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Lab test

Donor HTLV-I/II Antibody Screen Test

This test screens a blood sample for antibodies to HTLV-I and HTLV-II. Quest lists it for the screening of donors of human cells, tissues, and cellular or tissue-based products for infectious disease markers.

Quest patient service center

About this test

The test measures antibodies to HTLV-I and HTLV-II using an immunoassay method, from a serum or plasma sample collected in an EDTA (lavender-top) tube. It is part of screening for infectious disease markers in donors of human cells and tissues, which is the specific use Quest lists for this product.

Quest lists this product under several names, including Donor, HTL-V/II Antibody and Donor Testing Only, all referring to the same donor-screening antibody panel. Because the test is scoped to donor screening, it is used for the screening of donors of human cells, tissues, and cellular and tissue-based products for infectious diseases, rather than for evaluating a person's own symptoms.

Test details

CollectionQuest patient service center

Quest resources

Additional details

What this test looks at

The test reports whether HTLV-I and HTLV-II antibodies are present in a serum or plasma sample, using immunoassay methodology. Quest's listing frames the test around donor screening for human cells, tissues, and cellular or tissue-based products.

This test isn't part of the Celio Health store at the moment, so it can't be ordered or requested here. The test menu lists everything that can.

Laboratory results should always be interpreted by a licensed clinician who knows your health history. This page is information about a test, not medical advice.

Frequently asked questions

What does this test measure?

It measures antibodies to HTLV-I and HTLV-II in a blood sample, using an immunoassay method.

How is the sample collected?

The test uses a serum or plasma sample collected in an EDTA (lavender-top) tube.

Do I need to prepare for this test?

No preparation instructions are listed for this test, though people follow any instructions their ordering clinician provides.

What is this test used for?

Quest lists it for the screening of donors of human cells, tissues, and cellular and tissue-based products for infectious diseases.

Last updated 2026-09-18 · How we write about lab testing

Educational content

This page is for general educational purposes only. It is not medical advice, and it is not a substitute for consultation with a qualified healthcare professional. Laboratory results should always be interpreted by a licensed clinician who knows your health history. If you have questions about your health or your results, talk with your doctor. If you think you may be experiencing a medical emergency, call 911.