A nurse is explaining the purpose of a Contraction Stress Test (CST) to a pregnant client.
What does the CST aim to assess?
Fetal well-being.
Maternal blood pressure.
Placental function.
Amniotic fluid volume.
The Correct Answer is A
A contraction stress test (CST) is performed near the end of pregnancy to determine how well the fetus will cope with the contractions of childbirth.
The aim is to induce contractions and monitor the fetus to check for heart rate abnormalities using a cardiotocograph.
A normal heartbeat is a good sign that the fetus will be healthy during labor.
Choice B is wrong because a CST does not measure maternal blood pressure.
Choice C is wrong because a CST does not assess placental function directly.
Choice D is wrong because a CST does not measure amniotic fluid volume.
Normal ranges for fetal heart rate are between 110 and 160 beats per minute.
Normal ranges for uterine contractions are between 2 and 5 contractions in 10 minutes, lasting less than 90 seconds each.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is A
Explanation
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.
Correct Answer is B
Explanation
The client should not eat a light meal before an abdominal ultrasound because it can interfere with the quality of the images.
The client should fast for 8 to 12 hours before the procedure.
Some additional information about the other choices are:
Choice A is correct.
The client should drink plenty of fluids before an appointment for an abdominal ultrasound because it helps to fill the bladder and push the uterus up for better visualization.
Choice C is correct.
The client should wear comfortable clothing that can be easily removed or lifted up to expose the abdomen.
Choice D is correct.
The client should arrive at the appointment with a full bladder because it acts as an acoustic window and improves the quality of the ultrasound images.
Normal ranges for fetal growth and development during pregnancy vary depending on the gestational age, but some general parameters are:
Fetal heart rate: 110 to 160 beats per minute
Biparietal diameter: 2.4 to 9.5 cm
Crown-rump length: 0.8 to 8.4 cm
Femur length: 1.0 to 7.8 cm
Abdominal circumference: 9.4 to 35.6 cm
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