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HIV-2 Subtype Detection by Nucleic Acid Amplification Probe

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

This test checks for specific genetic variations (subtypes) of HIV-2, a virus that can cause HIV infection. It uses a molecular method to detect these subtypes in your blood.

Quick summary

["This test helps determine which subtype of HIV-2 you may have, which can inform treatment decisions."]

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

Key facts at a glance

LOINC
73659-5
Short code
HIV 2 subtype Spec NAA+probe
Synonyms
HIV 2 subtype Spec 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
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 HIV-2 infection and want to know which subtype you have. Knowing your subtype can help guide treatment choices, such as selecting medications that are most effective against your specific virus strain.

What to Expect Before the Test

No special preparation is needed. A blood sample will be taken from a vein, usually in your arm. You may feel a slight pinch, but it typically doesn’t cause significant discomfort.

How the Test Works

The test uses a molecular technique called nucleic acid amplification probe (NAAT) to detect specific genetic sequences of HIV-2 subtypes. This helps identify which subtype of the virus is present in your blood.

What the Results Mean

If the test detects HIV-2 subtypes, it confirms the presence of the virus and identifies which subtype you have. Results will be reported as either positive (subtype detected) or negative (no subtype detected).

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Knowing your HIV-2 subtype can help your healthcare provider tailor your treatment plan. Some antiretroviral medications are more effective against certain subtypes, which may improve your treatment response and reduce viral load more effectively.

Short name

HIV-2 Subtype Test

Frequently asked questions

What does a positive result mean?
A positive result means your healthcare provider has detected specific genetic variations (subtypes) of HIV-2 in your blood. This helps them determine the most appropriate treatment options for you.
How long does it take to get the results?
Results are typically available within a few days to a week, depending on the laboratory’s processing time. Your healthcare provider will contact you once the results are ready.
Can this test be used to diagnose HIV-2 infection?
This test specifically detects HIV-2 subtypes and is not used as a standalone diagnostic test for HIV-2 infection. It is usually performed after an initial HIV-2 diagnosis to determine subtype.
  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