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HIV-1 Antibody Screening and Confirmation (gp41/gp43)

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

This test detects antibodies to the HIV-1 virus, which your immune system produces in response to infection. It helps screen for HIV and confirm a positive result.

Quick summary

["Early detection of HIV infection is crucial for managing your health."]

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

Key facts at a glance

LOINC
19110-6
Short code
HIV1 gp41+gp43 Ab Ser Ql IB
Synonyms
HIV1 gp41+gp43 Ab Ser Ql IB
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
ib
CPT
86701
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 if you have symptoms of HIV (such as fever, fatigue, or swollen lymph nodes), have risk factors for HIV (like unprotected sex or sharing needles), or are part of a group at higher risk for infection. It may also be used as part of routine screening in certain settings.

How the Test Works

The test uses a blood sample to identify antibodies against specific proteins (gp41 and gp43) of the HIV-1 virus. If antibodies are found, it suggests past or current infection. The test is first screened (scr) and then confirmed (cnf) for accuracy.

What to Expect Before the Test

No special preparation is needed. You may have a small needle inserted into your arm to draw blood. If you’re nervous, let your healthcare provider know so they can help make you more comfortable.

What to Expect After the Test

After the blood is drawn, you may feel slight bruising or soreness at the site. Apply pressure to stop any bleeding, and avoid rubbing the area. Most people return to their normal activities immediately.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Positive results indicate the presence of HIV antibodies, meaning you may have been infected. This does not mean you have AIDS (Acquired Immunodeficiency Syndrome), but it is an important step toward diagnosis and treatment. Follow-up testing and medical evaluation are needed to confirm diagnosis and guide care. Negative results mean no detectable antibodies at this time, but HIV can still be present if you were infected recently.

Short name

HIV Antibody Test

Frequently asked questions

What Does a Positive Test Mean?
A positive test result means your blood contains antibodies to HIV-1. This suggests you may have been infected, but further testing is needed to confirm. Your healthcare provider will discuss next steps, such as additional tests or treatment options.
How Soon Can I Get Results?
Results are typically available within 1–3 business days. If you have a high-risk exposure, your provider may schedule results sooner. Ask your healthcare provider for an estimated timeline.
Can I Have HIV Without Antibodies?
Yes, if you were infected recently (within the first few months), your body may not have had enough time to produce detectable antibodies. Some people may also have a temporary false-negative result. Follow-up testing is often done to check for HIV RNA (viral load) if initial antibody tests are unclear.
  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