Levels of Inflammation in People With Cardiovascular Disease (POSEIDON)

Inclusion criteria: 1. Informed consent obtained before any study-related activities. Study-related activities are any procedures that are carried out as part of the study. 2. Age 18 years or above at the time of signing the informed consent. 3. Presence of ASCVD (atherosclerotic cardiovascular disease) and/or HF (heart failure) 4. Presence of serum creatinine in the medical chart within 24 months prior to signing of informed consent (for ASCVD patients only). Exclusion criteria: 1. Previous participation in this study. Participation is defined as having given informed consent in this study. 2. Current participation (i.e., signed informed consent) in any other interventional clinical study. 3. Any hospitalization or unplanned visit within the last 60 days (including exacerbation of chronic disease with hospitalization). 4. Clinical evidence, or suspicion of, active infection within the last 60 days. 5. Mental incapacity, unwillingness, or language barriers precluding adequate understanding or cooperation