Final answer:
The assessment finding to indicate severity in this case is the presence of lactic acidosis. Immediate medical intervention is necessary.
Step-by-step explanation:
The assessment finding to indicate severity in this case is the presence of lactic acidosis. Lactic acidosis refers to a condition where there is an accumulation of lactic acid in the blood, which can occur in various medical conditions including acute lymphoblastic leukemia. It is a sign that the body's tissues are not receiving enough oxygen. In this case, the presence of lactic acidosis suggests that the condition may be more severe and immediate medical intervention is necessary.