The screening steps for gestational diabetes involve, for most women, the recommendation to undergo a 75-gram glucose tolerance test at the hospital between 24 to 28 weeks of pregnancy. The method includes fasting blood draw, consuming 75 grams of glucose, and monitoring blood sugar levels one hour and two hours after glucose intake, to determine the presence of gestational diabetes. However, for pregnant women at high risk for diabetes, it is recommended to complete the 75-gram glucose tolerance test early in pregnancy to detect gestational diabetes early and initiate treatment promptly to reduce the risks to both the fetus and the mother.