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It is normal to lose 0.5 to 1.5 ml of blood daily in the gastrointestinal tract, and melena usually is identified when more than 150 ml of blood are lost in the upper gastrointestinal tract.
One patient developed melena the day after admission, but no other bleeding was observed.
Stools are examined for melena (ie, dark tarry stools) and occult blood.
There was no history of fever, diarrhea, constipation, melena , hematochezia or urinary symptoms.
At external examination, blood smears on the body surface resulting from hematemesis or melena were present in 40 cases.
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