A Study Comparing Skin Fluorescence to Coronary Artery Calcification

Inclusion Criteria: * Males ≥ 45 years or females ≥ 50 years old that have had a coronary artery calcification score determined by rapid computed tomography at the clinical site within the last six months. Exclusion Criteria: * Receiving investigational treatments * Psychosocial issues that interfere with an ability to follow study procedures * Known to be pregnant * Receiving dialysis or having known renal compromise * Scars, tattoos, rashes or other disruption/discoloration on the left volar forearm. * Recent or current oral steroid therapy or topical steroids applied to the left forearm * Current chemotherapy, or chemotherapy within the past 12 months * Receiving medications that fluoresce\* * Known to have, or at risk for, photosensitivity reactions ( e.g., sensitive to ultraviolet light, or taking medication known to cause photosensitivity)