Six hours after a thermal burn, the nurse obtains the following assessment data for a patient who weighs 70 kg and has a 50% total body surface area (TBSA) burn. Which information is most important to communicate to the health care provider?

A. Serous exudate is leaking from the burns: Serous exudate is expected in the first hours after a thermal burn as part of the inflammatory response and capillary permeability. While it should be monitored for infection risk, it is not immediately life-threatening. B. Urine output is 20 mL per hour for the past 2 hours: Oliguria is a critical indicator of inadequate perfusion and potential hypovolemic shock, especially in a patient with 50% TBSA burns who is in the fluid-shift phase. Low urine output signals insufficient renal perfusion and the need to adjust fluid resuscitation promptly, making it the most important data to report. C. Pulse rate of 104: Mild tachycardia is expected after burns due to pain, stress, and fluid shifts. While it should be monitored, it is less immediately critical than evidence of organ hypoperfusion such as low urine output. D. Blood pressure is 94/46 per arterial line: Hypotension in a burn patient is concerning, but early post-burn hypotension can be partially compensated by tachycardia. Urine output provides a more sensitive and direct measure of end-organ perfusion, which takes priority in communication with the provider.