[Causes of error in the determination of occult fecal blood].
D005243:Feces; D006471:Gastrointestinal Hemorrhage / Q000175:diagnosis*; D006138:Guaiac; D006470:Hemorrhage; D006801:Humans; D009780:Occult Blood
D006138:Guaiac
FECES; HEMORRHAGE, GASTROINTESTINAL/diagnosis