Sweat Sodium Related to Amount of Sweat after Sweat Test in Children with and without Cystic Fibrosis

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Abstract
The sweat concentration of sodium was found to be inversely correlated with the amount of sweat obtained after a sweat test according to the method of Gibson & Cook in children without and with cystic fibrosis. Reference intervals for sweat sodium overlapped for the two groups but two‐dimensional reference distributions for the amount of sweat (range 20‐440 mg) correlated with its sodium content were completely separated. The establishment of similar distributions in centres carrying out sweat tests could serve to assess the performance of this investigation at local level.