Final answer:
Facial drooping in a sickle cell patient during a crisis is an urgent finding that could indicate a stroke, necessitating immediate reporting to a healthcare provider.
Step-by-step explanation:
The new assessment finding in a client with sickle cell disease who is currently in crises that the nurse should report immediately to the health care provider is D. Facial drooping on the right side. Facial drooping can indicate a neurological event such as a stroke, which is a serious complication of sickle cell disease due to the sickle-shaped cells blocking blood flow to the brain. The other symptoms, while also concerning and relevant to sickle cell crises, are not as immediately life-threatening as a potential stroke and therefore facial drooping warrants more urgent medical attention.