For at udføre testen skal der bruges 200 ml 100% appelsinjuice eller 1 g citronsyre i 200 ml vand (som et preadministreret testmåltid) samt almindeligt postevand (til opløsning af 13C- urinstof pulver).
For performance of the test, 200 ml 100% orange juice or 1 g citric acid in 200 ml water for patients from the age of 12 and older (as a pre-administered test meal), as well as tap water (for dissolving the 13 C-urea powder) are necessary.