Diagnostic criteria for HLH-LT and swimmer plot of patients with HLH-LTs. Diagnostic criteria for carHLH described previously and criteria for HLH-LT used in the current study. (B) Swimmer’s plot depicting clinical course and outcomes of patients that met criteria for HLH-LT, with those having peak ferritins ≥100 000 ng/mL shown in red, those with peak ferritins 10 000 to 100 000 ng/mL shown in blue. ∗indicates that cause of death in 2 patients noted to be from respiratory failure as well as leukemia.