A nurse is preparing a 9-year-old child for an IV catheter insertion. Which of the following actions should the nurse take first?

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.

A. Measure the elixir in a medicine cup before transferring to a syringe:

This option involves measuring the medication using a medicine cup before transferring it to an oral medication syringe. While measuring the medication accurately is important, transferring it from a medicine cup to a syringe introduces an extra step that may increase the risk of spillage or dosage error. It's generally more efficient and accurate to directly draw the medication into the oral syringe.

B. Place the infant supine in a crib prior to administration:

Placing the infant in a supine (lying flat on the back) position in a crib prior to administering oral medication is not recommended, particularly for infants of this age. This position increases the risk of choking or aspiration, as it may cause the medication to flow toward the back of the throat rather than being swallowed properly. It's safer to administer oral medication to infants in an upright or slightly reclined position.

C. Position the syringe to the side of the infant's tongue:

This is the correct choice. Positioning the syringe to the side of the infant's tongue helps facilitate swallowing and reduces the risk of choking or aspiration. Placing the syringe toward the cheek allows the infant to more easily swallow the medication, as it minimizes the chance of the medication flowing toward the back of the throat.

D. Mix the medication with 10 mL of formula:

Mixing medication with formula is not a standard practice for administering oral medication using an oral syringe, particularly without specific instructions from the healthcare provider. Mixing medication with formula may alter the medication's effectiveness and is unnecessary for most oral medications. It's important to administer oral medication directly using an oral syringe to ensure accurate dosing and effectiveness.