The nurse is reviewing the results of a sweat test taken from a child with cystic fibrosis. Which finding supports the clients diagnosis?

A sweat potassium concentration less than 40mEq/L A sweat chloride concentration greater than 60mEq/LA sweat potassium concentration greater than 40mEq/LA sweat chloride concentration less than 40mEq/L

Explanation.

The child with cystic fibrosis has sweat concentrations of chloride greater than 60mEq/L. Answers A and C are incorrect because they refer to potassium concentrations that are not used in making a diagnosis of cystic fibrosis. Answer D is incorrect because the sweat concentration of chloride is too low to be diagnostic.