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
Digoxin is a medication that helps improve the pumping function of the heart and reduces fluid retention in the lungs and other tissues. It is commonly used to treat congestive heart failure in infants.
Choice A is wrong because weighing the infant every day on the same scale at the same time is a way to monitor fluid balance, not an intervention to treat excess fluid volume.
Choice B is wrong because notifying the physician when weight gain exceeds more than 20 g/day is also a monitoring measure, not an intervention. Moreover, weight gain may not accurately reflect fluid volume status in some patients with heart failure due to poor nutrition and decreased appetite.
Choice C is wrong because putting the infant in a car seat to minimize movement may worsen the respiratory distress and increase the workload of the heart. The infant should be positioned in a semi-Fowler’s or Fowler’s position to facilitate breathing and reduce venous return.
Correct Answer is ["B","D"]
Explanation
Sleepiness or fatigue and puffiness around the eyes are symptoms associated with hypothyroidism. Hypothyroidism is a condition where the thyroid gland does not produce enough thyroid hormones, which regulate the body’s metabolism and energy levels.
Choice A is wrong because weight loss is more likely to occur in hyperthyroidism, a condition where the thyroid gland produces too much thyroid hormones.
Choice C is wrong because diarrhea is also more likely to occur in hyperthyroidism, as the excess thyroid hormones speed up the digestive system.
Choice E is wrong because limited hair growth is not a specific symptom of hypothyroidism. Hair loss or thinning may occur in both hypothyroidism and hyperthyroidism, depending on the severity and duration of the condition.
Normal ranges for thyroid hormones are:
- TSH: 0.4 to 4.0 mIU/L
- T3: 100 to 200 ng/dL
- T4: 4.5 to 11.2 mcg/dL
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