Procedure - hemaprompt.com Fecal and Gastric Occult Blood Tests, Fecal Occult Blood Tests, Gastric Occult Blood Tests, Point Of Care Occult Blood Tests, HemaPrompt FG, HemaPrompt, Aerscher Diagnostics HemaPrompt TM FG Fecal & Gastric Occult Blood Testing Procedure. Principle of the Test Blood in the feces is often the first and only sign of colonic or rectal malignancy. Blood found in gastric contents may be used for early detection of …