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Related Experiment Videos

IgG, IgA and IgM concentration in human sera from different age groups: statistical evaluation.

L Quintiliani, F Taggi, E Giuliani

    Bollettino Dell'Istituto Sieroterapico Milanese
    |July 31, 1976
    PubMed
    Summary

    This study established new normal serum immunoglobulin (IgG, IgA, IgM) ranges for 773 blood donors. Age and sex-specific intervals were determined for accurate clinical interpretation.

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    Area of Science:

    • Immunology
    • Biochemistry
    • Statistics

    Background:

    • Serum immunoglobulin levels (IgG, IgA, IgM) are crucial biomarkers.
    • Establishing accurate reference ranges is essential for diagnosing immunodeficiencies and other conditions.
    • Previous reference ranges may not fully account for demographic variations.

    Purpose of the Study:

    • To statistically analyze serum IgG, IgA, and IgM concentrations in a large cohort of blood donors.
    • To establish age- and sex-specific fiducial intervals for normal immunoglobulin values.
    • To propose updated reference ranges for improved clinical utility.

    Main Methods:

    • Serum samples from 773 blood donors were analyzed for IgG, IgA, and IgM concentrations.
    • Donors were stratified by sex and age into 10-year intervals (20-59 years).

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  • Normal values were calculated using mean +/- 2 standard deviations to define fiducial intervals.

    • Main Results:

    • A single reference interval for IgG (87-234 U.I.) was proposed.
    • Two distinct intervals for IgA were determined based on age (<40 years: 54-236 U.I.; >40 years: 64-270 U.I.).
    • Four age- and sex-specific intervals for IgM were established, with variations noted for males (<40: 65-364 U.I.; >40: 57-314 U.I.) and females (<50: 47-363 U.I.; >50: 53-434 U.I.).

    Conclusions:

    • The study successfully defined new, specific fiducial intervals for serum IgG, IgA, and IgM.
    • These proposed intervals account for variations in age and sex.
    • The findings provide a more precise basis for interpreting immunoglobulin levels in clinical practice.