Figure 3.
Algorithm for the evaluation of suspected hemophagocytic lymphohistiocytosis (HLH). ALT, alanine transaminase; CBC, complete blood count; CXCL9, C-X-C motif chemokine ligand 9; HPI, history of present illness; PE, physical examination; sCD25, soluble CD25 or soluble interleukin-2 receptor alpha.