The best investigation for the diagnosis of amyloidosis is
Diagnosis Microscopic examination - biopsies from kidney, gingiva, rectum Congo red staining on abdominal fat aspirates Serum & urine protein electrophoresis Bone marrow aspiration - to r/o plasmacytosis Scintigraphy with radiolabelled serum amyloid P (SAP) component
Colonoscopy
Rectal biopsy
Upper GI endoscopy
CT scan
General pathology