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 B
Explanation
The child should receive his regular dose of insulin even if he does not have an appetite. If the child is not eating as usual, he needs calories to prevent hypoglycemia. During periods of minor illness, the child with type 1 diabetes mellitus can be managed safely at home.
Choice A is wrong because giving the child half his regular morning dose of insulin can lead to hyperglycemia and ketoacidosis.
Choice C is wrong because giving the child plenty of unsweetened, clear liquids to prevent dehydration can also cause hypoglycemia.
Choice D is wrong because taking the child directly to the emergency department is not necessary unless the child has signs of severe dehydration, vomiting, abdominal
Correct Answer is ["B","C"]
Explanation
The child’s care should include adequate hydration and pain management. The management of an acute event of a vaso-occlusive crisis is the use of potent analgesics (opioids), rehydration with normal saline or Ringer’s lactate, treatment of malaria (whether symptomatic or not) using artemisinin combination therapy, and the use of oxygen via face mask, especially for acute chest syndrome.
Choice A is wrong because correction of acidosis is not a specific intervention for the vaso- occlusive crisis.
Acidosis may occur as a complication of sickle cell disease, but it is not the primary cause of the crisis.
Choice D is wrong because the administration of heparin is not recommended for the vaso-occlusive crisis.
Heparin is an anticoagulant that may increase the risk of bleeding and does not prevent or treat the sickling process.
Normal ranges for hemoglobin are 11.5 to 15.5 g/dl for children after 2 years of age.
Normal ranges for reticulocyte count are 0.5% to 1.5% for adults and 0.5% to 2.5% for children.
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