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Underestimation of risk for large babies in rural and remote Australia: Time to change plasma glucose collection protocols.


ABSTRACT:

Aims

Preanalytical glycolysis in oral glucose tolerance tests (OGTT) leads to substantial underestimation of gestational diabetes mellitus (GDM) and hence risk for large-for-gestational-age (LGA) babies. This paper quantified the impact of glycolysis on identification of LGA risk in a prospective rural and remote Australian cohort.

Methods

For 495 women, OGTT results from room temperature fluoride-oxalate (FLOX) tubes were algorithmically corrected for estimated glycolysis compared to 1) the Hyperglycaemia and Adverse Pregnancy Outcomes (HAPO) study protocol (FLOX tubes in ice-slurry); and 2) room temperature fluoride-citrate (FC) tubes. GDM was defined by International Association of the Diabetes and Pregnancy Study Groups (IADPSG) criteria. Unadjusted and corrected OGTT were related to LGA outcome.

Results

Correction for FC tubes increased GDM incidence from 9.7% to 44.6%. After correction for HAPO protocol, GDM incidence was 27.7% and prediction of LGA risk (RR 1.82, [1.11-2.99]) improved compared to unadjusted rates (RR 1.12, [0.51-2.47]). To provide similar results for FC tube correction (29.3% GDM; RR 1.81, [1.11-2.96]) required + 0.2 mmol/L adjustment of IADPSG criteria.

Conclusions

FC tubes present a practical alternative to the HAPO protocol in remote settings but give + 0.2 mmol/L higher glucose readings. Modification of IADPSG criteria would reduce perceived 'overdiagnosis' and improve LGA risk-assessment.

SUBMITTER: Jamieson EL 

PROVIDER: S-EPMC7820914 | biostudies-literature | 2021 Mar

REPOSITORIES: biostudies-literature

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Underestimation of risk for large babies in rural and remote Australia: Time to change plasma glucose collection protocols.

Jamieson Emma L EL   Spry Erica P EP   Kirke Andrew B AB   Roxburgh Carly C   Atkinson David N DN   Marley Julia V JV  

Journal of clinical & translational endocrinology 20210101


<h4>Aims</h4>Preanalytical glycolysis in oral glucose tolerance tests (OGTT) leads to substantial underestimation of gestational diabetes mellitus (GDM) and hence risk for large-for-gestational-age (LGA) babies. This paper quantified the impact of glycolysis on identification of LGA risk in a prospective rural and remote Australian cohort.<h4>Methods</h4>For 495 women, OGTT results from room temperature fluoride-oxalate (FLOX) tubes were algorithmically corrected for estimated glycolysis compare  ...[more]

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