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Human T-lymphotropic virus type I/II serology (qualitative, plasma)

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

This test checks for antibodies to Human T-lymphotropic virus (HTLV), a virus that can cause serious health conditions like a rare blood disease (HTLV-associated myelopathy) or certain cancers.

Quick summary

["This screening helps detect if you’ve been exposed to HTLV, which can affect your immune system over time."]

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

Key facts at a glance

LOINC
61112-9
Short code
HTLV SerPl
Synonyms
HTLV SerPl
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

What Does This Test Measure?

The test looks for antibodies in your plasma that your immune system produces in response to HTLV. If present, these antibodies indicate past or possible current infection. The method used is an immunoassay, which detects these antibodies through a chemical reaction.

Why Might You Need This Test?

This test is not for diagnosing active infections immediately but helps identify exposure. If positive, further testing may be needed to assess risk and symptoms.

What to Expect Before the Test

The blood sample is sent to a lab where it is tested for HTLV antibodies. Results are typically available within a few days to a week, depending on your healthcare provider’s lab.

What the Results Mean

A positive result does not always mean you have active disease. It may mean you were exposed to the virus at some point. Your doctor will discuss next steps, which may include additional tests or monitoring.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Clinical Significance

Short name

HTLV Serology (Screen/Confirm)

Frequently asked questions

How long does it take to get my HTLV serology results?
Results are usually available within 5 to 7 business days, but this can vary by lab. Your healthcare provider will contact you once they have the results.
Can I have this test if I’m pregnant?
Yes, this test can be performed during pregnancy. However, it’s important to discuss the potential implications of HTLV infection with your healthcare provider, as it may affect prenatal care or delivery plans.
Is there anything I should avoid before this test?
No special preparations are needed. Avoiding alcohol or certain medications before the test isn’t typically required unless instructed by your doctor. Always follow your healthcare provider’s guidance.
  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