Which analysis of maternal serum may predict chromosomal abnormalities in the fetus?
Biophysical profile
Lecithin/sphingomyelin [L/S] ratio
Type and crossmatch of maternal and fetal serum
Multiple-marker screening
The Correct Answer is D
Choice A reason: Biophysical profile is a test that assesses the fetal well-being by measuring five parameters: fetal breathing movements, fetal movements, fetal tone, amniotic fluid volume, and fetal heart rate. It does not predict chromosomal abnormalities in the fetus.
Choice B reason: Lecithin/sphingomyelin [L/S] ratio is a test that measures the amount of two phospholipids in the amniotic fluid. It is used to evaluate the fetal lung maturity and the risk of respiratory distress syndrome. It does not predict chromosomal abnormalities in the fetus.
Choice C reason: Type and crossmatch of maternal and fetal serum is a test that determines the blood type and Rh factor of the mother and the fetus. It is used to identify the risk of hemolytic disease of the newborn due to Rh incompatibility. It does not predict chromosomal abnormalities in the fetus.
Choice D reason: Multiple-marker screening is a test that measures the levels of four substances in the maternal serum: alpha-fetoprotein, human chorionic gonadotropin, unconjugated estriol, and inhibin A. It is used to estimate the risk of Down syndrome, trisomy 18, and neural tube defects in the fetus.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is D
Explanation
Choice A reason: Magnesium sulfate does not improve patellar reflexes and increase respiratory efficiency. In fact, it may cause hyporeflexia and respiratory depression as adverse effects. These are signs of magnesium toxicity and require immediate intervention.
Choice B reason: Magnesium sulfate does not prevent a boggy uterus and lessen lochial flow. A boggy uterus is a sign of uterine atony, which can lead to postpartum hemorrhage. Lochia is the normal vaginal discharge after childbirth. Magnesium sulfate has no effect on these conditions.
Choice C reason: Magnesium sulfate does not shorten the duration of labor. It may actually prolong labor by relaxing the uterine muscles and inhibiting contractions. Magnesium sulfate is not used to induce or augment labor.
Choice D reason: Magnesium sulfate is used to prevent and treat convulsions in women with preeclampsia and eclampsia. Convulsions are a life-threatening complication of severe hypertension during pregnancy. Magnesium sulfate acts as a central nervous system depressant and anticonvulsant. It reduces the risk of seizures and lowers blood pressure.
Correct Answer is A
Explanation
Choice A reason:
Nagele's rule for calculating the estimated date of confinement (EDC) involves subtracting 3 months from the first day of the last menstrual period and adding 7 days. For February 13th, subtracting 3 months gives us November 13th, and adding 7 days gives us November 20th. This is the most accurate calculation for the estimated date of confinement.
Choice B reason:
This choice is not accurate according to Nagele's rule. Adding 7 days to November 13th would give November 20th, not November 27th.
Choice reason:
This choice is not accurate according to Nagele's rule. Adding 7 days to November 13th would give November 20th, not November 21st.
Choice D reason:
This choice is not accurate according to Nagele's rule. Subtracting 3 months from February 13th would give November 13th, not November 14th.
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