FIELD: medicine.
SUBSTANCE: composition according to the invention contains a pyrimidine compound which is a substratum for dihydropyrimidine dehydrogenase or its matebolite which is a substratum for dihydropyrimidinase or β-ureidopropionase in which at least one of carbon atoms, oxygen atoms and nitrogen atoms is isotope-marked, and sugar and/or sugar alcohol. Also, the invention refers to a method for preparing said composition which involves mixing and grinding a powder material containing the pyrimidine compound and sugar or sugar alcohol to produce a powder of particle size 5 to 70 mcm.
EFFECT: invention enables diagnosing pyrimidine metabolism and ability for stomach emptying with high accuracy and small individual variations.
16 cl, 4 tbl, 5 dwg, 13 ex
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