For those physicians who do use same day booking as part of their practice this is what it means: each day that these physicians work in the clinic, there will be some appointments that have been pre-booked for patients, and there will be some appointments that are held open until that morning (this means you have to phone each morning your family physician is working to book a same day booking). These appointments are there to help patients who have become suddenly ill and need urgent care. If you have a chronic issue it is preferable if you pre-book an appointment ahead of time.