A quantitative sweat chloride test has been done on an 8-month-old child.What value should be indicative of cystic fibrosis (CF)?
A) Less than 18 mEq/L
B) 18 to 40 mEq/L
C) 40 to 60 mEq/L
D) Greater than 60 mEq/L

Question

Quizplus · Accepted Answer

Normally sweat chloride content is less than 40 mEq/L,with a mean of 18 mEq/L.A chloride concentration greater than 60 mEq/L is diagnostic of CF; in infants younger than 3 months,a sweat chloride concentration greater than 40 mEq/L is highly suggestive of CF.

A Quantitative Sweat Chloride Test Has Been Done on an 8-Month-Old