PillSense Use in Anemia and Hemoccult

Inclusion Criteria: * Age 18 years or older * Able to provide informed consent * Hospitalized patients who have been referred to the gastroenterology service for: A positive hemoccult (fecal occult blood test) and/or Anemia, In the absence of overt gastrointestinal bleeding - Overt gastrointestinal bleeding is defined as the presence of: Melena (black, tarry stools) Hematochezia (bright red blood per rectum) Hematemesis (vomiting blood) Exclusion Criteria: * Hemodynamic instability, defined as: Systolic blood pressure \< 90 mm Hg Pulse \> 120 bpm * Presence of overt gastrointestinal bleeding (melena, hematochezia, or hematemesis) * Conditions that might contraindicate use of an ingestible capsule, such as: Dysphagia or odynophagia Swallowing disorder Altered mental status Zenker's diverticulum Crohn's disease Previous GI surgery Suspected ileus or bowel obstruction GI perforation GI motility disorders (e.g., esophageal dysmotility, gastroparesis) \- Known upper GI pathology, such as: Esophageal or gastric cancer Recent upper GI ulcer bleeding (within 3 months) Recent upper GI procedures or surgeries * Presence of a cardiac implantable electronic device (CIED) * Pregnant or lactating women * Planned MRI before capsule excretion