Table 6. Other non-invasive biomarkers.

Author, year	Population	Study	Biomarkers	Outcome
Leung et al, 2013 (48)	11Children and adults	Prospective study	FeNO	No supporting role for FeNO determination in the management of EoE
Lanz et al, 2012 (49)	55Children and adolescents	Case-control study	FeNO	Measurement of FeNO does not help identify EoE from GERD
Moye et al, 2019 (50)	24Children and adolescents	Prospectivecase-controlstudy	Plasmametabolomicsprofile	Notable candidate biomarkers include dimethylarginine, putrescine, and N-acetylputrescine
Cunnion et al, 2016 (51)	75Children and adults	Case-control study	Urinary 3-BT	Median normalized 3-BT levels were increased 93-fold in patients with EoE compared to controls

BT, bromotyrosine; FeNO, Fractionated exhaled nitric oxide; GERD, gastroesophageal reflux disease.