A nurse is reviewing the contraindications for a Contraction Stress Test (CST) with a pregnant client.

Which condition would be a contraindication for the test?

Gestational diabetes.

Mild preeclampsia.

Preterm labor.

Ruptured membranes.

Answer and Explanation

The Correct Answer is D

This is a contraindication for the Contraction Stress Test (CST) because it increases the risk of infection and umbilical cord prolapse.

A CST is a test that measures the baby’s heart rate during uterine contractions induced by oxytocin or nipple stimulation.

Choice A is wrong because gestational diabetes is not a contraindication for the CST.

It is a condition that affects how the body processes glucose during pregnancy and may cause complications such as macrosomia (large baby), hypoglycemia (low blood sugar) or preeclampsia (high blood pressure and protein in urine).

Choice B is wrong because mild preeclampsia is not a contraindication for the CST.

It is a condition that causes high blood pressure and protein in urine after 20 weeks of pregnancy and may affect the placenta, kidneys, liver or brain.

Choice C is wrong because preterm labor is a relative contraindication for the CST, not an absolute one.

It means that the test may be performed if the benefits outweigh the risks, but it should be avoided if possible because it may trigger early labor or delivery.

Preterm labor is defined as regular uterine contractions with cervical changes before 37 weeks of pregnancy.

Normal ranges for blood pressure are below 120/80 mmHg, for glucose are 70-100 mg/dL (fasting) or below 140 mg/dL (2 hours after eating), and for protein in urine are less than 300 mg/24 hours.

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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.

A. An ultrasound and a nonstress test. B. An ultrasound and a contraction stress test. C. A Doppler ultrasound and a nonstress test. D. A Doppler ultrasound and a contraction stress test.

Correct Answer is A

Explanation

The test involves an ultrasound and a nonstress test.

A biophysical profile (BPP) is a way to check on the overall fetal health by observing the fetus’s heart rate, breathing, movement, muscle tone, and the amount of amniotic fluid surrounding the fetus in the uterus.

It is typically performed after 28 weeks of pregnancy, especially for high-risk pregnancies or if there is a chance of complications.

Choice B is wrong because a contraction stress test is not part of a BPP.

A contraction stress test measures how the fetus’s heart rate changes during contractions induced by oxytocin or nipple stimulation.

It is a different test from a nonstress test, which measures the fetus’s heart rate while moving and at rest without any stimulation.

Choice C is wrong because a Doppler ultrasound is not part of a BPP.

A Doppler ultrasound uses sound waves to measure the blood flow in the umbilical cord and other blood vessels.

It is a different type of ultrasound from the one used in a BPP, which uses sound waves to create images of the fetus and the amniotic fluid.

Choice D is wrong because it combines two incorrect components from choices B and C. A BPP does not involve a Doppler ultrasound or a contraction stress test.

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A nurse is reviewing the contraindications for a Contraction Stress Test (CST) with a pregnant client. Which condition would be a contraindication for the test?

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Naxlex Comprehensive Predictor Exams

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Explanation

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Correct Answer is A

Explanation

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A nurse is reviewing the contraindications for a Contraction Stress Test (CST) with a pregnant client.

Which condition would be a contraindication for the test?