TTR and axial length measurement: The prevalence of renal amyloidosis in the largest series of native kidney biopsies is 1.6%, with light chain (LC) amyloid (AL) identified in 81%–86% of cases, amyloid serum A protein (AA) in 7%, and leukocyte chemotactic factor 2 (ALECT2) in 2.5%–2.7%.1 Transthyretin amyloid (ATTR), which predominantly affects the nerves and heart, can infrequently involve kidneys.