Test library
HTLV Antibody Blood Test
The HTLV Type 1 and 2 Antibody Test detects antibodies to the human T-cell lymphotropic virus in a blood sample. It is used to screen for HTLV infection and to distinguish between type I and type II when a screen is reactive.
Order HTLV Type 1&2 Antibody Test: Human T-Cell Lymphotropic Virus
Order online and visit a local collection site, or choose an at-home kit where available. No referral and no insurance required.
Order HTLV Type 1&2 Antibody Test: Human T-Cell Lymphotropic Virus- Typical turnaround
- 1-3 business days
- Starting price
- From $240
- Results
- Confidential, online
Quick answer
The HTLV Type 1 and 2 Antibody Test is a blood test that looks for antibodies against the human T-cell lymphotropic virus, a retrovirus with two main types. HTLV can be transmitted through sexual contact, blood exposure, and from a mother to a child, and most people who carry it have no symptoms. The test is used for screening and, when needed, for confirmatory testing that separates type I from type II.
What this test measures
HTLV stands for human T-cell lymphotropic virus, a retrovirus that infects a type of white blood cell. Type I and type II are closely related but distinct, and they have different patterns of occurrence around the world. Many carriers remain healthy throughout life, while a small proportion develop conditions involving the nervous system, blood, or immune system.
Screening is usually performed with an immunoassay that detects antibodies to both types together. Because screening tests can produce reactive results that do not hold up on further review, a reactive sample is normally confirmed with a more specific method such as a line immunoassay or Western blot that includes type-specific proteins. The result can then be reported as HTLV-I, HTLV-II, or negative.
People may order this test after possible exposure, as part of blood or tissue donation screening, when a partner is known to carry the virus, or during an evaluation that raises concern for HTLV-related disease. Testing is also used in some occupational and public health settings. A qualified healthcare provider should explain what a result means and discuss any follow-up.
- HTLV-I and HTLV-II total antibodies by screening immunoassay
- HTLV-I type-specific antibody markers
- HTLV-II type-specific antibody markers
- Recombinant envelope protein antibody bands such as GD21 and rgp46
- Core protein antibody bands such as p19 and p24
- Confirmatory line immunoassay or Western blot when a screen is reactive
Why people order this test
- Screen for HTLV infection after a possible exposure
- Confirm a reactive HTLV screening result with a more specific method
- Distinguish HTLV type I from type II for clinical clarity
- Test a partner when one person is known to carry the virus
- Support blood, organ, or tissue donation screening requirements
- Evaluate selected neurologic or blood-related symptoms with a clinician
How to prepare
No fasting is required for this blood test. Follow the collection instructions provided by the laboratory, and let the testing provider know about possible exposure, prior results, or relevant medical history.
Understanding your results
Results are usually available within one to three business days. A reactive screening test must be confirmed with a type-specific method before it is considered positive. A confirmed result indicates infection with HTLV, but most carriers remain without symptoms, and a qualified healthcare provider can explain what monitoring or follow-up may be appropriate.
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Frequently Asked Questions
What is HTLV?
HTLV is a retrovirus that infects white blood cells. Types I and II are the main types tested, and many carriers never develop symptoms.
How is HTLV transmitted?
HTLV can be transmitted through sexual contact, exposure to infected blood, and from mother to child, including through breastfeeding. It is not spread by casual contact.
What does a reactive screening result mean?
A reactive screen means the first test found antibodies that need confirmation. Additional testing is required to determine whether the result is truly positive and which type is present.
What is the difference between HTLV type I and type II?
The two types are related viruses with different geographic patterns and slightly different health associations. Identifying the type helps with counseling and follow-up.
Is there a vaccine for HTLV?
No vaccine is available. A qualified healthcare provider can discuss what a diagnosis means for the person and their close contacts.
Ready to get tested?
Order online and visit a collection site near you, or choose a mail-in kit. No referral and no insurance required.
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Every page on this site is reviewed for clarity, sourcing, and accuracy. We update our library as testing options, collection networks, and accreditation standards change.