Wade AN, Crowther NJ, Abrahams-Gessel S, et al. - Researchers conducted this cross-sectional study to examine concordance between haemoglobin A1c (HbA _1c)-defined diabetes and fasting plasma glucose (FPG)-defined diabetes in a black South African population with a high prevalence of obesity. Participants in the study were 765 black people aged 40 to 70 years and with no history of diabetes. Data reported that the prevalence of HbA _1c-defined diabetes was four times that of FPG-defined diabetes. Concordance between HbA _1c and FPG in diabetes diagnosis was poor in black South Africans, and participants with HbA _1c-only diabetes resembled normoglycemic participants phenotypically. More research is needed to determine which of these parameters best predicts diabetes-related morbidity in this population and whether a population-specific HbA _1c threshold is required.