Which test is used to confirm a diagnosis of cystic fibrosis?
1Serum chloride
2Sweat chloride✓ 정답
3Urine osmolality
4Serum sodium
해설
An increased sweat chloride concentration is characteristic of cystic fibrosis and is used as the confirmatory test. Serum chloride and sodium are not diagnostic. The collection and stimulation procedure is standardized.