AMBOSS says beginning at 20 you do lipid screens. https://next.amboss.com/us/article/4o03XS?utm_medium=anki&utm_source=navbar#Lf260c45e333a29be0158780d38b3d0fa
Amboss question explanation also says start at 20 and do every 4-6 years. Once 40, the screening interval can be shortened based on the individual ASCVD risk
2019 ACC/AHA guidelines also recommend this, and USPFTF as of 2022 follow those guidelines:
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7685565/
https://www.uspreventiveservicestaskforce.org/uspstf/recommendation/statin-use-in-adults-preventive-medication#fullrecommendationstart
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