All of the following can be used in the diagnosis of cystic fibrosis EXCEPT:
a. an elevated potassium level in the sweat.
b. an elevated chloride level in the sweat.
c. genetic testing of the patient and/or parents.
d. chronic lung infections from an early age.
A
There is no change in the potassium level in the sweat. All of the other listed options can be used to help in the diagnosis of a person with cystic fibrosis.
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