Here's the scene: It's Easter dinner, and the family's adult daughter begins choking. She doesn't want to cause a scene, so she quietly goes into another room. The rest of the family doesn't know anything is wrong until she loses consciousness and they hear her fall. They get to her and do the Heimlich, after which she starts breathing again.

So, she's not been able to breathe for long enough to pass out plus about 30 seconds. This isn't long enough to do permanent damage, but I imagine she should go to the emergency room. What would they do? Would they run tests, and which tests? Would they try to keep her overnight?