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Nuclear medicine red blood cell (bleeding) scan: Red blood cells of the patient have been marked with a radioactive substance that the camera can see. When the tagged cells are injected into the patient's blood stream, they get carried away. If there is a spot of active bleeding inside the patient, the cells will leak out and collect at the point of leakage. 9 images of a patient's belly were taken, with about 10 minutes time between each image. The increasing vertical black line in the left lower part of the image (arrow), which gets denser over time, represents active bleeding at the beginning of the large bowel.

Note: Images are shown for illustrative purposes. Do not attempt to draw conclusions or make diagnoses by comparing these images to other medical images, particularly your own. Only qualified physicians should interpret images; the radiologist is the physician expert trained in medical imaging.