Screening Bloodwork Recommendations for a Healthy Adult
General Screening Recommendations by Age
- For a healthy adult without risk factors, lipid screening is not routinely recommended until age 40, while those with risk factors should begin screening at age 20, according to the Mayo Clinic Proceedings and other guidelines 1, 2
- The American College of Cardiology strongly recommends lipid testing for all adults 40-75 years 2
- For adults under 40 years not taking lipid-lowering therapy, a lipid profile should be obtained at initial evaluation and every 5 years thereafter if no risk factors are present 2
- For men aged 20-35 years without risk factors, routine lipid screening is not recommended, but screening is recommended for men 20-35 years only if they have risk factors for coronary heart disease 3, 2
Risk Factors That Warrant Earlier Screening
- Diabetes is a risk factor that warrants earlier screening at age 20 3, 2
- Family history of cardiovascular disease before age 50 in male relatives or age 60 in female relatives is a risk factor that warrants earlier screening at age 20 3
- Multiple risk factors for coronary heart disease, such as tobacco use and hypertension, warrant earlier screening at age 20 3, 1
- Obesity is a risk factor that may warrant earlier screening 4
A1c Screening Recommendations
- For adults without risk factors, A1c testing should begin at age 40-70 years with BMI ≥25 kg/m² 4
- In those without any risk factors, testing should begin at age 45 years 4
- More frequent testing is appropriate for those with diabetes 2
Screening Intervals
- For those who require screening, a reasonable interval is every 5 years 3, 2
- Shorter intervals are appropriate for persons with lipid levels close to treatment thresholds 3, 2
- Longer intervals may be appropriate for those with repeatedly normal lipid levels 3
Important Considerations for Screening
- Total cholesterol and HDL levels can be measured on non-fasting samples 3
- Abnormal results should be confirmed by a repeated sample on a separate occasion 3
- The average of both results should be used for risk assessment 3
- In patients with elevated risk on screening, lipoprotein analysis including fasting triglyceride levels may be useful for choosing optimal treatments 3
Common Pitfalls to Avoid
- Relying on a single lipid measurement for diagnosis or treatment decisions 3
- Screening all young adults regardless of risk factors, which may lead to unnecessary testing 2
Lipid Screening and Cardiovascular Risk Assessment
Introduction to Lipid Screening
- The American College of Cardiology and American Heart Association guidelines state that advanced lipoprotein testing beyond a standard fasting lipid profile is not recommended for cardiovascular risk assessment in asymptomatic adults, classified as Class III: No Benefit 5, 6, 7
Standard Lipid Profile Components
- A standard fasting lipid profile should include total cholesterol, HDL cholesterol, triglycerides, and LDL cholesterol (calculated by Friedewald equation if triglycerides <300 mg/dL, or measured directly) 8, 9, 10
Risk Factors That Warrant Earlier Screening
- Current cigarette smoking is a risk factor that warrants earlier screening for lipid testing 10
- Hypertension (BP ≥140/90 mm Hg or on antihypertensive medication) is a risk factor that warrants earlier screening for lipid testing 10
Important Technical Considerations
- In patients with elevated screening results, lipoprotein analysis including fasting triglycerides may provide useful information for treatment selection 11
Risk Assessment Integration
- Once lipid screening is performed, results should be integrated into a global cardiovascular risk score that combines multiple risk factors into a single quantitative estimate to guide preventive interventions 5, 6, 7
- Treatment decisions should account for overall cardiovascular risk, not lipid levels in isolation 11, 12