Normal Blood Sugar Levels for Pregnant Women
May 23, 2025
Source: Cainiu Health
Dr. Liu Feng
Introduction
Between 24 and 28 weeks of pregnancy, an oral glucose tolerance test (OGTT) is usually performed. The fasting blood glucose level should be ≤5.1 mmol/L, blood glucose level 1 hour after glucose intake should be ≤10.0 mmol/L, and blood glucose level 2 hours after glucose intake should be ≤8.5 mmol/L. Gestational diabetes is diagnosed if any of these values is exceeded.
The normal blood glucose levels for pregnant women are determined according to different stages of pregnancy. Before 12 weeks of gestation, fasting blood glucose should be <5.1 mmol/L. Between 24 and 28 weeks of gestation, fasting blood glucose should be ≤5.1 mmol/L, 1-hour post-glucose load blood glucose should be ≤10.0 mmol/L, and 2-hour post-glucose load blood glucose should be ≤8.5 mmol/L.
Between 24 and 28 weeks of gestation, a glucose tolerance test (OGTT) is usually required. The fasting blood glucose should be ≤5.1 mmol/L, 1-hour post-glucose blood glucose should be ≤10.0 mmol/L, and 2-hour post-glucose blood glucose should be ≤8.5 mmol/L. If any of these values are exceeded, gestational diabetes is diagnosed. In early pregnancy, before 12 weeks of gestation, if fasting blood glucose is ≥5.1 mmol/L, it is necessary to be vigilant for pre-existing diabetes or early onset gestational diabetes.
Abnormal blood glucose levels during pregnancy may increase the risks of fetal macrosomia, preterm birth, and neonatal hypoglycemia, so standardized monitoring is important. Due to placental hormone secretion which counteracts insulin action, the standard for fasting blood glucose in pregnant women is stricter, needing to be controlled below 5.1 mmol/L. Women with gestational diabetes need to intensify monitoring under a physician's guidance and may require insulin therapy when necessary, to ensure maternal and fetal health.
Pregnant women should maintain a balanced and nutritious diet, avoid excessive intake of high-sugar and high-fat foods, increase consumption of whole grains, and choose low-GI foods such as oats and quinoa, which can help manage blood glucose levels.
