Which screening method detects hemoglobin in stool?

Which screening method detects hemoglobin in stool?

• A. White blood cells
• B. Hemoglobin
• C. Bile acids
• D. Vitamin C

Answer: (B)

Detecting hidden blood in the stool is a screening approach for colorectal issues. The test is designed to identify hemoglobin in the stool, which signals occult bleeding from the gastrointestinal tract. This is meaningful because even small amounts of blood can point to polyps or early cancers in the colon or rectum, allowing earlier detection and intervention. Fecal occult blood tests come in two main forms: guaiac-based tests, which rely on the peroxidase activity of heme to produce a color change, and immunochemical tests, which specifically target human hemoglobin. Either form centers on detecting hemoglobin as the marker of interest. The other substances listed don’t measure this biomarker: white blood cells suggest infection or inflammation rather than bleeding; bile acids relate to digestion and aren’t used for screening bleeding in the GI tract; vitamin C can interfere with some guaiac-based tests and does not detect hemoglobin.

Detecting hidden blood in the stool is a screening approach for colorectal issues. The test is designed to identify hemoglobin in the stool, which signals occult bleeding from the gastrointestinal tract. This is meaningful because even small amounts of blood can point to polyps or early cancers in the colon or rectum, allowing earlier detection and intervention. Fecal occult blood tests come in two main forms: guaiac-based tests, which rely on the peroxidase activity of heme to produce a color change, and immunochemical tests, which specifically target human hemoglobin. Either form centers on detecting hemoglobin as the marker of interest. The other substances listed don’t measure this biomarker: white blood cells suggest infection or inflammation rather than bleeding; bile acids relate to digestion and aren’t used for screening bleeding in the GI tract; vitamin C can interfere with some guaiac-based tests and does not detect hemoglobin.