Background The Trinity Biotech Uni-Gold HIV test (Uni-Gold) is often used as a supplementary rapid test in testing algorithms. Objective To evaluate the operational performance of the Uni-Gold as a first-line screening test among gay and bisexual men (GBM) in a setting where 4th generation HIV laboratory assays are routinely used. Study design We compared the performance of Uni-Gold with conventional HIV serology conducted in parallel among GBM attending 22 testing sites. Sensitivity was calculated separately for acute and established infection, defined using 4th generation screening Ag/Ab immunoassay (EIA) and Western blot results. Previous HIV testing history and results of supplementary 3rd generation HIV Ab EIA, and p24 antigen EIA were used to further characterise cases of acute infection. Results Of 10,793 specimens tested with Uni-Gold and conventional serology, 94 (0.90%, 95%CI:0.70–1.07) were confirmed as HIV-positive by conventional serology, and 37 (39.4%) were classified as acute infection. Uni-Gold sensitivity was 81.9% overall (77/94, 95%CI:72.6–89.1); 56.8% for acute infection (21/37, 95%CI:39.5–72.9) and 98.2% for established infection (56/57, 95%CI:90.6–100.0). Of 17 false non-reactive Uni-Gold results, 16 were acute infections, and of these seven were p24 antigen reactive but antibody negative. Uni-Gold specificity was 99.9% (10,692/10,699, 95%CI:99.9–100.0), PPV was 91.7% (95%CI:83.6–96.6) and NPV was 99.8% (95%CI:99.7–99.9), respectively. Conclusions In this population, Uni-Gold had good specificity and sensitivity was high for established infections when compared to 4th generation laboratory assays, however sensitivity was lower in acute infections. Where rapid tests are used in populations with a high proportion of acute infections, additional testing strategies are needed to detect acute infections.
Bibliographical noteFunding Information:
This work was supported by the NSW Ministry of Health and a National Health and Medical Research Council Program Grant (grant no. 568971 ). The Kirby Institute and the Centre for Social Research in Health (CSRH) receive funding from the Australian Government Department of Health . The Kirby Institute is affiliated with the Faculty of Medicine, UNSW Australia. CSRH is affiliated with the Faculty of Arts and Social Sciences, UNSW Australia. No pharmaceutical grants were received in the development of this study.
© 2016 Elsevier B.V.
- 3rd generation immunoassay
- 4th generation immunoassay
- Acute HIV infection
- Rapid HIV test
- p24 antigen