Ordering Recommendation

Confirm antibody test results for a positive screening test (HTLV types I and II).

New York DOH Approval Status

This test is New York state approved.

Specimen Required

Patient Preparation

Serum separator tube. Also acceptable: lavender (K2 EDTA), lavender (K3 EDTA), green (sodium heparin), green (lithium heparin), or light blue (sodium citrate).

Specimen Preparation

Separate serum from cells ASAP or within 2 hours of collection. Transfer 1 mL serum to an ARUP Standard Transport Tube. (Min: 0.5 mL).

Storage/Transport Temperature


Unacceptable Conditions

Specimens containing particulate material.


After separation from cells: Ambient: Unacceptable; Refrigerated: 1 week; Frozen: Indefinitely (avoid repeated freeze/thaw cycles)


Qualitative Western Blot




1-8 days

Reference Interval


Interpretive Data

This assay should not be used for blood donor screening, associated re-entry protocols, or for screening Human Cell, Tissues and Cellular and Tissue-Based Products (HCT/P).

This test was developed and its performance characteristics determined by ARUP Laboratories. It has not been cleared or approved by the US Food and Drug Administration. This test was performed in a CLIA certified laboratory and is intended for clinical purposes.

Compliance Category

Laboratory Developed Test (LDT)


Order this assay only when a specimen is repeatedly reactive for HTLV I or HTLV I/II antibodies.

Hotline History


CPT Codes



Component Test Code* Component Chart Name LOINC
0020642 HTLV I/II Antibodies, Western Blot 16982-1
* Component test codes cannot be used to order tests. The information provided here is not sufficient for interface builds; for a complete test mix, please click the sidebar link to access the Interface Map.


  • HTLV 1, 2 western blot confirmation
  • HTLV 1/2
  • HTLV I/II Antibodies Western Blot
  • HTLV Types 1 & 2 Abs western blot
  • HTLV Types 1 & 2 confirmation
  • HTLV western blot
Human T-Lymphotropic Virus Types I/II Antibodies, Western Blot