Which test is most sensitive for detecting an upper GI bleed?

Which test is most sensitive for detecting an upper GI bleed?

• A. Stool Occult Blood
• B. Nasogastric Lavage
• C. Coagulation studies (PT/INR and PTT)
• D. Esophagogastroduodenoscopy

Answer: (B)

Detecting an upper GI bleed relies on finding evidence of blood in the stomach or ongoing hemorrhage. Washing out the stomach with a nasogastric tube allows direct assessment of gastric contents. If there is active bleeding above the duodenum, the aspirate will often show gross blood, clots, or coffee-ground material, giving a high sensitivity for detecting an upper GI bleed. In contrast, stool occult blood tests may miss recent or intermittent bleeding and only reflect blood that has passed through the entire GI tract, while coagulation studies assess clotting function rather than the presence of active bleeding. Esophagogastroduodenoscopy directly visualizes the mucosa and can identify and treat the source, but for the question of detecting a bleed, sampling gastric contents with nasogastric lavage provides the most sensitive signal among the options.

Detecting an upper GI bleed relies on finding evidence of blood in the stomach or ongoing hemorrhage. Washing out the stomach with a nasogastric tube allows direct assessment of gastric contents. If there is active bleeding above the duodenum, the aspirate will often show gross blood, clots, or coffee-ground material, giving a high sensitivity for detecting an upper GI bleed. In contrast, stool occult blood tests may miss recent or intermittent bleeding and only reflect blood that has passed through the entire GI tract, while coagulation studies assess clotting function rather than the presence of active bleeding. Esophagogastroduodenoscopy directly visualizes the mucosa and can identify and treat the source, but for the question of detecting a bleed, sampling gastric contents with nasogastric lavage provides the most sensitive signal among the options.