title: Diagnostic value of orthotolidine tablet tests in alimentary investigation.
mesh_terms: D000747:Anemia, Hypochromic / Q000175:diagnosis; D005767:Gastrointestinal Diseases / Q000175:diagnosis*; D005770:Gastrointestinal Neoplasms / Q000175:diagnosis*; D006801:Humans; D009780:Occult Blood