What are the normal serum immunoglobulin levels (IgG, IgA, IgM)?

Serum levels of IgM, IgG and IgA vary with age, gender and race.

The IgG and IgA concentrations in children show a gradual rise with increasing age. The IgA level is generally about the same in both sexes. Girls typically have higher IgM and IgG levels than boys.

The confidence interval bounded by two standard deviations about the mean excludes 5% of apparently healthy controls.

Elevated IgM, low IgA, low IgG, low IgM, and elevated IgA are the commonest changes observed in apparently healthy humans.

Humoral immunodeficiency is commonly defined as IgG, IgM or IgA level that is two standard deviations (2 SD) below the mean level for IgG, IgM or IgA, respectively, for the particular age group and gender.

Serum levels of IgM, IgG and IgA. Source: Pediatrics, 1966 and Immunologic disorders in infants and children, by E. Richard Stiehm, Hans D. Ochs, Jerry A. Winkelstein.

Typical pattern of immunoglobulin levels (IgG, IgA, IgM) in humoral immunodeficiency. Click here to enlarge the table.


Serum immunoglobulin levels in healthy children and adults. J. W. Stoop, B. J. M. Zegers, P. C. Sander, and R. E. Ballieux. Clin Exp Immunol. 1969 January; 4(1): 101–112.

The relationship of race, sex, and age to concentrations of serum immunoglobulins expressed in international units in healthy adults in the USA. S. E. Maddison, C. C. Stewart, C. E. Farshy, and C. B. Reimer. Bull World Health Organ. 1975; 52(2): 179–185.

Serum immunoglobulin concentrations in preschool children measured by laser nephelometry: reference ranges for IgG, IgA, IgM. D Isaacs, D G Altman, C E Tidmarsh, H B Valman, and A D Webster. J Clin Pathol. 1983 October; 36(10): 1193–1196.

Serum Immunoglobulin Levels Throughout the Life-Span of Healthy Man. Ann of Int Med, November 1, 1971, Vol. 75 no. 5 673-682.


  1. Anonymous1/25/2012

    I need to know what caused this to happen to me???? What have I done to make my immune level fall so low.... iga is 5, igg is 303 and igm level is 1. is there any way with diet????
    or anything else that I can do to improve these levels????

  2. Anonymous1/25/2012

    It's unlikely that diet will improve your Ig levels. The best approach is to see a board-certified allergist/immunologist at an academic center:


  3. Anonymous3/28/2014

    I don't understand this, I am 33 yrs old and IGG is 1140.0, IGais170.0 and IGM is 36. Is this normal?

  4. Anonymous5/20/2015

    I am 54 and had a test done and my IgG is 1824 do I need to see a doctor about this?

  5. Anonymous5/20/2015

    IgG of 1800 is too high. See your doctor for recommendations....

    1. Anonymous11/15/2015

      See a hematologist to be evaluated for MGUS

  6. Anonymous2/13/2016

    My son was diagnosed with a laundry list of illnesses, one being IgA deficiency a year ago. No one ever followed up on that or re-tested his levels. Should I have him re-checked now that he is 3?

  7. Anonymous12/30/2016

    Be aware that these levels are from a study in 1966. Research updated ranges.

  8. Hello, there. I am 25 and my Immunoglobulin A is 397 it is too high and dangerous?