Table 5.

Conditions Mistaken for Blood in the Stool

Hematemesis
• Commercial dyes #2 and #3 (“Frankenberry Stool”)
• Swallowed maternal blood at delivery or during breastfeeding
• Bleeding from the nose, mouth, or pharynx
• Swallowed nonhuman blood
Melena
• Iron preparations
• Licorice
• Blueberries
• Spinach
• Beets
• Bismuth (eg, Pepto-Bismol)
• Lead
• Charcoal
• Dirt
• Swallowed non-human blood
Hematochezia
• Menstruation
• Commercial dyes #2 and #3
• Ampicillin
• Hematuria