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IgA Monomer, Serum/Plasma

Published: August 9, 2026Updated: August 16, 2026

Measures monomeric immunoglobulin A (IgA) in blood. It may help evaluate unusual IgA levels or suspected antibody-producing conditions.

Quick summary

["This blood test measures the individual, non-joined form of IgA found in the circulation."]

Medically reviewed by WellAlly Editorial TeamLast reviewed August 16, 2026Editorial policy

Key facts at a glance

LOINC
43208-8
Short code
ITA MoM SerPl
Synonyms
ITA MoM SerPl
Category
liver
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Specimen volume
5 mL
Stability
Room temperature: 4h, Refrigerated: 24h, Frozen: 7d
Hemolysis max
500
Lipemia max
1000
Icterus max
500
TAT
4–24 hours
Order
routine

What is this test?

This test measures monomeric immunoglobulin A (IgA) in serum or plasma. Monomeric IgA consists of individual antibody units circulating in the blood rather than being joined into larger structures.

Why might I need this test?

Your clinician may order this test to investigate an unusual IgA result, evaluate a suspected immune or antibody-producing condition, or help interpret other immunoglobulin findings. It is often considered alongside symptoms and the results of related blood tests.

How is the test performed?

A blood sample is collected, and the laboratory measures monomeric IgA using a validated laboratory method. The results are reported with a concentration or an amount in a specified blood volume.

How do I prepare for the test?

This test usually requires no special preparation or fasting. Follow any instructions provided by your clinician, particularly if other laboratory tests are being performed at the same time.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

Monomeric IgA

Frequently asked questions

What is monomeric IgA?
Monomeric IgA is immunoglobulin A made up of individual antibody units. In secretions, IgA can also form larger joined structures, which are different from the form measured by this blood test.
Does an abnormal result confirm a specific disease?
No. An abnormal monomeric IgA result is not diagnostic by itself and must be interpreted with other blood tests, symptoms, and your medical history.
Do I need to fast before this test?
Fasting is generally not required. Ask your clinician if you have received special preparation instructions for this or any other test being ordered.
  1. 1
    MedlinePlus — Laboratory TestsSource
  2. 2
    Lab Tests OnlineSource
  3. 3
    Mayo Clinic — Tests & ProceduresSource

Click any link to access the full source. PubMed Central (PMC) links provide free full-text access.

This information is for educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment.

Medical Disclaimer

This content is for general informational and educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the guidance of a qualified healthcare provider with any questions you have about a medical condition, and never disregard professional medical advice or delay seeking it because of something you read here.

If you think you may have a medical emergency, call your local emergency number or go to the nearest emergency department immediately.

Medically reviewed by WellAlly Editorial Team Last reviewed August 16, 2026. · Read our editorial policy