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.
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Related Questions
Correct Answer is C
Explanation
A. "I will restrict the amount of salt in my child's meals."
Restricting salt intake is not typically recommended for children with cystic fibrosis (CF). In fact, individuals with CF often have increased salt requirements due to excessive salt loss through sweat. Restricting salt intake could potentially lead to electrolyte imbalances. Therefore, this statement does not demonstrate an understanding of the dietary management necessary for CF.
B. "I will put my child in daycare to ensure that she socializes with other children."
While socialization is important for a child's development, placing a child with CF in daycare may increase their risk of exposure to respiratory infections, which can be particularly dangerous for individuals with CF due to their compromised respiratory function. Therefore, this statement does not demonstrate an understanding of the infection control measures necessary for managing CF.
C. "I will make sure my child washes her hands before eating.”
This statement demonstrates an understanding of infection control measures, which are crucial for individuals with CF to reduce the risk of respiratory infections. Washing hands before eating helps prevent the transmission of bacteria and viruses that can cause respiratory infections. Therefore, this statement indicates an understanding of an important aspect of managing CF.
D. “I will provide low-fat meals for my child."
Providing low-fat meals is not typically recommended for children with CF. CF often leads to malabsorption of fats, so a diet high in calories and fat is typically recommended to ensure adequate nutrition and weight gain. Therefore, this statement does not demonstrate an understanding of the dietary recommendations necessary for managing CF.
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.
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