A Nurse Works on a Pediatric Oncology Unit $1 / 4$

A nurse works on a pediatric oncology unit.After receiving report,which child should the nurse assess first?

A) Having infusion of D5 $1 / 4$ NS and sodium bicarbonate
B) On high-dose methotrexate (Rheumatrex) ,urine pH of 7.8
C) Receiving cyclophosphamide (Cytoxan) ,urine specific gravity of 1.008
D) 2 days post-tumor resection,complaining of pain