I know the vets I use has stool kits you can prepay and take home to collect a sample. That means you don't need to schedule an appointment, you just call and pick up the pre-labeled container, bring it home and get some poo, and then drive it back. My vet will call with the results the next day, so it's really fast. If they do find something, you might have to make an appointment. But, if you just wanna get the results of a fecal, I think you could probably do that now without the hassle (and cost) of a full checkup. I'd give them a call first, but that's how ours does it.