I see the doctor every 3 months and every other time I see him I'm given chits for tests; blood, urine, this last one had x-ray of my knees, etc. and I get those done a week or two before I go see him the next 3 month scheduled appointment and we talk about them then.

If you had the test for a specific problem, then yes, you should go back and do the follow up; it isn't just about what the test showed but how you two want to decide what is showed will be treated.