Early versus 6–12 week postpartum glucose tolerance testing for women with gestational diabetes

Abstract

Objective:

The objective of this study is to estimate the accuracy of early oral glucose tolerance testing (GTT), to predict impaired glucose tolerance.

Study Design:

This was a prospective cohort study. Women received an early 75 g 2 h GTT between postpartum days 2–4 and again 6–12 weeks postpartum. The ability of the early GTT to accurately detect impaired glucose tolerance and diabetes was assessed by calculating sensitivity, specificity, positive predictive value (PPV) and negative predictive values (NPVs). The routine 6–12-week postpartum GTT was considered the gold standard.

Results:

The early GTT was completed by 100% of subjects, whereas only 31 of 58 (53%) women returned to complete the 6–12-week postpartum GTT. The early GTT had modest sensitivity for impaired glucose tolerance (62.5%) and overt diabetes (50%). However, it had excellent specificity (100%), PPV (100%) and NPV (96.7%) for diabetes. The NPV for impaired glucose tolerance with the early GTT was 80%.

Conclusion:

Rates of 6–12 week postpartum GTT completion among patients with gestational diabetes is poor. Appropriate postpartum management may improve by using the early GTT as a screening test.

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Acknowledgements

EBC was supported by a NIH T32 training grant (5T32HD055172-05). Support for this research was provided in part by the Robert Wood Johnson Foundation. The views expressed here do not necessarily reflect the views of the Foundation.

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Correspondence to E B Carter.

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Carter, E., Martin, S., Temming, L. et al. Early versus 6–12 week postpartum glucose tolerance testing for women with gestational diabetes. J Perinatol 38, 118–121 (2018). https://doi.org/10.1038/jp.2017.159

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