A woman diagnosed with marginal placenta previa gave birth vaginally 15 minutes ago. At the present time she is at the greatest risk for:

Choice A reason: Amniocentesis for fetal lung maturity is not an expected diagnostic procedure for a pregnant woman with bright red, painless vaginal bleeding. It is a procedure that involves inserting a needle into the amniotic sac to obtain a sample of amniotic fluid, which can be used to assess the fetal lung development. It is usually done in late pregnancy or preterm labor, not in the second trimester.

Choice B reason: Contraction stress test (CST) is not an expected diagnostic procedure for a pregnant woman with bright red, painless vaginal bleeding. It is a test that involves stimulating uterine contractions, either by nipple stimulation or oxytocin infusion, to evaluate the fetal heart rate response. It is used to assess fetal well-being and placental function, not to diagnose the cause of bleeding.

Choice C reason: Internal fetal monitoring is not an expected diagnostic procedure for a pregnant woman with bright red, painless vaginal bleeding. It is a method of measuring the fetal heart rate and uterine contractions using electrodes or catheters that are inserted through the cervix and attached to the fetal scalp or the amniotic sac. It is usually done during labor, not in the second trimester.

Choice D reason: Ultrasound for placental location is an expected diagnostic procedure for a pregnant woman with bright red, painless vaginal bleeding. It is a test that uses sound waves to create an image of the uterus, the placenta, and the fetus. It can help to determine the position and attachment of the placenta, which can be the cause of bleeding if it is low-lying or covering the cervix (placenta previa).

Choice E reason: None of the above is not a correct answer. There is one expected diagnostic procedure for a pregnant woman with bright red, painless vaginal bleeding, which is ultrasound for placental location.

Choice A reason: Cheese is a good source of calcium, protein, and vitamin B12, but not folates. Folate is a water-soluble vitamin that is essential for the synthesis of DNA and the prevention of neural tube defects in the fetus.

Choice B reason: Potatoes are a good source of carbohydrates, potassium, and vitamin C, but not folates. Folate is found mainly in plant-based foods, especially dark green vegetables.

Choice C reason: Chicken is a good source of protein, iron, and zinc, but not folates. Folate is more abundant in legumes, nuts, and seeds than in animal products.

Choice D reason: Green leafy vegetables are a good source of folates, as well as vitamin A, vitamin K, and fiber. Folate is also known as folic acid when it is added to fortified foods or supplements. Pregnant women need at least 600 micrograms of folate per day.