A father brings his 1-year-old son to the clinic and states that when he kisses the child's cheek, it tastes salty. Which diagnostic test does the nurse educate the father on based on the father's statement?
A.
Large bowel barium series
B.
Pancreatic enzyme analysis
C.
Pulmonary function studies
D.
Quantitative sweat chloride test
ANS: D
Salty-tasting sweat and tears are a characteristic finding in cystic fibrosis. The diagnostic test for this disorder is the quantitative sweat chloride test. Pancreatic enzyme studies are invasive and not usually performed on children. Pulmonary function studies are done in older children who can cooperate. Large bowel barium studies are not needed.
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