General
Apolipoprotein B
Lab test

Apolipoprotein B

Ordered for people with cardiovascular risk factors where standard cholesterol testing may not capture the full picture — particularly those with metabolic syndrome, diabetes, or high triglycerides. Also used to set and monitor treatment targets for high-risk individuals. Fasting recommended. Results reviewed by a General Medicine clinician.

Receive actionable insights and deep analysis—not just lab values– in as little as 48 hours

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Available nationwide

What is an Apolipoprotein B Test?

The Apolipoprotein B test measures the total number of atherogenic lipoprotein particles in circulation — each carrying exactly one ApoB molecule. Because LDL cholesterol measures the amount of cholesterol in particles rather than the number of particles, ApoB provides a more direct and often more accurate assessment of cardiovascular risk, particularly in people where LDL can be misleading.

Direct particle count for cardiovascular risk

Each atherogenic particle — LDL, VLDL, IDL, and Lp(a) — carries one ApoB molecule. ApoB directly counts these particles, making it a more precise measure of atherosclerotic burden than LDL cholesterol, which can underestimate risk in people with small, dense LDL particles.

Risk detection when LDL appears normal

In people with metabolic syndrome, diabetes, or high triglycerides, LDL cholesterol can appear falsely reassuring while particle count remains high. ApoB identifies elevated cardiovascular risk in exactly these situations — catching what standard lipid panels miss.

Treatment target and monitoring

ApoB is increasingly used as a treatment target in cardiovascular risk management. Achieving a target ApoB below 80–90 mg/dL (for high-risk individuals) directly reflects the degree to which atherogenic particle burden has been reduced by therapy.

Complete insights in as little as 48 hours

1

Book your test

Instantly schedule at 2,000+ labs nationwide, at a time that works for you. Most visits take 15 minutes or less, with both walk-ins and appointments available.

2

Get results in 48 hours

Your results are delivered quickly—and reviewed by medical professionals. You’ll get clear explanations, robust health insights, and recommended next steps tailored to your health needs.

3

Take action with physician guidance

Choose to review your results and manage your plan with a General Medicine physician—or simply use the insights on your own.

4

Track progress over time

Repeat annually to see trends, improvements, and new emerging risks or book individual tests that focus on your set goals

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Your care plan
Clinician

What's included

Test type

Blood sample

Collection method

Venipuncture

Fasting

Not required

Results processing time

1 to 3 days

Apolipoprotein B

Measures ApoB levels to assess cardiovascular risk by evaluating LDL and other atherogenic lipoproteins.

Virtual visit with clinician

Ongoing support, always available.

You’ll be supported by experienced clinicians who care for a wide range of health needs, from everyday concerns to more complex conditions.

Our clinicians track your progress over time and adjust your care as needed. If medication is prescribed, we’ll manage dosing and monitor for side effects. If lab testing is recommended, we review results and refine your plan accordingly. You’re never left to navigate care on your own.

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Frequently asked questions

What is Apolipoprotein B and why does it matter?

Apolipoprotein B (ApoB) is the main protein on all atherogenic (artery-clogging) lipoprotein particles — including LDL, VLDL, and IDL. Each particle carries exactly one ApoB molecule, making ApoB the most direct measure of the number of potentially harmful cholesterol particles in circulation.

How is ApoB different from LDL cholesterol?

LDL cholesterol measures the amount of cholesterol in LDL particles — not the number of particles. ApoB counts the particles directly. Studies show ApoB is a stronger predictor of cardiovascular risk than LDL cholesterol, particularly in people with metabolic syndrome, diabetes, or high triglycerides.

Do I need to fast before an ApoB test?

Fasting is generally recommended for 9–12 hours for the most accurate ApoB result, particularly if triglycerides are also being measured. Fasting removes the confounding effect of recent fat intake on lipoprotein levels.

Who should consider getting ApoB tested?

People with a strong family or personal history of cardiovascular disease, those with metabolic syndrome, diabetes, or elevated triglycerides, and anyone whose LDL appears 'normal' but who has other cardiovascular risk factors would benefit most from ApoB measurement to get a clearer risk picture.

What ApoB level is considered elevated?

An ApoB above 130 mg/dL is generally considered elevated and associated with increased cardiovascular risk. Optimal targets — especially for high-risk individuals — are often below 80–90 mg/dL. Treatment targets using ApoB are increasingly incorporated into lipid management guidelines.