timok,
Thank you for the question.
This test, EBCT, has good sensitivity but just okay specificity -- basically meaning that in someone without symptoms, a positive test does not necessarily imply disease. So now you are in a bit of a pickle, as my grandmother used to say.
What I do with patients who come to my clinic without symptoms, but with a high calcium score is treat them with medicines as if they have known coronary artery disease. The medicine therapies of choice are tailored based on the person's age, other medical history, etc, but could include aspirin, hypertension therapy, diabetes therapy, and cholesterol-lowering drugs. I also search out symptoms. If a person is having symptoms that they had not previously linked to their heart, then we often proceed with cardiac catheterization.
Talk to your doctor and good luck.