Cystic fibrosis (CF) is suspected in a toddler. Which test is essential in establishing this diagnosis?
Bronchoscopy
Serum calcium
Urine creatinine
Sweat chloride test
The Correct Answer is D
This test measures the amount of chloride in the sweat, which is abnormally high in people with cystic fibrosis (CF). CF is an inherited disorder that affects the cells that produce mucus, sweat, and digestive juices.
Choice A is wrong because bronchoscopy is a procedure that allows the doctor to examine the airways and lungs, but it is not essential for diagnosing CF.
Choice B is wrong because serum calcium is a blood test that measures the level of calcium in the blood, which is not related to CF.
Choice C is wrong because urine creatinine is a test that measures the amount of creatinine in the urine, which reflects the kidney function, but it is not relevant to CF.
Normal ranges for sweat chloride test are:
- Less than 40 millimoles per liter (mmol/L) for children and adults
- Less than 30 mmol/L for infants younger than 6 months
A sweat chloride level of more than 60 mmol/L is considered positive for CF.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is D
Explanation
An Apgar score of 10 at 1 minute after birth indicates that the infant is having no difficulty adjusting to extrauterine life but who should be assessed again at 5 minutes after birth. The Apgar score is a scoring system that evaluates the health of newborns at 1 and 5 minutes after birth based on five criteria: appearance, pulse, grimace, activity, and respiration. Each criterion is scored from 0 to 2, and the total score ranges from 0 to 10. A score of 7 to 10 is considered reassuring, a score of 4 to 6 is moderately abnormal, and a score of 0 to 3 is concerning.
Choice A is wrong because an Apgar score of 10 at 1 minute does not mean that the infant needs no further testing. The infant should still be assessed again at 5 minutes and monitored for any signs of distress or complications.
Choice B is wrong because an Apgar score of 10 at 1 minute does not indicate an infant in severe distress who needs resuscitation. An Apgar score of 0 to 3 would indicate a concerning condition that may require immediate intervention.
Choice C is wrong because an Apgar score of 10 at 1 minute does not predict a future free of neurologic problems. The Apgar score alone cannot be considered as evidence of, or a consequence of, asphyxia or brain injury; it does not predict individual neonatal mortality or neurologic outcome; and it should not be used for that purpose.
Normal ranges for each criterion are as follows:
- Appearance (color): pink all over (2 points), body pink but extremities blue (1 point), blue, bluish-gray, or pale all over (0 points)
- Pulse (heart rate): greater than 100 beats per minute (2 points), less than 100 beats per minute (1 point), absent (0 points)
- Grimace (response to stimulation): cough or sneeze, cry and withdrawal of foot with stimulation (2 points), facial movement/grimace with stimulation (1 point), absent (0 points)
- Activity (muscle tone): active movement (2 points), limbs flexed (1 point), limp or floppy (0 points)
- Respiration (breathing): good, strong cry (2 points), irregular, weak crying (1 point), absent (0 points)
Correct Answer is A
Explanation
choice A.
Infant of an Rh-negative mother and a father who is Rh-positive and homozygous for the Rh factor.
Rh incompatibility occurs when a woman is Rh-negative and her baby is Rh-positive. This can cause hemolytic disease of the neonate (HDN), a condition where the mother’s antibodies destroy the baby’s red blood cells.
Choice B is wrong because if both the mother and the baby are Rh-negative, there is no risk of Rh incompatibility.
Choice C is wrong because if the father is heterozygous for the Rh factor, there is a 50% chance that the baby will be Rh-negative and not affected by Rh incompatibility.
Choice D is wrong because if both the mother and the baby are Rh-positive, there is no risk of Rh incompatibility.
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