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Immunoglobulin A (IgA)

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Immunoglobulin A (IgA)

IgA stands for immunoglobulin A, an antibody involved in immune protection. A quantitative blood test measures its amount; IgA is often assessed alongside IgG and IgM.

COMMON RANGE

61 – 356

mg/dL

0

451

M

Mayo Clinic Laboratories

Adult

See all sources ↓

CONVERT & COMPARE

mg/dL

=

2.09

g/L

Reference ranges by source

Published adult intervals: 6, from 5 named sources, shown in mg/dL.

SOURCE

SEX

AGE

RANGE

VISUAL

CITE

A

ARUP Laboratories

All

≥18y

68 – 408 mg/dL

M

Mayo Clinic Laboratories

All

≥18y

61 – 356 mg/dL

L

Labcorp

Male

≥18y

90 – 386 mg/dL

L

Labcorp

Female

≥18y

87 – 352 mg/dL

Q

Quest Diagnostics

All

≥18y

47 – 320 mg/dL

J

JSCC / JAMT Japan

All

≥18y

100 – 410 mg/dL

A

ARUP Laboratories

All · ≥18y

68 – 408 mg/dL

M

Mayo Clinic Laboratories

All · ≥18y

61 – 356 mg/dL

L

Labcorp

Male · ≥18y

90 – 386 mg/dL

L

Labcorp

Female · ≥18y

87 – 352 mg/dL

Q

Quest Diagnostics

All · ≥18y

47 – 320 mg/dL

J

JSCC / JAMT Japan

All · ≥18y

100 – 410 mg/dL

Ages 0–17 (CALIPER)

5 age- and sex-stratified entries from the Canadian Laboratory Initiative on Pediatric Reference Intervals.

SOURCE

SEX

AGE

RANGE

VISUAL

CITE

C

CALIPER: Canadian Pediatric Reference Intervals

All

0–1y

1 – 29 mg/dL

C

CALIPER: Canadian Pediatric Reference Intervals

All

1y–3y

4 – 90 mg/dL

C

CALIPER: Canadian Pediatric Reference Intervals

All

3y–6y

26 – 147 mg/dL

C

CALIPER: Canadian Pediatric Reference Intervals

All

6y–14y

47 – 221 mg/dL

C

CALIPER: Canadian Pediatric Reference Intervals

All

14y–19y

53 – 287 mg/dL

C

CALIPER: Canadian Pediatric Reference Intervals

All · 0–1y

1 – 29 mg/dL

C

CALIPER: Canadian Pediatric Reference Intervals

All · 1y–3y

4 – 90 mg/dL

C

CALIPER: Canadian Pediatric Reference Intervals

All · 3y–6y

26 – 147 mg/dL

C

CALIPER: Canadian Pediatric Reference Intervals

All · 6y–14y

47 – 221 mg/dL

C

CALIPER: Canadian Pediatric Reference Intervals

All · 14y–19y

53 – 287 mg/dL

Which IgA reference range applies?

Read the test name, unit and age band before comparing numbers. Adult and pediatric intervals are listed separately below. Use the interval on the original laboratory report for that person’s age, rather than applying the highlighted adult example to a child.

High or low IgA does not diagnose a condition by itself. Your provider considers other immunoglobulins, symptoms, medicines and medical history; additional tests may be needed.

When keeping a history, retain the original unit and laboratory interval with each date. Changing a display unit does not make results from different laboratories clinically interchangeable.

Explanation prepared by Joelis labs, UAB · Sources checked 2026-09-22

MedlinePlus: immunoglobulins blood test ↗

MedlinePlus: understanding lab results ↗

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Related biomarkers

More tests in the other category.

Prostate Specific Antigen (PSA)

Sources

ARUP Laboratories

Mayo Clinic Laboratories

Quest Diagnostics

J

JSCC / JAMT Japan

CALIPER: Canadian Pediatric Reference Intervals

Last updated 2026-05-02

This page presents source-specific reference data and sourced explanations. For general wellness information only. This is not medical advice. For diagnosis or treatment of any condition, talk to a qualified clinician.

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