Introduction: Risk-based screening has been replaced by universal screening as the recommended course of care for gestational diabetes mellitus (GDM). As of 2016, no state in Nigeria had implemented a policy of universal screening for GDM. This research aimed to assess findings from a universal screening programme and its implication for scaling up universal and early screening for GDM. Methods: This was a descriptive cross-sectional study conducted in Rivers State Nigeria between February 2017 and January 2020. Multistage sampling was used to recruit 9314 pregnant women from 30 primary, secondary, and tertiary health facilities in the state. An interviewer-administered structured questionnaire was used by trained healthcare workers to collect socio-demographic, obstetric and medical information. All study participants had a plasma glucose test on their first hospital visit and a diagnosis made using the World Health Organization (WHO) criteria. Data obtained was analysed using the IBM Statistical Package for Social Sciences (SPSS) version 23. Results: Most women [5683 (61.0%)] were aged 25-34 (mean 29.60 ± 5.64) years. The preva-

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