Apolipoprotein B (ApoB) Test in Singapore

Apolipoprotein B (ApoB) is a protein on the surface of every artery-clogging (atherogenic) cholesterol particle — LDL, VLDL, IDL and lipoprotein(a). Each particle carries exactly one ApoB, so measuring ApoB effectively counts the total number of harmful particles in your blood. Because it is the number of particles, not just the amount of cholesterol they carry, that drives build-up in artery walls, ApoB is a direct and often more accurate measure of cardiovascular risk than LDL cholesterol alone.

A standard LDL cholesterol (LDL-C) reading tells you how much cholesterol your LDL particles carry, and it is usually calculated rather than measured directly. ApoB is measured directly and tells you how many atherogenic particles there are. These do not always agree: two people with the same LDL-C can have very different particle numbers. Where they disagree — called discordance — the particle number (ApoB) tracks cardiovascular risk more closely. ApoB does not replace the lipid panel; it adds precision to it.

No. ApoB does not require fasting and can be taken at any time of day — it is a single blood draw. This is a practical advantage over the calculated LDL cholesterol in a traditional fasting lipid panel: ApoB stays reliable whether or not you have eaten. If it is done alongside other tests that need fasting, your doctor will let you know.

ApoB is reported in mg/dL (or g/L, where 100 mg/dL equals 1.0 g/L). As a general guide, below about 90 mg/dL (0.9 g/L) is optimal, 90 to 100 mg/dL is desirable, 100 to 130 mg/dL is borderline, and above about 130 mg/dL (1.3 g/L) is elevated and linked to higher cardiovascular risk. Targets are individualised by risk: people at high risk (established heart disease or diabetes) usually aim below 80 mg/dL (0.8 g/L), and those at very high risk may aim below 65 mg/dL (0.65 g/L). Your doctor interprets the number against your overall risk.

Yes, and this is exactly why ApoB is useful. It happens most often in people with diabetes, metabolic syndrome or high triglycerides, who tend to carry a large number of small, cholesterol-poor LDL particles. Their LDL cholesterol can look at goal while their ApoB — the particle count — stays high, meaning a standard panel underestimates their true risk. Measuring ApoB uncovers this hidden risk so it can be managed.

ApoB is worth considering if you have diabetes, metabolic syndrome or high triglycerides (where LDL cholesterol can be misleading), a personal or family history of early heart disease or stroke, familial hypercholesterolaemia, heart disease that progresses despite an acceptable LDL, or if you want to track how well cholesterol-lowering treatment is working. In Singapore, the Ministry of Health lists apolipoprotein B as a screening test that may be useful for individuals at intermediate coronary heart disease risk. If you are unsure whether it applies to you, WhatsApp us and we will advise.

Because ApoB reflects your atherogenic particles, the measures that lower LDL cholesterol also lower ApoB: a diet lower in saturated fat and refined carbohydrates and richer in fibre, vegetables and healthy fats; regular physical activity; losing excess weight; and stopping smoking. Where cardiovascular risk warrants it, statin therapy lowers both LDL cholesterol and ApoB and may be considered by your doctor. ApoB is also a useful way to confirm that treatment is genuinely reducing your particle number.

Yes. Because ApoB is measured directly and counts particles, it is a reliable way to check that lipid-lowering treatment is actually reducing your atherogenic burden — not just your calculated LDL cholesterol. It is particularly helpful in people with diabetes or high triglycerides, where LDL cholesterol alone can give false reassurance. Your doctor may use it alongside your lipid panel to fine-tune treatment.

At our clinics the Apolipoprotein B (ApoB) test is $32.70 NETT, inclusive of GST. A doctor consultation (from $49.05 NETT) may be required for a specifically requested test, so your doctor can confirm it is appropriate and interpret your result; this is waived if you have a referral or when ApoB is part of a cardiac screening. ApoB is included in our Cardiac Screening 3 and 4 panels, which can be more cost-effective for a fuller cardiovascular picture. See the full pricing table above or WhatsApp 8095 3275 to confirm current rates.