Test library
Apo B Blood Test
The Apolipoprotein B (Apo-B) Test measures the number of atherogenic particles in the blood. It is used as a cardiovascular risk marker and adds information beyond standard cholesterol measures.
Order Apolipoprotein B Test, (Apo-B)
Order online and visit a local collection site, or choose an at-home kit where available. No referral and no insurance required.
Order Apolipoprotein B Test, (Apo-B)- Typical turnaround
- 1-3 business days
- Starting price
- From $118
- Results
- Confidential, online
Quick answer
The Apolipoprotein B (Apo-B) Test measures the amount of apolipoprotein B in the blood. Each atherogenic particle, including LDL, VLDL, and remnant particles, carries one molecule of Apo-B, so the level reflects the number of particles that can contribute to plaque buildup. It is used as a cardiovascular risk marker, especially when triglycerides are elevated or metabolic conditions such as diabetes are present. A qualified healthcare provider interprets the result with other lipid measures.
What this test measures
Apolipoprotein B is the main protein on LDL and other particles that can deposit cholesterol in artery walls. Because each of these particles carries one Apo-B molecule, measuring Apo-B gives an estimate of particle number. This can differ from LDL cholesterol, which measures the amount of cholesterol carried rather than the number of particles.
Apo-B may be ordered when standard lipid results leave risk unclear, when triglycerides are high, or when diabetes and metabolic syndrome increase cardiovascular risk. Some guidelines consider Apo-B a useful marker for monitoring response to treatment. The sample is a blood draw, and fasting may or may not be required depending on the laboratory.
The result is interpreted alongside total cholesterol, HDL, LDL, triglycerides, and other risk factors such as blood pressure and smoking status. No single marker captures all cardiovascular risk. A qualified healthcare provider can explain what the Apo-B value adds in your situation and whether follow-up is needed.
- Apolipoprotein B (Apo-B)
- Apo-B level in blood
- Reference range comparison
- Particle number estimate
- Relationship to LDL cholesterol
- Relationship to triglycerides
Why people order this test
- Assess cardiovascular risk beyond standard cholesterol tests
- Evaluate risk when triglycerides or metabolic markers are elevated
- Support monitoring of lipid-lowering treatment
- Add particle information when LDL results are inconclusive
- Follow up on a family history of early heart disease
How to prepare
Fasting requirements vary, so follow the instructions provided with your order. Some laboratories prefer a fasting sample, especially if triglycerides are also being measured. A blood sample is drawn from a vein.
Understanding your results
Results are typically available within one to three business days. The report lists the Apo-B value with the laboratory's reference range. Because risk depends on the full lipid profile and other factors, a qualified healthcare provider should interpret the number rather than comparing it with a single cutoff.
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Frequently Asked Questions
What does the Apo-B test measure?
It measures apolipoprotein B, the protein found on LDL and other particles that can contribute to artery plaque, reflecting particle number.
How is Apo-B different from LDL cholesterol?
LDL cholesterol measures the cholesterol carried in LDL, while Apo-B reflects the number of atherogenic particles, which can provide additional risk information.
Do I need to fast?
It depends on the laboratory and whether other tests are included. Follow the preparation instructions with your order.
Who should consider Apo-B testing?
It may be useful for people with elevated triglycerides, diabetes, metabolic syndrome, or a family history of early heart disease.
Can Apo-B alone determine my heart risk?
No. It is one marker among many, and a clinician interprets it with your full lipid profile and other risk factors.
Ready to get tested?
Order online and visit a collection site near you, or choose a mail-in kit. No referral and no insurance required.
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