"Testing 1-2-3" is the twenty-fourth episode of the third season of Grey's Anatomy and the 60th produced episode of the series. It is also the 60th produced episode of the Grey's Anatomy franchise. It was broadcast on May 10, 2007.
The interns face the biggest challenge in their careers, their first-year medical exams and the other interns worry that Meredith’s recent breivment will hinder her ability to sucseed. Callie’s suspicions of George and Izzie intensify after he is accepted into Mercy West while Adele stuns Addison with news she must keep from the Cheif. Cristina finds writing her wedding more difficult than she first imagined and Alex and Ava have a disagreement when her memory returns.
- "A surgeons education never ends. Every patient, every symptom, every operation is a test: a chance for us to demonstrate how much we know and how much more we have to learn."
- "The Rope Is Long" - Let's Go Sailing
- "Wake Up Alone" - Amy Winehouse
- "Corner Of Your Heart" - Ingrid Michaelson
- "Stains of Saints " - The Weather Machines
- "Million Faces" - Paolo Nutini
This episodes' title references the song Testing 1-2-3, originally sung by Barenaked Ladies
- This episode marks the first appearance of Lexie Grey
- This episode features no closing voiceover.