For at udføre testen skal der bruges 100 ml 100% appelsinjuice (som et preadministreret testmåltid) samt almindeligt postevand (til opløsning af 13C- urinstof pulver).
For performance of the test, 100 ml 100% orange juice for patients from the age of 3 to 11 (as a pre- administered test meal), as well as tap water (for dissolving the 13C-urea powder) are necessary.