A nurse is reinforcing teaching with a client about how to reduce the risk of giving birth to a newborn who has a neural tube defect. Which of the following instructions should the nurse include in the teaching?

Choice A rationale:
Uterine enlargement greater than expected for gestational age is not a typical finding in a possible ectopic pregnancy. An ectopic pregnancy occurs when the fertilized egg implants outside the uterus, usually in the fallopian tube, and the uterus does not enlarge normally.
Choice B rationale:
Copious vaginal bleeding is not a typical finding in a possible ectopic pregnancy. Vaginal bleeding can occur, but it is not usually copious.
Choice C rationale:
Severe nausea and vomiting are not typically associated with a possible ectopic pregnancy. Nausea and vomiting are common symptoms in early pregnancy, but they are not specific to an ectopic pregnancy.
Choice D rationale:
Pelvic pain is a common finding in a possible ectopic pregnancy. The pain is often sharp, and unilateral, and may be located on one side of the lower abdomen or pelvis.

Choice A rationale: Kernicterus is a severe form of jaundice that can result from untreated hyperbilirubinemia in a newborn. The indirect Coombs test does not assess the risk of kernicterus specifically.
Choice B rationale: The indirect Coombs test detects Rh-negative antibodies in the mother's blood, not Rh-positive antibodies.
Choice C rationale: The indirect Coombs test, also known as the indirect antiglobulin test (IAT), is performed on a pregnant woman to detect the presence of Rh-negative antibodies in her blood. If the mother is Rh-negative and has been sensitized to Rh-positive blood, these antibodies can cross the placenta and attack the red blood cells of an Rh-positive fetus, potentially causing hemolytic disease of the newborn (HDN) or erythroblastosis fetalis.
Choice D rationale: The direct Coombs test (direct antiglobulin test) is used to detect the presence of maternal antibodies that have already been attached to the newborn's red blood cells. The indirect Coombs test is used to identify the presence of these antibodies in the mother's blood before they have attached to the newborn's red blood cells.