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[Quantitative determination of blood loss from the gastrointestinal tract using Metol in chronic diseases of the digestive organs].

The authors have developed a method for measuring the blood loss with feces using an available and inexpensive reagent--methyl-4-aminophenol sulphate (Metol). The diagnostic value of the method in ulcerative and hemorrhagic lesions of the alimentary tract is demonstrated, as well as its advantages over other techniques. The method helps choose a differentiated course of treatment with due regard for the hemorrhage severity.