1,3,5 If the results of this one-hour test are between 140 mg/dL and 190 mg/dL, then you will need to have a three-hour oral glucose tolerance test. How often should you check your blood sugar? Eat small, frequent, well-balanced meals to keep blood sugar levels steady. Exercise, unless your doctor has advised against it, but do not exceed your normal level. Some will say that if your one-hour blood sugar level is 140 milligrams of glucose per deciliter of blood plasma (mg/dL) or more, you need to have the glucose tolerance test. In the later parts of your pregnancy, you may become more insulin resistant, so blood sugar builds up to higher levels. Others put the cutoff at 130 mg/dL to catch more women who may have gestational diabetes, even though there are likely to be more false positives this way.

Blood sugar levels are important for all mothers to be with diabetes –as well controlled blood glucose levels can significantly increase the likelihood of having a healthy baby. The NHS advises the target HbA1c for mothers before and during pregnancy is 43 mmol/mol (or 6.1%). If the resulting blood sugar level is 190 milligrams per deciliter (mg/dL) or higher, then you have gestational diabetes.