The terminology of atherosclerosis means hardening of artery. Manifestation of atherosclerosis are coronary artery disease, stroke or blocked blood leg arteries. Effectiveness of chelation therapy to atherosclerosis is about 90% proved by objective testing. Objective testing meaning by specific diagnostic procedure such as by angiography (to heart, legs, neck or brain arteries), CT angiogram, thallium scan or radio-isotope study, cardio-cartograph, doppler ultra-sound, cardiac exercise stress test or even resting ECG for the heart. Subjective improvement is not enough to prove the effectiveness.