Diagnostic agent

Abstract

A diagnostic agent for being sprinkled to the inner wall of a gastrointestine in endoscopic observation, comprising an acidic aqueous solution of pH 1 to 5 containing a colorant and also containing at least one acid selected from the group consisting of a carboxylic acid, hydrochloric acid, sulfuric acid and phosphoric acid. By sprinkling such a diagnostic agent to the inner wall of a gastrointestine in endoscopic observation, it is possible to clearly observe a lesion which is difficult to be determined. In particular, it is suitable for observing lesions having cancer cells in the stomach or the Barrett's esophagus.

1 . A diagnostic agent for being sprinkled to the inner wall of a gastrointestine in endoscopic observation, comprising an acidic aqueous solution of pH 1 to 5 containing a colorant. 
   
   
       2 . The diagnostic agent of  claim 1 , wherein the colorant is an intermediate color or cool color colorant. 
   
   
       3 . The diagnostic agent of  claim 1 , wherein the acidic aqueous solution contains at least one acid selected from the group consisting of a carboxylic acid, hydrochloric acid, sulfuric acid and phosphoric acid. 
   
   
       4 . The diagnostic agent of  claim 3 , wherein the acid is at least one carboxylic acid selected from the group consisting of acetic acid, malic acid and citric acid. 
   
   
       5 . The diagnostic agent of  claim 3 , wherein the concentration of the carboxylic acid is 0.01 to 1 mol/L.