Understanding Cholesterol Tests: Beyond the Numbers for Heart Health

High cholesterol can exist for years without noticeable symptoms, often only appearing in routine blood tests and then being forgotten. This silent progression can lead to the gradual development of atherosclerosis, a condition where plaque builds up in artery walls, potentially causing heart attacks or strokes. While the distinction between "good" (HDL) and "bad" (LDL) cholesterol is common knowledge, interpreting the actual test results is more complex, according to experts Prof. Avishai Groper and Prof. Avishai Elis.

The primary goal of cholesterol testing and treatment is not just to improve numbers but to identify and manage vascular disease risk before a first major cardiovascular event. LDL cholesterol is a significant contributor to atherosclerosis; higher levels increase the likelihood of plaque buildup. While HDL cholesterol helps remove excess cholesterol, its level alone doesn't guarantee protection, and very low levels are considered a risk factor. Doctors aim to lower LDL, but the target level depends on an individual's overall risk profile.

Interpreting cholesterol results requires looking beyond the standard lab ranges. A result considered normal for a healthy young person might necessitate medical intervention for an older individual with diabetes, high blood pressure, or a history of heart disease. Doctors consider factors like age, blood pressure, blood sugar, lifestyle, and family history when determining personalized treatment goals. Risk calculators can estimate an individual's atherosclerosis risk and guide LDL target levels, which can range from below 130 mg/dL for the general population to below 55 mg/dL for those at very high risk.

Lipid profile tests measure LDL, HDL, and triglycerides. Experts recommend initial testing in childhood or before military service, with follow-up frequency determined by individual risk factors. A less common but important test is for Lipoprotein(a) or Lp(a), a genetically determined particle that significantly increases heart attack and stroke risk. While not directly treatable, high Lp(a) levels inform overall risk assessment and LDL treatment targets. Triglyceride levels, influenced by diet, can be lowered through lifestyle changes.

Medication may be necessary when lifestyle changes alone are insufficient to reach target LDL levels, especially for individuals with existing cardiovascular disease or high-risk factors. Familial hypercholesterolemia, a genetic condition causing extremely high cholesterol, requires investigation and often treatment for affected family members. Despite good accessibility to testing and treatment in Israel, a gap exists between identifying abnormal results and initiating follow-up, potentially delaying necessary interventions until a critical event occurs. Experts emphasize that atherosclerosis is a gradual process and proactive management based on personal risk assessment is crucial to prevent future cardiovascular events.