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SARS-CoV-2 IgA Antibody (Serum/Plasma)

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

This test detects antibodies of the IgA type produced in response to exposure to the SARS-CoV-2 virus, which causes COVID-19. IgA antibodies are part of the immune system’s early response and can appear in serum or plasma.

Quick summary

["IgA antibodies may help identify past infection or ongoing immune response to COVID-19."]

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

Key facts at a glance

LOINC
94562-6
Short code
SARS-CoV-2 IgA SerPl Ql IA
Synonyms
SARS-CoV-2 IgA SerPl Ql IA
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
ia
CPT
82784
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 Does This Test Measure?

The test measures the presence of IgA antibodies specific to SARS-CoV-2 proteins. These antibodies are part of the body’s immune reaction to the virus, often appearing shortly after infection but can persist longer than other antibody types. This test is typically used to screen for past infection or assess immune response.

Why Might You Need This Test?

Healthcare providers may order this test if you have symptoms of COVID-19, have been exposed to the virus, or if you are recovering from an infection. It can also be used in research or monitoring immune responses in certain clinical settings.

How Is the Sample Collected?

A blood sample is drawn from a vein in your arm. The blood is then separated into serum or plasma for testing. This process is quick and usually causes only minor discomfort.

What Are the Possible Results?

Results may be positive (indicating the presence of IgA antibodies), negative (no detectable antibodies), or inconclusive (depending on the test sensitivity). Interpretation depends on clinical context, such as symptoms, vaccination status, or exposure history.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Clinical Significance: IgA Antibodies in COVID-19

Short name

IgA Antibody to SARS-CoV-2

Frequently asked questions

What does a positive IgA antibody result mean?
A positive IgA antibody result suggests that your immune system has recognized and responded to SARS-CoV-2 at some point, which could indicate past infection. However, IgA antibodies alone are not definitive proof of current infection and may not always correlate with immunity. They can also appear in people who have been vaccinated or exposed to the virus.
Can IgA antibodies help determine if I have active COVID-19?
IgA antibodies alone are not used to diagnose active COVID-19. They are typically measured alongside other antibody types (IgG, IgM) or viral tests (PCR) for a more comprehensive assessment. If you suspect active infection, consult your healthcare provider for appropriate testing.
Are IgA antibodies reliable for tracking immunity after COVID-19?
IgA antibodies can indicate an immune response but are not always a reliable marker for long-term immunity. Other factors, such as IgG levels, vaccination history, and clinical recovery, are often considered together to assess immunity and ongoing protection.
  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