False positive sweat test, malnutrition, and the Mauriac syndrome.

Mauriac syndrome is characterised by hepatomegaly, glycogen infiltration of the liver, retarded 
sexual maturation, and short stature in diabetic children. We report the 
first example of Mauriac syndrome, in a patient clinically malnourished and 
edematous, who had a transient false positive sweat test. Malnourished children 
who have a positive sweat test should have repeated sweat tests 
once the malnourished state has been reversed. This would eliminate error 
in the diagnosis of cystic fibrosis. 