Written by &you Labs Team
Updated October 11, 2026
Coronary artery disease, or CAD, is plaque buildup inside your heart arteries. It is the top cause of heart attacks worldwide. CAD builds up slowly, over decades. It leaves clues in your blood years before a heart attack happens.
This guide covers the blood tests that catch those clues early. You still have time to act on them.
Your CAD risk is best shown by six things: ApoB, LDL cholesterol, lipoprotein(a), hs-CRP, blood pressure, and blood sugar markers like HbA1c. Family history matters too. ApoB is the single most accurate blood marker. It counts every harmful particle that can get stuck in your artery walls. Lipoprotein(a) adds your genetic risk. hs-CRP adds your inflammation risk. A full picture uses all of these together.
CAD develops in slow stages over many years.
Stage 1: Damage begins. High LDL and ApoB, smoking, and high blood pressure damage your artery walls.
Stage 2: Particles get trapped. LDL particles slip inside the artery wall. They get damaged there. Your immune system reacts to them.
Stage 3: Plaque forms. Immune cells eat the damaged LDL. They turn into what doctors call foam cells. This buildup starts to form plaque.
Stage 4: Plaque grows. Plaque keeps building over years. Some stays stable. Some grows a thin, fragile cap.
Stage 5: A plaque tears open. A fragile plaque can tear. Your body forms a clot right there. If the clot blocks the artery, a heart attack happens.
Each blood marker below tells you something about one of these stages.
Marker | What it measures | Healthy target |
|---|---|---|
ApoB | Count of harmful cholesterol particles | Under 90 mg/dL, lower with other risk factors |
LDL cholesterol | The classic "bad" cholesterol marker | Under 100 mg/dL, lower with other risk factors |
Lipoprotein(a) | A genetic, inherited cholesterol particle | Test once in your life; about 1 in 5 adults run high |
hs-CRP | Ongoing, low-grade inflammation | Under 1 mg/L |
HDL cholesterol | Helps carry cholesterol away from arteries | Above 60 mg/dL |
Triglycerides | A fat that reflects your metabolic health | Under 100 mg/dL |
Homocysteine | Reflects blood vessel and vitamin B status | Under 8 micromol/L |
Think of ApoB as counting delivery trucks. LDL just counts the boxes inside them. Every harmful particle carries one ApoB tag. It carries this tag no matter how much cholesterol is inside. Counting the trucks tells you more about your real risk. This is most true if you also carry extra weight around your middle.
HbA1c and fasting insulin reveal diabetes and pre diabetes. Both raise your heart disease risk. A healthy HbA1c target is under 5.4%. A healthy fasting insulin target is under 8 microunits per mL.
Blood pressure is not a lab value. Still, it belongs in this picture. A healthy target is under 120/80 mmHg.
A parent or sibling with an early heart attack raises your risk. This means before age 55 for men, or before age 65 for women. Blood markers alone may not show this risk.
Doctors often use a calculator for this. It combines your age, sex, blood pressure, and cholesterol. It also uses your diabetes status and smoking history. It estimates your heart attack risk over the next 10 years.
Some regional heart groups use versions built for Asian populations. Risk tends to show up earlier here. It can appear at a lower body weight too.
These calculators are a useful starting point. They skip lipoprotein(a) and imaging. Your doctor may add those tests where they fit.
Blood tests show your risk. Imaging can show if disease has already started.
A coronary calcium score is a low-dose CT scan. It measures hardened plaque in your heart arteries. A score of zero means very low risk. Higher scores mean higher risk.
Carotid ultrasound and CT angiography are used less often. Doctors save these for specific situations, not routine screening.
For most adults, a strong blood panel is the practical first step. Your doctor may add a calcium score on top of that.
A "normal" cholesterol panel with hidden risk. LDL looks fine. ApoB is high. This often means many small, dense LDL particles, which are more dangerous. It often shows up with insulin resistance too.
Genetic risk on top of everything else. Lipoprotein(a) is high. A parent had an early heart attack. Total risk is higher here, even with otherwise normal numbers.
Metabolic syndrome cluster. High triglycerides, low HDL, high fasting insulin, and borderline HbA1c often travel together. Lifestyle change is the first step.
High inflammation despite good cholesterol. hs-CRP stays high, but LDL and ApoB look fine. Poor sleep, extra weight, or gum disease are worth checking.
Lifestyle changes make the biggest difference for most people.
Medicine helps when lifestyle change is not enough. Statins, a common group of cholesterol pills, lower LDL and ApoB. Blood pressure medicine treats high blood pressure. Diabetes medicine treats high blood sugar. Your doctor decides what fits your case.
Lifestyle changes can shift your numbers within 8 to 12 weeks. Statins show their full effect within 4 to 8 weeks. Your real risk keeps dropping the longer you keep the changes going.
Filipinos tend to develop CAD at a younger age. This often happens at a lower body weight too, compared with Western groups. That is why doctors often start careful screening in your late 30s. Diets heavy in white rice and sweet drinks add extra risk. Long hours of sitting at work add even more, on top of genetics.
Talk to a cardiologist if any of these apply to you.
See the full &you Labs biomarker list to check exactly which heart markers are included in your panel. Ready to see your own numbers? Book a &you Labs panel.
No single test can promise that. But ApoB, LDL, hs-CRP, lipoprotein(a), and blood sugar markers together give a strong, well-tested estimate of your risk over time.
For people at moderate risk, a calcium score often helps with treatment decisions. Talk to your doctor about whether it fits your case.
It is still worth testing lipoprotein(a) once. It is genetic, so normal cholesterol will not reveal it. Family history matters too. Most 30-year-olds with normal numbers have low near-term risk.
Yes. Decades of research back this up. Lowering LDL, ApoB, blood pressure, and blood sugar cuts the risk of heart attacks and strokes.
Once a year is reasonable for most adults. Every six months if you are actively managing a risk factor. Lipoprotein(a) only needs testing once in your life.
The &you Labs Team combines medical science with personal care. We help Filipinos understand their health markers with blood work analysis that is easy to follow, whole person support, and health expertise built for Filipino life.
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