Loss to follow-up occurs at all stages in the diagnostic and follow-up period among HIV-infected patients in Guinea-Bissau: a 7-year retrospective cohort study.

Objectives To describe loss to follow-up (LTFU) at all stages of the HIV programme. Design A retrospective cohort study. Setting The HIV clinic at Hospital National SimAo Mendes in Bissau, Guinea-Bissau. Participants A total of 4080 HIV-infected patients. Outcome measures Baseline characteristics, percentages and incidence rates of LTFU as well as LTFU risk factors at four different stages: immediately after HIV diagnosis (stage 1), after the first CD4 cell count and before a follow-up consultation (stage 2), after a follow-up consultation for patients not eligible for antiretroviral treatment (ART; stage 3) and LTFU among patients on ART (stage 4). Results Almost one-third of the patients were lost to the programme before the first consultation where ART initiation is decided; during the 7-year observation period, more than half of the patients had been lost to follow-up (overall incidence rate=51.1 patients lost per 100 person-years). Age below 30years at inclusion was a risk factor for LTFU at all stages of the HIV programme. The biggest risk factors were body mass index <18.5kg/m(2) (stage 1), male gender (stage 2), HIV-2 infection (stage 3) and CD4 cell count <200 cells/L (stage 4). Conclusions In this study, LTFU constituted a major problem, and this may apply to other similar ART facilities. More than half of the patients were lost to follow-up shortly after enrolment, possibly implying a high mortality. Thus, retention should be given a high priority.