The effectiveness of selected temporary testing protocols for gestational diabetes during the COVID-19 pandemic

Objective During the COVID-19 pandemic, the screening approach to the diagnosis of gestational diabetes mellitus (GDM) was subject to emergency simplifications. We aimed at assessing the effectiveness of two of these temporary pandemic protocols—namely the Australian and UK, and to examine the insights they gave into the effectiveness of the more standard WHO-outlined GDM diagnosis protocol. Methods We performed a retrospective analysis of 432 GDM patients attending the outpatient clinic at the University Hospital of Cracow, Poland throughout 2020. Results When applying the UK criteria, 272 (63.0%) of 432 GDM cases would be missed. Women with missed-GDM by UK criteria were slightly older, had lower BMI, and had lower use of insulin. The frequency of child perinatal complications was lower in the missed GDM group (7.6% vs. 18.9%, p = 0.042) when compared to the non-missed cases group. When applying the Australian criteria, 86 of 432 (19.9%) GDM cases would be missed. Women with missed-GDM by the Australian criteria had lower BMI and less commonly used insulin than the women not missed. There were no differences in the frequency of child and maternal complications. Conclusions Modifications proposed from the UK and Australia resulted in varying decreases and delays in GDM diagnoses, but with no apparent harm to mothers and offspring. More studies are required to investigate the impact of the simplification of GDM diagnosis on pregnancy outcomes.