"Cholesterol is only a part of the equation": Doctor reveals hidden dangers and the plot hole no one notices

Think having “perfect” cholesterol numbers automatically means your heart is in tip-top shape? Well, that’s a common misconception most of us fall for. You might be rocking textbook HDL and LDL levels, feeling proud, sipping your green smoothie, and assuming your arteries are sparkling clean. But here’s the kicker — cholesterol is only one piece of the puzzle. There’s a whole hidden world of risk factors quietly influencing your heart health, and most standard blood tests just don’t catch them.

We at TOI spoke to Dr. Abhinav Sharma, Senior Consultant in Cardiothoracic & Vascular Surgery at Yatharth Super Speciality Hospital, Faridabad, to pull back the curtain. From ApoB and LDL particle count to Lp(a), homocysteine, inflammatory markers, and insulin resistance, these hidden signals can reveal risks lurking under the surface — sometimes even when your cholesterol report looks flawless, says the expert.

Can someone have textbook-perfect LDL and HDL levels and still be at risk for heart disease? If yes, what hidden factors should people be looking at?

It is possible for people to have healthy HDL and LDL levels and still be at risk for heart disease. Cholesterol is only part of the equation. Many hidden factors show up when looking at ApoB, LDL particle number, Lp(a), inflammatory markers (hs-CRP), insulin resistance, borderline hypertension, family history, and measuring coronary calcium score often show risks that often go unstated in a baseline report from cholesterol testing. Heart health needs to be viewed with the 360-degree view, not just HDL and LDL.

Many patients assume “normal cholesterol” means “zero risk.” What’s the biggest misconception you see in your clinic about cholesterol numbers?

The largest misunderstanding is that if cholesterol is normal, there is zero risk. Taking great care of your arteries is far more complex than just high and low. Other markers like ApoB, Lp(a), inflammatory markers, insulin resistance, borderline hypertension, and history often tell the story. A concern with patients is they become relaxed with healthy cholesterol, when that can lead to risks missed. Cholesterol is just one chapter, not the book. Deeper testing is important.

Many patients with normal lipid profiles still develop plaque. What does this reveal about the limitations of traditional cholesterol testing?

The phenomenon of people having normal cholesterol and still developing plaque illustrates the limits of simple lipid testing. A standard panel looks at what is floating in the blood, but not what is directly taking place under the walls of artery walls. They may also miss ApoB, Lp(a), inflammation, insulin resistance, and genetic risks that lead to plaque formation below the surface. Normal cholesterol does not mean normal arteries. To uncover hidden risks, testing needs to be deeper and more advanced.

Lp(a) has been called “the silent wildcard.” How often do you test it, and why is it overlooked in standard blood tests?

Lp(a) is called the silent wildcard, since it raises the risk for heart disease when cholesterol looks perfect. Patients miss this opportunity because it does not show up on the routine cholesterol test and requires a separate request. Because Lp(a) is genetic and does not change, testing for it once in a lifetime is very valuable, if not essential. I test for it in most patients with unexpected plaque since high Lp(a) can rationalize plaque or abnormal cholesterol/biomarkers. It is useful to identify someone who needs additional monitoring.

Homocysteine is rarely discussed in mainstream health. How does an elevated level influence cardiovascular health? What should people know about it?

High homocysteine levels are seldom discussed, but these levels can slowly compromise arteries in the absence of high cholesterol. High levels of homocysteine create irritation in the lining of arteries, are linked to increased clotting potential, speed up atheroma (plaque) growth, and increase damage from elevated blood pressure, diabetes, tobacco use, or elevated Lp(a) levels. They aren't part of routine testing and can be asymptomatic, so in practice they are ignored. The exciting news is they are correlated with B-vitamin deficiency, so can we improved with well-designed interventions.

If you could change one thing about how the general public interprets cholesterol results, what would it be?

It would be how people interpret normal cholesterol levels. A routine lab report does not show the burden of ApoB particles, inherited risks from a recognized Lp(a) disorder, inflammatory potential, insulin resistance, or even already existing plaque in the arteries. Patients feel safe from normal LDL and normal HDL, and they do not take tests like C-reactive protein or insulin resistance even further until the next abnormality appears. But heart health is about the condition of the arteries (and the overall cardiovascular system), not just plain old numbers on paper. Cholesterol would be the beginning of the beginning of the beginning, but is never the ending.