Sequential abdominal scintigrams . with 99n1Tc − labelled rcd blood cells (RBC)were subtracted for observing asite 〔 ,f gastrointestina】bleeding alld calculat 三 ng the bleeding rate , This method is techDica11y very easy and can detect the site of bleeding with the ininimuin rate , as loW as O. 2 ml / min . , in a phantom experilnent .11123 cases with final dingnosisof gastrointestinal bleeclin9 , c6nvehtional non − subtraction scintigraphy , de亡ected only 30% (7/ 23) , but subttaction scintigraphy dctected 61% (14/ 23). It was concluded that subtraction scintigraphy had higher sensitivity 』 than conventional scintigraphy for early diagnosing of bleeding . A combina 亡 ion (,f non − subtraction and subtraction scintigraphy is recolnmended to detect a si 亡 e of gastroilltesitinal bleeding in a clinical settll 〕 9 . 1,緒 . 言
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