk Assessment :

• To evaluate immune system function

• To investigate recurrent sinus, lung, or gastrointestinal infections

• To help diagnose autoimmune diseases (e.g., celiac disease)

• To assess for IgA deficiency

• To evaluate certain blood disorders (e.g., multiple myeloma)

Normal Range

• Adults: 70–400 mg/dL
• Children: 20–200 mg/dL
  (Note: Reference ranges may vary slightly by laboratory.)

Interpretation:

• High IgA: May indicate chronic infections, liver disease (cirrhosis), inflammatory bowel disease, autoimmune disorders, or plasma cell disorders.

• Low IgA: Suggests IgA deficiency, which can cause recurrent respiratory and GI infections or may be associated with celiac disease and allergic conditions.

• Very Low or Absent IgA: Known as Selective IgA Deficiency.

Sample Type

• Blood sample: Collected via venipuncture (most common).
• Other fluids: Sometimes saliva or cerebrospinal fluid (CSF) is used for specialized cases.

• Report Delivery Time:

  • • Usually same day to 24 hours depending on the lab.