Heart attack risk is not just about cholesterol: 7 warning factors doctors check that routine tests can miss

A cholesterol report often becomes a quick verdict on heart health. If the numbers look acceptable, many people assume the heart is safe. But heart-attack risk is not controlled by one number.

“A normal cholesterol report is often seen as reassurance that the heart is healthy. While cholesterol remains an important cardiovascular risk factor, it does not provide a complete picture of an individual's risk of heart attack. Cardiovascular disease develops through a combination of genetic, metabolic, lifestyle and vascular factors, many of which may not be captured by a routine lipid profile,” said Dr Ajeet Bana, Chairman, Cardiac Sciences, EHCC Hospital, Jaipur.

The bigger question is what else may be quietly affecting the arteries.

A person can have reasonable cholesterol levels and still have poorly controlled blood pressure or diabetes.

High blood pressure puts continuous stress on artery walls. High blood sugar can damage blood vessels over time. Abdominal obesity, low physical activity and tobacco use add further pressure to the cardiovascular system.

That is why doctors look at the whole metabolic picture rather than simply asking, “What is the cholesterol?”

Sleep and long-term lifestyle habits also deserve attention. A sedentary routine, poor sleep and tobacco exposure can keep cardiovascular risk elevated even when a blood report looks reassuring.

Family history can change the picture too. A parent or sibling who had a heart attack at a relatively young age may signal an inherited vulnerability that deserves a closer assessment.

One lesser-known marker is lipoprotein(a), or Lp(a). Lp(a) is largely determined by genetics and is not usually part of a standard lipid profile. High levels are linked with higher risk of atherosclerotic cardiovascular disease.

The 2026 ACC/AHA dyslipidemia guideline recommends measuring Lp(a) at least once in adulthood. It also notes that higher levels can substantially increase long-term cardiovascular risk.

“This is particularly relevant in India, as South Asian populations tend to have higher Lp(a) levels,” Dr Bana said.

Another marker is Apolipoprotein B, or ApoB. LDL cholesterol tells doctors how much cholesterol is carried inside LDL particles. ApoB gives information about the number of atherogenic particles themselves.

This can be particularly useful in people with diabetes, high triglycerides or other metabolic problems, where LDL alone may not tell the entire story.

Blood tests measure risk factors. They do not directly show whether plaque has already built up inside the coronary arteries.

That is where coronary artery calcium, or CAC, scoring can sometimes help. It uses a CT scan to look for calcified plaque in the heart's arteries.

It is not a test everyone needs. Doctors may consider it when a person's cardiovascular risk is uncertain and the result could help guide preventive treatment. The US National Heart, Lung, and Blood Institute notes that CAC scoring can improve risk assessment in selected people.

A zero score can be reassuring in the appropriate setting, but it does not mean that every possible heart problem has been ruled out.

Perhaps the most important point is also the simplest. A normal cholesterol report should never be used to dismiss new symptoms.

Unexplained chest discomfort, breathlessness, reduced exercise tolerance, unusual fatigue or recurrent palpitations deserve medical attention, especially when other risk factors are present.

“The objective of preventive cardiology is not to order every available test. It is to identify the right risk factors in the right individual and intervene early,” Dr Bana said.

That is the real shift in thinking. Heart health is not a report card with one number at the top. It is a combination of blood pressure, blood sugar, body composition, habits, family history, inherited risk and, when appropriate, evidence of plaque.

This article includes expert inputs shared with TOI Health by:

Dr Ajeet Bana, Chairman Cardiac Sciences, EHCC Hospital, Jaipur.

Inputs were used to explain why looking beyond cholesterol is essential for assessing heart-attack risk and why a broader cardiac evaluation may be needed even when routine tests appear normal