Yildirim, MelahatKosus, AydinKosus, NerminHizli, DenizAkcal, BanuKosger, Hatice2025-10-242025-10-2420170973-39301998-3832https://doi.org/10.1007/s13410-015-0386-0https://hdl.handle.net/20.500.12899/3358This study aims to evaluate the relationship between the glucose challenge test (GCT) levels and any of the oral glucose tolerance test (OGTT) parameters (fasting plasma glucose (FPG), 1-, 2-, or 3-h plasma glucose levels) and their effect on predicting gestational diabetes mellitus (GDM). This analysis was carried out as a retrospective study at Obstetrics and Gynecology Clinic of Turgut A-zal University Hospital. Oral GCT were conducted on patients who are at 24-29 weeks' gestation. The study participants with positive GCT results underwent a 3-h, 100-g OGTT, and the resulting values were evaluated using Carpenter and Coustan diagnostic criteria to determine the gestational glucose tolerance status of patients. The data obtained from both tests (GCT, FPG, 1-, 2-, 3-h OGTT values) were analyzed to observe the effect of each group on predicting GDM. Although all of the GCT and OGTT values were found to be statistically significant (p < 0.001) in determining GDM, the 2-h values of OGTT detected almost all GDM cases with a very high sensitivity level (94.5 %). The 1-h values on the other hand identified 87.6 % of GDM (p < 0.001). The GCT value with the highest sensitivity and specificity for predicting GDM was calculated as 154.50 mg/dl (sensitivity and specificity rates were 79.2 and 72.8 %, respectively). A 2-h OGTT glucose level can detect GDM with 94.5 % sensitivity. This result can guide clinicians to evaluate the patients with GDM.eninfo:eu-repo/semantics/closedAccessGestational diabetes mellitus; Oral glucose challenge test; Oral glucose tolerance test; PredictionArticle10.1007/s13410-015-0386-03721121152-s2.0-85020401614Q3WOS:000402992200005Q4