Not sure if you need urgent care or an emergency room (ER)? Choose an OU Health ER & Urgent Care in Yukon. Get the walk-in and shorter-wait-time convenience of urgent care – available 7 a.m. to 8 p.m. daily – combined with all the medical expertise of an emergency room that’s open 24/7. Get both full-service ER and urgent care with on-site laboratory, CT scans, X-ray and ultrasound. All in one place.