FIELD: medicine. SUBSTANCE: essence of this method resides in that test solution containing prescribed amounts of marker and electrolytes and having constant pH value is continuously administered at constant rate of 150 to 200 ml/h via proximal passage of dual-gap probe, contents of stomach are continuously aspirated and measured, pH value and concentration of marker in stomach contents are determined and final results of acidic products are calculated by prescribed formulae with regard to concentration of marker in stomach contents. EFFECT: higher accuracy of diagnosis owing to improved aspiration and accurate measurement of quantity of juice that remained in stomach or amount of juice evacuated into duodenum. 1 tbl
