Immunoglobulin A

Immunglobulin A (IgA) levels decrease in primary and secondary immunodeficiency syndromes. Increased values occur e.g. in severe infections and autoimmune diseases.

Reference Ranges

Adults
70 – 400 mg/dL4.38 – 25 µmol/L
Children
< 1 month7 – 94 mg/dL0.44 – 5.88 µmol/L
1 – 12 months10 – 131 mg/dL0.63 – 8.19 µmol/L
1 – 3 years19 – 220 mg/dL1.19 – 13.8 µmol/L
4 – 5 years48 – 345 mg/dL3 – 21.6 µmol/L
6 – 7 years41 – 297 mg/dL2.56 – 18.6 µmol/L
8 – 10 years51 – 297 mg/dL3.19 – 18.6 µmol/L
11 – 13 years44 – 395 mg/dL2.75 – 24.7 µmol/L
Each laboratory should check if the reference ranges are transferable to its own patient population and determine own reference ranges if necessary. For diagnostic purposes, the results should always be assessed with the patient’s medical history, clinical examinations and other findings.

Increased in

  1. Infections
  2. IGA Myeloma
  3. Autoimmune diseases

Decreased in

  1. Non-IgA Myeloma
  2. Protein-losing enteropathies
  3. Immunodeficiency diseases

Conversion

Use our conversion tool to quickly convert between conventional units and SI units

mg/dL
µmol/L

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