simple blood test showed possibility of blockage in heart

After my annual check up, I was alerted to the fact that I had possible heart blockage. As a follow up, Dr. Janz sent me to a local heart specialist. A stress test gave reason for concern which led to a heart test and resulted in a stint for me. Had showed no signs of trouble health wise but the initial test by Dr. Janz led to discovery of the 90+% blockage. He does't understand why, but am still riding my horse at the age of 83...Thanks DOC !!