False-positive results for ATTR-CA may occur in: AL-amyloidosis, hydroxycloquine-induced restrictive cardiomyopathy, rare variants of CA associated with chronic kidney disease (AapoAI, AApoAII, ApoAIV or Aβ2M amyloidosis) or in radiotracer persistence in the blood pool. The gene discussed is APOA4; the disease is chronic kidney disease.