Figure 3.

Testing procedure used to classify viral load undetectable clients as true positive (HIV positive) and false positive (HIV negative).

Clients were classified as currently on ART or pre-ART at the time of their blood redraws. All clients with stored frozen samples prior to ART initiation were assayed using national testing algorithm. Clients who were determined to be HIV negative and/or indeterminate were requested for an additional blood draw to confirm their HIV status and the national testing algorithm was repeated on the blood redraws. If the client was on ART at the time of blood draw, the samples were further tested in parallel on Architect HIV Ag/Ab and Genscreen Ultra HIV Ag/Ab.