Background: The prevalence of gestational diabetes depends on the method of diagnosis as well as ethnic background. Maternal age has also been identified as a factor, but has not been given much attention. The notion of gestational prediabetes has also speculated, but is equally yet to be a focus in discussion. Aim: This work aimed at evaluating the screening for gestational diabetes in Central Hospital, Warri; to determine prevalence of gestational diabetes in the general population and in stratified age groups. The other objective was to investigate the effectiveness and use of the methods of diagnosis. Materials and Methods: This was a retrospective review of laboratory data of de-identified antenatal patients. Hospital records of gestational diabetes from 2013 to 2015 were obtained from the Central Hospital, Warri. Data collected included age of the de-identified patients, blood glucose results and whether the test was fasting or random. Other information was the month/year of test. A total of 3 589 results were analyzed. Results: Averaged prevalence of 5.85% is identified. Fasting blood sugar (FBS) measurement was used more and it also identified more positives (9%) compared to random blood sugar (<2%). On a dichotomous age group, prevalence of gestational diabetes appeared low in women below 25 years compared to those ≥26 years old. In a more stratification of age groups, potential antepartum prediabetes in pregnancy was lower in women above 40 years old relative to the younger age subpopulations (p < 0.000001). No significant variation was observed in level of usage of either method between months/years. Conclusion:  There is an ongoing good practice of using affordable screening test, which is FBS. The significant finding was that there may be up to 9% prevalence of GDM and that this number may erroneously be lower if random blood glucose measurement is used. Another worthy observation was that the prevalence in stratified age groups was non-directional, especially as prediabetes appears higher in the younger age subpopulation.

Prediabetes is a state of hyperglycaemia that is above normal, but below blood glucose threshold for diabetes mellitus. As part of the theme for World Diabetes Day of 2017, it has been articulated by the International Diabetes Federation, that up to 16% of births may be affected by this condition and it is estimated that 50% of the affected antenatal patients are under 30 years old. The notion of gestational prediabetes, hyperglycaemia in pregnancy as a clinical condition is yet to be seriously discussed in regards to prediabetes in pregnancy. Instead, it seems to be subsumed in the discourse of gestational diabetes mellitus. This subsuming position is evident in the fact that even in discussion of management challenges of the ‘hyperglycaemia in pregnancy’ condition, blood glucose thresholds for gestational diabetes refers to higher versus lower cut-offs, but never refers to prediabetes.