A nurse is reinforcing teaching about diagnostic tests with the parents of a child who has suspected cystic fibrosis. Which of the following diagnostic tests should the nurse include as the most definitive when diagnosing cystic fibrosis?
Pulmonary function test
Sweat chloride test
Stool fat content analysis
Sputum culture
The Correct Answer is B
A. Pulmonary function test:
Pulmonary function tests (PFTs) assess lung function by measuring airflow, lung volume, and gas exchange. While PFTs can provide valuable information about respiratory function, they are not specific to cystic fibrosis and may show abnormalities consistent with various respiratory conditions. However, PFTs are often performed in individuals with cystic fibrosis to monitor lung function over time and assess response to treatment. They are not considered the most definitive test for diagnosing cystic fibrosis.
B. Sweat chloride test:
This option is correct. The sweat chloride test is considered the most definitive diagnostic test for cystic fibrosis. It measures the concentration of chloride in sweat, which is typically elevated in individuals with cystic fibrosis due to defective chloride transport in sweat glands. A sweat chloride concentration above a certain threshold (usually ≥60 mmol/L) is diagnostic of cystic fibrosis, particularly when confirmed with repeat testing.
C. Stool fat content analysis:
Stool fat content analysis evaluates fat absorption and fecal fat excretion, which may be impaired in individuals with cystic fibrosis due to pancreatic insufficiency. However, while stool fat content analysis can provide supportive evidence of malabsorption in cystic fibrosis, it is not considered the most definitive test for diagnosing the condition. Stool fat content analysis is often used in conjunction with other diagnostic tests to assess pancreatic function and nutritional status in individuals with cystic fibrosis.
D. Sputum culture:
Sputum culture involves culturing respiratory secretions to identify bacterial pathogens, which can be useful for diagnosing respiratory infections in individuals with cystic fibrosis. However, sputum culture is not specific to cystic fibrosis and may show similar findings in other respiratory conditions. While respiratory cultures are important for guiding treatment in cystic fibrosis, they are not considered the most definitive test for diagnosing the condition.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is D
Explanation
A. Instruct the client to cough. Coughing is generally encouraged after chest physiotherapy to help expel loosened secretions, but it is not the first action. The bronchodilator should be administered first to maximize the effectiveness of the chest physiotherapy.
B. Perform vibration while the client exhales slowly through the nose. Vibration is a component of chest physiotherapy used to help loosen secretions during exhalation, but it is performed after the bronchodilator is administered and once the client is positioned properly.
C. Percuss the upper posterior chest.Percussion helps to mobilize secretions but is typically done after the bronchodilator has been administered to allow for more effective airway clearance.
D. Administer albuterol by nebulizer.Administering albuterol first dilates the airways, making it easier to mobilize and clear secretions during percussion, vibration, and postural drainage.
Correct Answer is ["A","D"]
Explanation
A. Inwardly turned foot on the affected side.
This finding is consistent with DDH. In infants with DDH, the affected leg may appear shortened and rotated inwardly due to hip instability or dislocation.
B. Lengthened thigh on the affected side.
This finding is not typically associated with DDH. In fact, the affected thigh may appear shortened rather than lengthened due to abnormal positioning of the hip joint.
C. Absent plantar reflexes.
Absent plantar reflexes are not directly related to DDH. Plantar reflexes assess the function of the spinal nerves in the lower extremities and are not typically affected by hip dysplasia.
D. Asymmetric thigh folds.
This finding is consistent with DDH. Asymmetric thigh folds, where one thigh appears fuller or has more skin folds compared to the other, can be indicative of hip dysplasia. The skin folds may be more prominent on the unaffected side due to the displacement of the femoral head on the affected side.
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