See also:
     Bloody stool Ddx
Causes of false positives
     Ingestion of 
          Red fruits 
          Meats
          Methylene blue
          Chlorophyll
          Iodide
          Cupric sulfate preparations
          Cupric bromide preparations
Causes of false negatives
     Bile
     Ingestion of magnesium-containing antacids or ascorbic acid
Causes of bloody-looking stool
     Red Jell-O
     Tomato sauce
     Wine
     Iron therapy
     Pepto-bismol

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The Compendium platform was created by David Kwinter, MD, CCFP(EM).