Human T-lymphotropic virus type I/II antibody screening (serum/plasma)
This test checks for antibodies to the Human T-lymphotropic virus (HTLV), which can cause serious health conditions like HTLV-associated myelopathy (HAM) or tropical spastic paraparesis (TSP). It helps determine if you’ve been exposed to the virus.
["This screening helps identify possible exposure to HTLV, which may require further evaluation."]
Key facts at a glance
- LOINC
- 14221-6
- Short code
- HTLV I p32 Ab Ser Ql
- Synonyms
- HTLV I p32 Ab Ser Ql
- Category
- chemistry
- Sample
- serum
- Container
- Red-top tube (SST)
- Units
- N/A
- Fasting
- false
- Population
- adult
- Sex
- all
- Age range
- 18–65 years
- 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 Matters
HTLV is a rare but serious virus that primarily affects the immune system. While most people infected with HTLV don’t develop symptoms, some may experience nerve damage, chronic fatigue, or other health issues over time. This test is not used to diagnose active infection but to screen for past exposure, which may warrant additional testing.
What the Test Involves
A blood sample is taken from your arm and sent to a lab. The test detects antibodies (proteins produced by your immune system in response to HTLV). The method used is an immunoassay, which measures these antibodies in your serum or plasma.
What to Expect Before the Test
There are no special preparations needed for this test. You can eat, drink, or take medications as usual. If you’re pregnant, have a history of bleeding disorders, or are on blood thinners, let your healthcare provider know before the test.
What to Expect After the Test
After the blood draw, you may feel slight discomfort or bruising at the site. Apply pressure to stop any bleeding. You can return to your normal activities immediately. If you experience excessive bleeding or signs of infection (like redness, swelling, or fever), contact your healthcare provider.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
A positive screening result means your body has detected antibodies to HTLV, suggesting past exposure. This does not confirm an active infection but may prompt further testing (such as confirmation assays) to assess risk. If negative, you have not been exposed to HTLV antibodies in this sample. Early detection can help monitor for potential complications and guide preventive care.
Short name
HTLV-1/2 Antibody Screen
Frequently asked questions
What Does a Positive or Negative Result Mean?
How Often Should I Get This Test?
Can This Test Be Done at Home?
Sources
- 1
- 2Lab Tests OnlineSource
- 3
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.
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