Table 1.

CNS status definitions [71, 129–131].

	CSF cytospin findings
CNS status	WBCs/μL	RBCs/μL	Leukemic blasts
CNS1	≤5	<10	Absent
CNS2	≤5	<10	Present
CNS3	>5	<10	Present
TLP+	N/A	≥10	Present
TLP−	N/A	≥10	Absent

CNS central nervous system, CSF cerebrospinal fluid, N/A not applicable, RBCs red blood cells, TLP traumatic lumbar puncture, WBCs white blood cells.