[Weeks 24-27] Gestational diabetes test is an essential prenatal test!
Gestational diabetes (GDM) is associated with pregnancy and delivery complications such as gestational hypertension and difficult delivery. It can also increase the baby’s risk of macrosomia (being larger than expected) and neonatal hypoglycemia (low blood sugar after birth). Women who have had gestational diabetes also have a higher long-term risk of developing type 2 diabetes, and their children may have an increased risk of obesity and diabetes later in life. For this reason, managing blood glucose during pregnancy is important, and continued screening and healthy lifestyle habits are recommended after delivery as well. Screening for gestational diabetes is generally performed between 24 and 28 weeks of pregnancy. A commonly used screening test is the 50-g glucose challenge test (GCT). You drink a solution containing 50 g of glucose, and your blood glucose is measured 1 hour later. Fasting is generally not required for this screening test. Because the drink contains a high concentration of glucose, however, some women may experience nausea or dizziness. The cutoff varies by healthcare provider, but if the 1-hour blood glucose level reaches or exceeds a certain threshold—commonly 130–140 mg/dL—this does not mean you have been diagnosed with gestational diabetes. Instead, you will usually be offered a diagnostic glucose tolerance test. One diagnostic method is the 100-g oral glucose tolerance test (100-g OGTT). This test is performed after fasting. Blood glucose is measured while fasting and again 1, 2, and 3 hours after drinking the glucose solution. Follow your healthcare provider’s instructions regarding fasting and test preparation. When the 100-g OGTT is used, specific glucose thresholds are applied at each time point. In commonly used diagnostic criteria, gestational diabetes is diagnosed when two or more of the four values meet or exceed the specified thresholds. A normal screening result does not mean that healthy eating and physical activity are no longer important. Regardless of your screening result, maintaining a balanced diet and appropriate physical activity during pregnancy is important, with additional guidance based on your individual risk factors and test results.