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v2.1.4829.produseast1

Journal Article > Research

Field suitability and diagnostic accuracy of the Biocentric open real-time PCR platform for dried blood spot-based HIV viral load quantification in Eswatini

Kerschberger B, Ntshalintshali N, Mpala Q, Diaz Uribe PA, Maphalala G, Kalombola S, Telila AB, Chawinga T, Maphalala M, Jani A, Phugwayo N, de la Tour R, Nyoni N, Goiri J, Dlamini SV, Ciglenecki I, Fajardo E
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Abstract
BACKGROUND
To assess the performance and suitability of dried blood spot (DBS) sampling using filter paper to collect blood for viral load (VL) quantification under routine conditions.

METHODS
We compared performance of DBS VL quantification using the Biocentric method with plasma VL quantification using Roche and Biocentric as reference methods. Adults (≥18 years) were enrolled at 2 health facilities in Eswatini from October 12, 2016 to March 1, 2017. DBS samples were prepared through finger-prick by a phlebotomist (DBS-1), and through the pipetting of whole venous blood by a phlebotomist (DBS-2) and by a laboratory technologist (DBS-3). We calculated the VL-testing completion rate, correlation, and agreement, as well as diagnostic accuracy estimates at the clinical threshold of 1000 copies/mL.

RESULTS
Of 362 patients enrolled, 1066 DBS cards (DBS-1: 347; DBS-2: 359; DBS-3: 360) were tested. Overall, test characteristics were comparable between DBS-sampling methods, irrespective of the reference method. The Pearson correlation coefficients ranged from 0.67 to 0.82 (P < 0.001) for different types of DBS sampling using both reference methods, and the Bland-Altman difference ranged from 0.15 to 0.30 log10 copies/mL. Sensitivity estimates were from 85.3% to 89.2% and specificity estimates were from 94.5% to 98.6%. The positive predictive values were between 87.0% and 96.5% at a prevalence of 30% VL elevations, and negative predictive values were between 93.7% and 95.4%.

CONCLUSIONS
DBS VL quantification using the newly configured Biocentric method can be part of contextualized VL-testing strategies, particularly for remote settings and populations with higher viral failure rates.
Countries
Eswatini
Subject Area
diagnosticsHIV/AIDS
DOI
10.1097/QAI.0000000000002101
Published Date
01-Sep-2019
PubMed ID
31408452
Languages
English
Journal
Journal of Acquired Immune Deficiency Syndromes (1999)
Volume / Issue / Pages
Volume 82, Issue 1, Pages 96-104
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