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Journal of Clinical Microbiology, August 2005, p. 3769-3771, Vol. 43, No. 8
0095-1137/05/$08.00+0     doi:10.1128/JCM.43.8.3769-3771.2005
Copyright © 2005, American Society for Microbiology. All Rights Reserved.

Evaluation of the VACUTAINER PPT Plasma Preparation Tube for Use with the Bayer VERSANT Assay for Quantification of Human Immunodeficiency Virus Type 1 RNA

Tarek Elbeik,1* Patricia Nassos,1 Patricia Kipnis,2 Barbara Haller,1 and Valerie L. Ng1

Clinical Laboratories at San Francisco General Hospital and Department of Laboratory Medicine, University of California, San Francisco, California,1 Diagnostic Division, Bayer HealthCare LLC, Berkeley, California2

Received 18 October 2004/ Accepted 22 April 2005

Separation and storage of plasma within 2 h of phlebotomy is required for the VACUTAINER PPT Plasma Preparation Tube (PPT) versus 4 h for the predecessor VACUTAINER EDTA tube for human immunodeficiency virus type 1 (HIV-1) viral load (HIVL) testing by the VERSANT HIV-1 RNA 3.0 assay (branched DNA). The 2-h limit for PPT imposes time constraints for handling and transporting to the testing laboratory. This study compares HIVL reproducibility from matched blood in EDTA tubes and PPTs and between PPT pairs following processing within 4 h of phlebotomy, stability of plasma HIV-1 RNA at 24- and 72-h room temperature storage in the tube, and comparative labor and supply requirements. Blood from 159 patients was collected in paired tubes (EDTA/PPT or PPT/PPT): 86 paired EDTA tubes and PPTs were processed 4 h following phlebotomy and their HIVLs were compared, 42 paired PPT/PPT pairs were analyzed for intertube HIVL reproducibility, and 31 PPT/PPT pairs were analyzed for HIV-1 RNA stability by HIVL. Labor and supply requirements were compared between PPT and EDTA tubes. PPTs produce results equivalent to standard EDTA tube results when processed 4 h after phlebotomy. PPT intertube analyte results are reproducible. An average decrease of 13% and 37% in HIVL was observed in PPT plasma after 24 and 72 h of room temperature storage, respectively; thus, plasma can be stored at room temperature up to 24 h in the original tube. PPTs offer labor and supply savings over EDTA tubes.

* Corresponding author. Mailing address: San Francisco General Hospital, Department of Laboratory Medicine, Building NH, Room 2M35, 1001 Potrero Ave., San Francisco, CA 94110. Phone: (415) 476-4604. Fax: (415) 206-3045. E-mail: elbeik{at}itsa.ucsf.edu.

Journal of Clinical Microbiology, August 2005, p. 3769-3771, Vol. 43, No. 8
0095-1137/05/$08.00+0     doi:10.1128/JCM.43.8.3769-3771.2005
Copyright © 2005, American Society for Microbiology. All Rights Reserved.





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