What it measures
Two people can share the same LDL-C and carry different numbers of particles. More particles mean more chances for one to lodge in an artery wall. ApoB helps most when triglycerides are high, when you have metabolic syndrome or diabetes, or when LDL looks fine but risk seems higher than expected.
Who should consider it
- People with a family history of early heart disease
- Anyone with diabetes, prediabetes, high triglycerides, or metabolic syndrome
- People whose LDL looks normal but who want a closer risk read
- Anyone on cholesterol treatment who wants a second marker of progress
How to read your result
The 2018 ACC/AHA guideline calls 130 mg/dL or higher a risk-enhancing factor. Targets for people at high risk are lower and personal. Lab ranges differ.
- 130 mg/dL or higher is considered risk-enhancing in US guidance.
- Treatment goals for people who already have heart disease are much lower than for the general population.
- ApoB and LDL-C usually move together. A big gap between them is the reason to test.
Reference ranges differ between labs. Use the range printed on your own report.
When to get care right away. Chest pain or pressure, shortness of breath, fainting, or sudden weakness on one side: call 911. A blood test cannot rule out a heart attack.
What to do next
High ApoB is a reason to review lifestyle, blood pressure, blood sugar, and treatment options with a clinician. A single result is a starting point.
Where to order ApoB
These sellers include an independent physician order. You pay online and visit a partner lab. Availability, price, and lab network vary, so confirm at checkout.
Private MD Labs
Online lab seller- Says 4,500+ Quest and Labcorp locations
- Every order reviewed by a physician. Says you pay $1 to start and the rest after results.
- Secure online portal with plain-English explanations. Says many results arrive overnight.
HealthLabs
Online lab seller- Says 4,500+ labs, including Quest and Labcorp
- Online or by phone. No doctor referral or insurance needed.
- Secure HealthLabs account. Says 1 to 3 business days.
Walk-In Lab
Online lab seller- Lab network not named on its homepage
- Online, no insurance or doctor order needed. Shows a $6 physician fee per order on popular tests.
- Online account. Turnaround not stated on its homepage.
Quest Health
Lab-run- Quest, 2,000+ locations
- Buy online and book a Quest appointment. An independent provider is involved.
- Online as soon as ready, with an email alert. Provider discussion included at no extra cost.
Seller details come from each seller's own site and can change. Confirm price, lab location, and state availability at checkout.
Questions people ask
Is ApoB better than LDL?
It answers a different question. LDL-C tells you how much cholesterol rides in LDL particles. ApoB tells you how many particles carry it. When they disagree, many cardiologists trust particle number more.
Do I need to fast for ApoB?
Usually no. ApoB changes very little after a meal. Follow your lab order if it says otherwise.
Can I order ApoB without a doctor?
Yes. Several online sellers offer it with an independent physician order, then you give a sample at a partner lab.
Related guides
Lipid panel
Total cholesterol, LDL, HDL, and triglycerides in one draw.
ReadLipoprotein(a)
An inherited risk factor most people have never been tested for.
ReadHeart health panel
The blood tests that give the clearest read on cardiovascular risk.
ReadWe may earn a commission if you buy through links on this page, at no extra cost to you. This page is education, not medical advice. How we make money.