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Landy et al (1995), in an effort to avoid the two-step testing, suggested that increasing the diagnostic threshold of blood glucose level during the GCT from > 140 mg/dl to ³ 186 mg/dl, could serve as an alternative for the OGTT. Using the OGTT as the gold standard, they showed that the Positive Predictive Value (PPV) of test was 78.6 %, meaning that almost 79% of women with the proposed blood glucose levels during a GCT, were correctly classified as diabetic without the need for further testing. The prevalence of GDM among the population studied by Landy and collaborators was 39.2%.