SAP scan (original) (raw)

A SAP scan is a type of nuclear medicine imaging test which uses iodine-123 (123I) and serum amyloid P component (SAP) to diagnose amyloidosis. In patients with amyloidosis, large deposits of SAP coat the affected organs, in addition to the low levels normally found in the blood stream. The injected 123I-SAP localises specifically to amyloid deposits, showing up as hot spots in the image.