As octreotide scan is a type of radionuclide scan used to find carcinoid and other types of tumors. Radioactive octreotide, a small, safe amount of a drug, is injected into a vein and travels through the bloodstream. The radioactive octreotide attaches to tumor cells that have receptors. A radiation-measuring device detects the radioactive octreotide and makes pictures showing where the tumor cells are in the body. It is also called somatostatin receptor scintigraphy and SRS.