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 ["B","C"]
Explanation
A. "You should begin to manipulate the infant's bedtime based on the hospital's visiting hours."
This statement is incorrect. Manipulating the infant's bedtime based on hospital visiting hours may disrupt the infant's regular sleep schedule, potentially causing discomfort and distress. It's important to maintain the infant's routine as much as possible to promote comfort and well-being.
B. "You should bring the infant's favorite blanket to the hospital."
This statement is correct. Bringing the infant's favorite blanket or comfort item can provide familiarity and comfort during the hospital stay. Having familiar items from home can help soothe the infant and reduce anxiety associated with the new environment.
C. "You should read the child a story about hospitalization."
This statement is correct. Reading a story about hospitalization to the child can help prepare them for the upcoming experience and alleviate fear or anxiety. Choosing age-appropriate books that explain what to expect during a hospital stay can help normalize the experience and provide reassurance to the infant and parents.
D. "You will need to go home when it is not visiting hours."
This statement is incorrect. Parents are typically allowed to stay with their infant throughout the hospitalization, especially in the case of pediatric patients. Family presence is important for providing comfort and support to the infant and facilitating bonding during the hospital stay.
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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