Glucose challenge test for detecting gestational diabetes mellitus: a systematic review

Authors


Dr M van Leeuwen, Department of Obstetrics and Gynaecology, Academic Medical Centre, Meibergdreef 9, 1105 AZ, the Netherlands. Email marsha.vanleeuwen@amc.uva.nl

Abstract

Please cite this paper as: van Leeuwen M, Louwerse M, Opmeer B, Limpens J, Serlie M, Reitsma J, Mol B. Glucose challenge test for detecting gestational diabetes mellitus: a systematic review. BJOG 2012;119:393–401.

Background  The best strategy to identify women with gestational diabetes mellitus (GDM) is unclear.

Objectives  To perform a systematic review to calculate summary estimates of the sensitivity and specificity of the 50-g glucose challenge test for GDM.

Search strategy  Systematic search of MEDLINE, EMBASE and Web of Science.

Selection criteria  Articles that compared the 50-g glucose challenge test with the oral glucose tolerance test (OGTT, with a 75- or 100-g reference standard) before 32 weeks of gestation.

Data collection and analysis  Summary estimates of sensitivity and specificity, with 95% confidence intervals and summary receiver operating characteristic curves, were calculated using bivariate random-effects models. Two reviewers independently selected articles that compared the 50 g glucose challenge test to the oral glucose tolerance test (OGTT, 75 or 100 gram, reference standard) before 32 weeks of gestation.

Main results  Twenty-six studies were included (13 564 women). Studies that included women with risk factors showed a pooled sensitivity of the 50-g glucose challenge test of 0.74 (95% CI 0.62–0.87), a pooled specificity of 0.77 (95% CI 0.66–0.89) (threshold value of 7.8 mmol/l), a derived positive likelihood ratio (LR) of 3.2 (95% CI 2.0–5.2) and a negative LR of 0.34 (95% CI 0.22–0.53). In studies with consecutive recruitment, the pooled sensitivity was 0.74 (95% CI 0.62–0.87) for a specificity of 0.85 (95% CI 0.80–0.91), with a derived positive LR of 4.9 (95% CI 3.5–7.0) and negative LR of 0.31 (95% CI 0.20–0.47). Increasing the threshold for disease (OGTT result) increased the sensitivity of the challenge test, and decreased the specificity.

Author’s conclusions  The 50-g glucose challenge test is acceptable to screen for GDM, but cannot replace the OGTT. Further possibilities of combining the 50-g glucose challenge test with other screening strategies should be explored.

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