If there is ongoing bleeding and the diagnosis of the site of the bleed is unknown then either a labelled red cell scan or angiography may be used. A labelled red cell scan allows detection of blood loss at rates as low as 0.1 ml/minute. Angiography cannot detect blood loss that occurs at a rate of less than 1 ml/minute. If the bleed is intermittent then both techniques may fail to localize the site of bleeding.
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