A nurse is teaching about fetal development to a group of clients in the antenatal clinic.
Which of the following statements should the nurse include in the teaching?
“The baby’s heart beat is audible by a Doppler stethoscope at 12 weeks of pregnancy.”
“The baby’s sex can be determined by ultrasound at 8 weeks of pregnancy.”
“The baby’s lungs are fully mature by 24 weeks of pregnancy.”
“The baby’s eyes open and close by 16 weeks of pregnancy.”
The Correct Answer is A
The baby’s heart beat is audible by a Doppler stethoscope at 12 weeks of pregnancy.
This is a device that uses sound waves to create an image of the baby’s heart and measure its rate and rhythm.
Some possible explanations for the other choices are:
Choice B is wrong because the baby’s sex can not be determined by ultrasound at 8 weeks of pregnancy.
The external genitalia are not fully developed until around 14 to 16 weeks of pregnancy.
Even then, the accuracy of ultrasound depends on factors such as the position of the baby, the quality of the equipment, and the skill of the sonographer.
Choice C is wrong because the baby’s lungs are not fully mature by 24 weeks of pregnancy.
The lungs are one of the last organs to develop in the fetus and they continue to grow and mature until near term.
The production of surfactant, a substance that helps the lungs expand and prevent collapse, begins around 24 weeks but is not sufficient until around 34 to 36 weeks.
Choice D is wrong because the baby’s eyes do not open and close by 16 weeks of pregnancy.
The eyelids are fused together until around 26 to 28 weeks of pregnancy, when they start to open and close periodically.
The baby can also respond to light and dark stimuli around this time.
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Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is B
Explanation
The correct answer is choice B. The nurse should inform her that results are typically available within 7 days.
This is known as the rapid CVS result.
A more detailed set of CVS results will be available within 2 weeks.
Choice A is wrong because 24 hours is too short for the laboratory to test the sample of cells from the placenta.
Choice C is wrong because 10-14 days is the timeframe for the more detailed set of CVS results, not the rapid CVS result.
Choice D is wrong because 30 days is too long for the results to be available.
The woman would need to know the results sooner to make informed decisions about her pregnancy.
Correct Answer is D
Explanation
The correct answer is choice D. The client has a history of placenta previa.
Placenta previa is a condition where the placenta covers all or part of the cervix, blocking the baby’s exit from the uterus.
This can cause severe bleeding during pregnancy and delivery and increase the risk of complications for both the mother and the baby.
Therefore, the nurse should report this condition to the provider before performing an amniocentesis.
Choice A is wrong because having Rh-negative blood type is not a contraindication for amniocentesis.
However, the client may need an injection of Rh immunoglobulin after the procedure to prevent Rh sensitization.
Choice B is wrong because having a history of preterm labor is not a contraindication for amniocentesis.
However, the client may need to be monitored closely for signs of preterm labor after the procedure.
Choice C is wrong because having a history of gestational diabetes is not a contraindication for amniocentesis.
However, the client may need to have their blood glucose levels checked before and after the procedure.
Amniocentesis is a diagnostic procedure that involves removing and testing a small sample of amniotic fluid from the uterus for genetic or chromosomal conditions, such as Down syndrome, Edwards syndrome or Patau syndrome.
It can also be used to diagnose fetal infections, treat excess amniotic fluid, or test fetal lung maturity
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