In most cases requiring emergency hospital admission, the bleeding will resolve spontaneously. If a patient is suspected of having severe blood loss they will most likely be placed on a vital sign monitor and administered oxygen either by nasal cannula or simple face mask. An intravenous catheter will be placed into an easily accessible area and IV fluids will be administered to replace lost blood volume. Endoscopic evaluation with a colonoscopy (and possibly an esophagogastroduodenoscopy to exclude an UGIB) should typically occur within 24 hours of hospital presentation.