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SARS-CoV-2 ORF1ab Antibody (Qualitative) by Nucleic Acid Amplification Probe

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

This test detects antibodies to a specific protein (ORF1ab) from the SARS-CoV-2 virus, which causes COVID-19. It helps determine if your immune system has recognized and responded to the virus, even if you no longer have active infection symptoms.

Quick summary

["This test checks for past infection by measuring antibodies to a key viral protein, not current infection status."]

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

Key facts at a glance

LOINC
95824-9
Short code
SARS-CoV-2 ORF1ab Sal Ql NAA+probe
Synonyms
SARS-CoV-2 ORF1ab Sal Ql NAA+probe
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
probe-amp-tar
CPT
86430
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

Why This Test Is Done

Your healthcare provider may order this test to confirm a previous SARS-CoV-2 infection if you’ve had symptoms or exposure to COVID-19. It can also be used in research studies or for monitoring immunity in certain populations. Unlike PCR tests that detect active virus, this test looks for evidence of your immune system’s response to the virus.

What to Expect Before the Test

No special preparation is needed. You may collect a blood sample from a vein in your arm, similar to other blood tests. If you’re concerned about needles, let your healthcare provider know so they can discuss alternatives.

What the Test Results Mean

Positive results indicate your immune system has produced antibodies against the SARS-CoV-2 ORF1ab protein, suggesting you’ve likely been exposed to the virus. Negative results mean no detectable antibodies were found, which could mean you were never infected or the test was taken too early after exposure.

Limitations and Considerations

This test is qualitative and does not measure antibody levels. It may not detect early infections or those with very low antibody responses. False negatives can occur if tested too soon after exposure or if the immune response hasn’t fully developed.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Clinical Significance

Short name

SARS-CoV-2 ORF1ab Antibody Test (Qualitative)

Frequently asked questions

What does a positive result mean for my health?
A positive result suggests your body has mounted an immune response to SARS-CoV-2, which may indicate past infection. However, it does not confirm current infection or immunity. This test is often used alongside other tests (like PCR) to help determine past exposure, especially in research or surveillance settings.
Can this test be used to confirm if I’m immune to COVID-19?
No, this test alone cannot confirm immunity. Antibody tests are not a substitute for vaccination or a negative PCR test. Immunity depends on multiple factors, including vaccination status, prior infection, and antibody levels, which are not measured by this test.
How soon after infection can I expect a positive result?
Antibody levels typically develop within 2–3 weeks after infection, but some people may take longer. This test may not detect antibodies early in the infection or if the immune response is weak, so it’s not reliable for diagnosing active COVID-19.
  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