Somatostatin Receptor Scintigraphy

This is a test used in the diagnosis of glucagonomas. A radioactive-labelled analogue of somatostatin, indium-111 pentetreotide, is injected. This binds specifically to the somatostatin receptors of the tumour cells. X-rays then show up the area where the radiolabelled molecule is, therefore indicating where the tumour is.