A normal blood sugar range for an adult is less than 100 milligrams per deciliter when fasting for a minimum of 8 hours, or 140 mg/dL after eating, according to WebMD. Sugar levels are usually their lowest right before mealtime when nondiabetics' sugar levels are generally around 70 to 80 mg/dL.
Placenta previa is a condition in which your placenta grows near or over your cervix (opening of your uterus). The placenta forms during pregnancy and provides oxygen and nutrition to your unborn baby. The placenta also removes waste products from the fetus.
Tests for bleeding problems during later pregnancy. Both placenta previa and placental abruption can cause heavy bleeding of bright red blood from the vagina. A vaginal examination is often used to help diagnose placental abruption, but could trigger heavier bleeding in the case of placenta previa.