This is a useful article in evaluation of elevated ferritin levels in adults. This approach is NOT applicable in young children but may have some use in adolescents. In young children, other considerations include HLH and macrophage activation. In newborns, elevation of ferritin (along with liver dysfunction) may be indicative of GALD (gestational alloimmune liver disease).
W. Palmer et al. AJG 2020; 115: 1353-55. How I Approach Patients With Elevated Serum Ferritin