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This study assesses the association between the number of abnormal glucose values in the OGTT in the first pregnancy and GDM recurrence in a subsequent pregnancy in a Nordic cohort.<\/jats:p><\/jats:sec><jats:sec><jats:title>Material and Methods<\/jats:title><jats:p>This register\u2010based cohort study included 1677 women who had their first singleton delivery in 2009, underwent a 75\u2009g 2\u2010h OGTT during the pregnancy, and gave birth at least once more within 10\u2009years according to the Finnish Medical Birth Register. The cut\u2010off values were as follows: \u22655.3\u2009mmol\/L at fasting, \u226510.0\u2009mmol\/L at 1\u2009h, and \u22658.6\u2009mmol\/L at 2\u2009h. The odds ratio (OR) for GDM recurrence in the second pregnancy was analyzed via multivariable logistic regression adjusted for other potential factors associated with recurrence risk.<\/jats:p><\/jats:sec><jats:sec><jats:title>Results<\/jats:title><jats:p>During the first pregnancy, GDM was diagnosed in 331 (24.5%) women based on one (<jats:italic>n<\/jats:italic>\u2009=\u2009250) or two or three (<jats:italic>n<\/jats:italic>\u2009=\u200981) abnormal glucose values in the OGTT. The total recurrence rate for GDM in the subsequent pregnancy was 56.2%. The rate differed significantly between women with one (51.6%) and women with two or three (70.4%) abnormal values in first\u2010pregnancy OGTT. Compared with those with normal OGTT results, the adjusted OR (aOR) for GDM in the subsequent pregnancy in women with one abnormal glucose value was 6.00 (95% CI, 4.34\u20138.30), while it was 13.37 (7.52\u201323.76) in women with two or three abnormal values. The odds for GDM recurrence among those with two or three abnormal glucose values was double compared to those with only one abnormal value (aOR 2.03, 1.12\u20133.68).<\/jats:p><\/jats:sec><jats:sec><jats:title>Conclusions<\/jats:title><jats:p>Primiparous women with one abnormal glucose value in the first OGTT have remarkable odds of GDM recurrence, with the odds doubling when there are two or three abnormal values during the first pregnancy. These findings can be used when planning effective counseling, prevention, and screening strategies for GDM in the subsequent pregnancy.<\/jats:p><\/jats:sec>","DOI":"10.1111\/aogs.15148","type":"journal-article","created":{"date-parts":[[2025,5,2]],"date-time":"2025-05-02T09:09:48Z","timestamp":1746176988000},"page":"1452-1462","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":1,"title":["The recurrence risk of gestational diabetes according to the number of abnormal values in the oral glucose tolerance test"],"prefix":"10.1111","volume":"104","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-1761-7050","authenticated-orcid":false,"given":"Jenni","family":"Pukkila","sequence":"first","affiliation":[{"name":"Research Unit of Clinical Medicine, Department of Obstetrics and Gynecology, Medical Research Center, Oulu University Hospital University of Oulu  Oulu Finland"},{"name":"Welfare Epidemiology and Monitoring Unit, Department 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