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.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is A
Explanation
“The patient should have a full bladder for a transabdominal US and an empty bladder for a transvaginal US.”1 This is because a full bladder helps to lift the uterus and improve the visibility of the pelvic organs in a transabdominal US, while an empty bladder prevents distortion of the image in a transvaginal US.
Choice B is wrong because tight-fitting clothing is not necessary and lying prone on an examination table is uncomfortable and may interfere with the insertion of the vaginal probe.
Choice C is wrong because loose-fitting clothing is not necessary and lying supine on an examination table may cause supine hypotension syndrome in pregnant women.
Choice D is wrong because loose-fitting clothing is not necessary and lying prone on an examination table is uncomfortable and may interfere with the insertion of the vaginal probe.
Correct Answer is B
Explanation
Choice A is wrong because it describes a transabdominal CVS procedure, which involves a needle instead of a catheter.
Choice C is wrong because it describes a procedure that is not used for CVS.A needle inserted through the cervix could damage the fetal membranes or cause bleeding.
Choice D is wrong because it describes a procedure that is not possible.A catheter cannot be inserted through the abdomen and uterus into the placenta.
Normal ranges for CVS are not applicable as it is a diagnostic test, not a screening test.
It provides a definitive result of whether the fetus has a chromosomal abnormality or a genetic disorder.CVS is usually done between 10 and 13+6 weeks of pregnancy.
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