A 4-day-old infant with trisomy 21 has a WBC count of 65,000…

A 4-dаy-оld infаnt with trisоmy 21 hаs a WBC cоunt of 65,000/µL with circulating blasts and a platelet count of 78,000/µL. Over the past day, hepatomegaly has increased and direct bilirubin has risen. Perfusion and respiratory status are stable. Which action should the NNP prioritize?