Introduction. The glucose intolerance later gestational diabetes is a very important indicator that helps establish the prognosis of diabetes in pregnant women who have had gestational diabetes (1). In this study we followed for one year to all gestational diabetes who were treated at the Hospital of Fuerteventura in endocrinology consultation,Canary Island, Spain. The aim was to study what factors might be related to glucose intolerance in the immediate postpartum. Material and methods. All pregnant women served with the diagnosis of gestational diabetes during April 2012 to May 2013, diagnosed according to the criteria of the ADA (2), were subjected to routine procedure of specialized gynecology and endocrinology unit, first: test loading test with 50 grams of glucose, and if blood glucose was greater whom 140 mg/dl, SOG was performed with 100 grams glucose three hours. All these patients were followed up with a minimum of a monthly review by both gynecology and endocrinology as was given a standard diet and as controls if necessary insulin treatment. In addition glycemia in the first quarter, glycated hemoglobin in the second and third quarter was measured, if there was family history of diabetes, as well as history of previous gestational diabetes, presence of other diseases, hypertension in pregnancy, if they had done treatment with diet or insulin. Finally, it determines if the birth was eutocic or dystocia. All the analyzes were performed in the Hospital Fuerteventura laboratory by standard autoanalyzer. SPSS v.24 program for frequency valuations and statistical analyzes. Was measured frequencies, all dependent and independent variables and logistic regression analysis, ANOVA and linear correlation with statistical significance of ≤0.05 was performed. Results. Of the 60 diabetic gestational included in the study, 49 completed the assessment of oral glucose tolerance test at 0 and 120 minutes, 81’7%, of these 57.1% were normal, 41.8% had glucose intolerance which were 26.5% impaired fasting glucose and 14’3 were intolerant, 2.5 were diabetic. In these patients: 57.6 percent had a normal vaginal delivery and 39.0% were dystocia. When we analyze all the variables according to the diagnosis of glucose intolerance, just correlated test 50 grams of glucose, ANOVA (p<0.033) with degrees of impaired glucose tolerance and there was a correlation positive linear between higher blood glucose value post 50 grams of glucose and glucose intolerance in the immediate postpartum. When we analyze dystocia, there was no correlation with any of the studied variables. Discussion. Interestingly in this study it is among correlation values loading test with 50g glucose and the presence of glucose intolerance and diabetes immediately after birth of gestational diabetes. It is known that after 50 grams of glucose greater than 200 glucose has an almost certain chance of having gestational diabetes (2) and according to some centers especially in the United States is not necessary to make a confirmatory SOG (2), however, their relationship to the immediate postpartum, it has not been seen in another study that we know until now and therefore part of their predictive value for gestational diabetes, could already give us an indication of glycemic alteration itself will happen in the immediate postpartum (3). Compared with other studies, the prevalence of glucose intolerance is similar to other high-risk populations, such as the Indian population (4), which gives the Canarian population at high risk of developing diabetes in the future. This study shows that the overload test with 50 grams of glucose is not only indicative of a very high suspicion of gestational diabetes, but can also help establish the prognosis of a future change in glucose metabolism in gestational diabetes.