TTR and prealbumin measurement: AL, amyloid light chain amyloidosis; ATTR, transthyretin amyloidosis; ATTRv, variant transthyretin amyloidosis; ATTRwt, wild‐type transthyretin amyloidosis; CA, cardiac amyloidosis; CPET, cardiopulmonary exercise testing; VE, minute ventilation; VE/VCO2 slope, ventilatory efficiency; VO2, oxygen uptake.