Multi-centre field evaluation of the performance of the Trinity Biotech Uni-Gold HIV 1/2 rapid test as a first-line screening assay for gay and bisexual men compared with 4th generation laboratory immunoassays.
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.
['Keen|P|P|', 'Conway|D P|DP|', 'Cunningham|P|P|', 'McNulty|A|A|', 'Couldwell|D L|DL|', 'Davies|S C|SC|', 'Smith|D E|DE|', 'Gray|J|J|', 'Holt|M|M|', "O'Connor|C C|CC|", 'Read|P|P|', 'Callander|D|D|', 'Prestage|G|G|', 'Guy|R|R|']
D000293:Adolescent D000328:Adult D003951:Diagnostic Errors D005260:Female D015658:HIV Infections D006801:Humans D007118:Immunoassay D008297:Male D008403:Mass Screening D012680:Sensitivity and Specificity D000072339:Sexual and Gender Minorities D013997:Time Factors D055815:Young Adult
Performance p24 antigen 3rd generation immunoassay 4th generation immunoassay Acute HIV infection Rapid HIV test