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Line Blot Immunoassay for Human Immunodeficiency Virus (HIV) Antibodies

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

This test detects antibodies to HIV, the virus that causes AIDS, using a line blot assay to confirm infection after initial screening.

Quick summary

["This test helps confirm if you have HIV antibodies, which may indicate past or current infection."]

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

Key facts at a glance

LOINC
93742-5
Short code
HTLV I+II Ab Patrn CSF Line blot-Imp
Synonyms
HTLV I+II Ab Patrn CSF Line blot-Imp
Category
chemistry
Sample
csf
Container
Sterile tube
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
line-blot
Specimen volume
1-2 mL
Stability
Immediate analysis required, Refrigerated: 1h
Hemolysis max
200
TAT
4–24 hours
Order
routine

How the Test Works

Your blood sample is tested using a line blot immunoassay. This method detects specific antibodies against HIV proteins. If antibodies are present, they bind to targets on the test strip, creating visible lines that confirm infection status.

What to Expect Before the Test

No special preparation is needed. You may have a blood draw at a clinic or lab, similar to other blood tests. Wear comfortable clothing and bring your insurance card if required.

What the Results Mean

A positive result means antibodies to HIV are detected, suggesting you may have been infected. A negative result means no detectable antibodies were found in this test. Follow-up testing may be recommended for confirmation.

Common Causes of Positive Results

A positive result can occur if you have HIV, or if you have been exposed recently and your immune system is still producing antibodies. It may also be falsely positive due to cross-reactivity with other infections or rare conditions.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

This test is critical for diagnosing HIV infection. Early detection allows for timely medical intervention, treatment, and management to improve health outcomes. It helps monitor disease progression and assess treatment effectiveness over time.

Short name

HIV Antibody Line Blot Test

Frequently asked questions

Why was I asked to take this test?
You may have been asked to take this test if you had symptoms suggestive of HIV, such as fever, fatigue, or weight loss; if you were exposed to HIV; or as part of routine screening in certain settings (e.g., healthcare visits, blood donations).
What does a positive result mean for my health?
A positive result means you may have HIV. Your healthcare provider will guide you on next steps, which may include additional testing, starting antiretroviral therapy (ART), and connecting you with support services.
Can I still have sex if my test is positive?
Yes, but it’s important to use protection (like condoms) and discuss your results with your partner(s) to prevent transmission. Your doctor can provide guidance tailored to your situation.
  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