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 C
Explanation
Visible peristalsis and weight loss. These are symptoms of pyloric stenosis, which is a thickening or narrowing of the pylorus, a muscle in the stomach that blocks food from entering the small intestine. Babies with pyloric stenosis often have forceful vomiting, which may cause dehydration.
Choice A is wrong because abdominal rigidity and pain on palpation are not typical signs of pyloric stenosis.
They may indicate other conditions such as appendicitis or bowel obstruction.
Choice B is wrong because a rounded abdomen and hypoactive bowel sounds are also not specific for pyloric stenosis.
They may be seen in other causes of vomiting or abdominal distension.
Choice D is wrong because distention of the lower abdomen and constipation are not related to pyloric stenosis.
They may be due to other problems such as Hirschsprung’s disease or intestinal atresia. Normal ranges for weight gain in infants depend on their age, sex, and feeding method. Generally, infants should gain about 25 to 35 grams per day in the first 3 months of life.
Correct Answer is D
Explanation
Therapeutic management includes the administration of gamma globulin and aspirin. This is because Kawasaki disease causes inflammation in the walls of small to medium-sized blood vessels that carry blood throughout the body and can lead to complications such as coronary artery aneurysms. Gamma globulin is an intravenous immunoglobulin that can reduce the risk of these complications, and aspirin can help lower fever and inflammation.
Choice A is wrong because the child’s fever is usually not responsive to antibiotics within 48 hours. Kawasaki disease is not caused by a bacterial infection, so antibiotics are not effective.
Choice B is wrong because the principal area of involvement is not the joints. Kawasaki disease affects mainly the blood vessels, but it can also cause swelling in glands (lymph nodes) and mucous membranes inside the mouth, nose, eyes and throat. Joint pain or swelling may occur, but it is not the main feature of the disease.
Choice C is wrong because aspirin is not contraindicated. Aspirin is part of the standard treatment for Kawasaki disease, along with gamma globulin. However, aspirin should be used with caution and under medical supervision, as it can cause Reye’s syndrome in children with viral infections.
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