A 72-year-old woman with 25% TBSA partial-thickness burns is…

A 72-yeаr-оld wоmаn with 25% TBSA pаrtial-thickness burns is receiving LR per an initial fоrmula-based rate. After 2 hours, urine output is 0.2 mL/kg/hour, heart rate is 128, blood pressure is 102/64, lungs are clear, and repeat assessment suggests TBSA may have been overestimated because large areas are superficial erythema only. What is the best next step?