Understanding Heart Health testing
Cardiovascular disease remains the leading cause of death globally, responsible for approximately one third of all deaths each year. The vast majority of cardiac events — heart attacks and strokes — occur not because of sudden onset disease but because of atherosclerosis that has been silently progressing for decades. Arterial plaque begins accumulating in early adulthood and is substantially influenced by lipid levels, inflammation, metabolic status, and blood pressure throughout life.
A standard lipid panel measuring total cholesterol, LDL, HDL, and triglycerides provides an incomplete picture. Advanced cardiovascular markers — including ApoB, Lp(a), hs-CRP, and homocysteine — dramatically improve risk stratification and can identify high-risk individuals who would otherwise be missed. Studies consistently demonstrate that people with normal LDL-C but elevated ApoB or Lp(a) carry a significantly elevated cardiovascular event risk that targeted intervention can meaningfully reduce.
How Heart connects across the body
Heart health does not exist in isolation — it is deeply intertwined with every major system.
Liver & Lipid Metabolism
The liver is the central hub of lipid metabolism, producing VLDL particles that are remodelled into LDL, synthesising HDL precursors, and expressing LDL receptors that clear atherogenic particles from circulation. Insulin resistance reduces hepatic LDL receptor expression, allowing LDL to accumulate. The liver also produces ApoB — one molecule per atherogenic lipoprotein particle — making ApoB a direct count of cardiovascular risk particles. Statins lower cardiovascular risk primarily by upregulating hepatic LDL receptor expression.
Immune System & Inflammation
Atherosclerosis is fundamentally an inflammatory disease. Oxidised LDL particles trigger endothelial activation, recruiting monocytes that differentiate into macrophages within the arterial wall. These macrophages engulf lipid and become foam cells — the building blocks of atherosclerotic plaque. hs-CRP reflects systemic inflammation driven by IL-6 from macrophages and adipose tissue, predicting plaque instability and rupture risk independently of lipid levels. Omega-3 fatty acids, statins, and lifestyle change all reduce cardiovascular risk partly through anti-inflammatory mechanisms.
Endocrine System & Metabolic Health
Insulin resistance elevates triglycerides (by reducing lipoprotein lipase activity and increasing hepatic VLDL secretion), reduces HDL (by accelerating HDL catabolism), and produces the small, dense LDL particles that are most atherogenic. Diabetes doubles cardiovascular risk. Thyroid hormones regulate LDL receptor expression — hypothyroidism elevates LDL-C and Lp(a) and should always be excluded in people with hyperlipidaemia. Sex hormones influence cardiovascular risk: testosterone in physiological ranges supports vascular health; oestrogen maintains endothelial function and explains the lower pre-menopausal cardiovascular risk in women.
Kidney Function
Chronic kidney disease is an independent and powerful risk factor for cardiovascular disease, approximately doubling cardiac event risk even at modest stages of kidney function decline. This relationship is bidirectional: hypertension and atherosclerosis cause kidney damage, and kidney disease drives fluid retention, uraemic toxin accumulation, and anaemia that stress the heart. Homocysteine, which damages endothelium and promotes clot formation, is cleared by the kidneys — CKD elevates homocysteine and accelerates cardiovascular risk.
Supporting Heart health
Nutrition
- Replace saturated fat with mono- and polyunsaturated fats (olive oil, avocado, nuts) to reduce LDL-C without lowering HDL.
- Eat fatty fish (salmon, sardines, mackerel) 2–3 times per week or supplement EPA+DHA omega-3s at 2–4g/day to lower triglycerides and reduce cardiovascular inflammation.
- Increase soluble fibre from oats, legumes, and psyllium — 10g of soluble fibre per day reduces LDL-C by 5–7% through bile acid sequestration.
- Reduce refined carbohydrates and sugars, the primary dietary drivers of elevated triglycerides, small dense LDL, and low HDL.
Exercise
- Aerobic exercise at moderate intensity for 150 minutes per week reduces triglycerides by 20–30%, raises HDL, and lowers blood pressure — one of the most effective lifestyle interventions for cardiovascular risk.
- Resistance training complements aerobic exercise by improving insulin sensitivity, reducing visceral fat, and lowering resting blood pressure.
- Avoid prolonged sedentary periods — even light physical activity breaks throughout the day independently reduce cardiovascular mortality in cohort studies.
Other Key Factors
- Smoking cessation reduces cardiovascular risk rapidly — within one year of quitting, excess coronary heart disease risk falls by 50%.
- Manage blood pressure below 130/80 mmHg through dietary sodium reduction, weight management, exercise, and medication where indicated.
- Adequate sleep (7–9 hours) is associated with lower hs-CRP, lower blood pressure, and reduced risk of atrial fibrillation.
Clinical note
Cardiovascular risk should be assessed as an integrated score, not based on any single biomarker. Tools like the ACC/AHA Pooled Cohort Equations, combined with ApoB, Lp(a), and hs-CRP, provide the most clinically actionable risk stratification. Always discuss results with a qualified clinician before initiating or modifying lipid-lowering therapy.
