Objective: To evaluate the value of fasting plasma glucose (FPG) in screening a high-risk population for gestational diabetes mellitus (GDM). Study design: D uring an 8-month period, 1,685 pregnant women underwent the one-step 75 g ora l glucose tolerance test (OGTT) as a part of a universal screening program. The receiver operating characteristic (ROC) curve was used to analyze the performanc e of the FPG. Results: 333 (19.8%) women had GDM (WHO criteria). The area under the ROC curve of FPG to detect GDM was 0.639 (95%CI 0.603-0.674), which refle cted the degree of the FPG histogram overlap in women with and without GDM. A FP G threshold of 4.7 mmol/L reached the minimally acceptable sensitivity of 78.1% with a corresponding unacceptable specificity of 32.2%. 508 (31%) women were b elow this threshold, at a negative predictive value of 85.6%. The FPG at higher thresholds with acceptable specificity had poor sensitivity and positive predi ctive value to be useful. Conclusion: Though the high false positive rate at any FPG threshold with adequate sensitivity makes the FPG an inappropriate test for GDM screening, the FPG has the potential to avoid nearly one-third of the cumb ersome OGTTs at the expense of missing one-fifth of pregnant women with milder GDM.
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