I applaud your insistence on obtaining factual answers. Why I wonder is it so hard to get the facts rather than placid answers. Maybe we should ask for it in writing. My experience: I had a treadmill test wherein they inject you at a certain point while you're on it. I was told it was safe. Two weeks later after a blood test I was sent to the er with end stage kidney disease. Coincidence? It certainly couldn't have helped! I was initially sent for the test due to upper back pain when exercising