The best investigation for the diagnosis of amyloidosis is
High-Yield Explanation
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