FIELD: medicine. SUBSTANCE: method involves introducing in vivo carbamide into organism and controlling its hydrolysis with gas analysis measurements. In breathing through nose, breathing frequency, or volume discharge rate of exhaled air or carbon dioxide contents of normal isotope composition and/or ammoniac contents of normal isotope composition is determined before and after introducing carbamide. Increments of the mentioned parameters relative to their initial values are interpreted in terms of urease activity availability. EFFECT: high reliability and accuracy of diagnosis method. 6 cl, 1 dwg
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