Cystic fibrosis is suspected in a child with frequent respiratory infections and failure to thrive.The nurse would expect which of the following tests ordered to make a definite diagnosis?

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Cystic fibrosis is a major dysfunction of all exocrine glands that affects the lungs,pancreas,liver,and reproductive organs.The disorder is characterized by an increased viscosity of mucus,elevated sweat electrolytes,and increased enzymatic constituents in the saliva.Both parents must be carriers of the disease to pass it on to their child.The client has a chronic moist,productive cough,and frequent infections.The infant's skin tastes salty.Diagnosis is made with the sweat test.

Cystic Fibrosis Is Suspected in a Child with Frequent Respiratory