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Guaiac fecal occult blood test (gFOBT) sensitivity and specificity in detection of gastrointestinal bleeding following pinch biopsies of the stomach, duodenum, and colon. Test sensitivity and specificity were evaluated on the basis of several fecal collection protocols: any single fecal collection (1 sample), any two samples collected 12 h apart (2 × 12), any two samples collected 24 h apart (2 × 24), and any three samples collected 24 h apart (3 × 24)
