Laboratory Approach to the Diagnosis of Amyloidosis

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Laboratory Approach to the Diagnosis of Amyloidosis Possible Patient Presentations ■ Nephrotic-range proteinuria with or without renal insuf ciency (nondiabetic) ■ In ltrative cardiomyopathy with restrictive hemodynamics and no ischemic history ■ Hepatomegaly with no lling defects visible by imaging ■ Nondiabetic peripheral neuropathy ■ Fatigue, weight loss, dyspnea, edema, or paresthesias ■ Macroglossia ■ Classic amyloid purpura ■ Atypical myeloma ALWAYS ORDER ■ PEISO / Protein Electrophoresis and Isotype, Serum ■ MPSU / Monoclonal Protein Study, 24 Hour, Urine ■ FLCS / Immunoglobulin Free Light Chains, Serum ■ Subcutaneous Fat Aspirate (fat aspirate with Congo red stain) Subcutaneous fat aspirate: Subcutaneous fat aspirate is negative but Congo red amyloid deposits are present clinician still has high index of suspicion Diagnostic for amyloidosis Specific organ biopsy with Congo red to assess for amyloid POSITIVE NEGATIVE Diagnostic for amyloidosis To identify the type of amyloid protein: Unlikely to be amyloidosis if involved organ biopsy Acceptable specimen is paraffin-embedded tissue, order: is negative. AMPIP / Amyloid Protein Identification, Paraffin, LC-MS/MS Special instructions applying ONLY to Mayo Clinic sites in Rochester, Jacksonville, and Scottsdale/Phoenix: If specimen is fat aspirate in RPMI media, order: Amyloid Protein Identification, Fat Aspirate, LC-MS/MS Prognostic/Monitoring Tests: ■ Echocardiography-Doppler-Strain ■ CRCL / Creatinine Clearance, Serum and 24-Hour Urine ■ TRPS / Troponin T, 5th Generation, Serum ■ PBNP / NT-Pro B-Type Natriuretic Peptide, Serum ■ FLCS / Immunoglobulin Free Light Chains, Serum ■ PCPRO / Plasma Cell DNA Content and Proliferation, Bone Marrow ■ MFCF / Myeloma, FISH, Fixed Cells Note: In cases of suspected familial amyloidosis, see Amyloidosis (Familial) Test Algorithm © Mayo Foundation for Medical Education and Research (MFMER). All rights reserved. 03/2021.

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