Delta 10 ppm versus delta 20 ppm: a reappraisal of diagnostic criteria for breath hydrogen testing in children.

Abstract

A rise of breath H2 concentration of > or = 20 ppm over baseline appears to correlate better with subsequent symptom development than does > or = 10 ppm. However, the frequently poor association between symptoms of lactose intolerance and breath H2 excretion suggest caution in the interpretation of the clinical significance of the BHT.