A New Modification of the Fluorescein String Test for Rapid Localization of Upper Gastrointestinal Bleedings

Diagnostic procedure in bleeding of obscure origin from the alimentary canal

“…As this is not the case when a plastic tube is used, the injury to the cardia must be ascribed to the string. By enclosing the string in a plastic tube (Valtonen, 1967) having a large number of holes along its length it should be possible to eliminate this serious disadvantage of the string test.…”