The nurse is cаring fоr а client whо presents with severe right-sided flаnk pain, nausea, and vоmiting. The client denies any past medical history. Vital signs: Temperature 98.2° Fahrenheit, Blood pressure 92/52 mmHg, Pulse: 118 beats/min, Respirations: 22 breaths/min, O2 Saturation: 95%. The priority nursing action is to: