The Centers for Disease Control and Prevention (CDC) recommends that adolescents (ages 9 to 11) and young adults (ages 17 to 21) undergo lipid testing at least once during these age ranges. After this, the American Heart Association recommends cholesterol testing once every 4 to 6 years.
However, a doctor may recommend more frequent screening if you're at high risk for hyperlipidemia based on family history or lifestyle choices.