$10.00
Priced per marker, with baseline labs included. You’ll see your total before you pay.
Heart & circulation
ApoB test
Apolipoprotein B. Protein on every atherogenic ('bad') particle (LDL, VLDL, Lp(a)); can be more predictive of cardiac risk than LDL-C.
At a glance
In about 5 days
Most results are ready in about 5 days. Some specialty markers can take up to 21 days.
Check before your draw
This marker has no preparation tag, but it can still need preparation. Contact us before your draw if you’re not sure.
Walk in at Quest
Your lab order arrives by email. Most Quest locations take walk-ins, so bring it with a photo ID.
What it measures
Each particle that can carry cholesterol into your artery walls has a single ApoB protein on it. Counting ApoB can show how many of these particles are in your blood.
Why it matters for women
Heart disease is the leading cause of death in women, and the particles ApoB counts can climb around menopause. ApoB can show risk more clearly than LDL alone, especially when triglycerides, a type of blood fat, run high.
You might check it if…
- heart disease or stroke runs in your family
- your triglycerides or blood sugar run high
- you’re in perimenopause or past menopause
- your LDL looks fine but you want a closer look
What your result may mean
High ApoB: what it may mean
High ApoB may mean you have more cholesterol-carrying particles in your blood, which can raise the chance of plaque, heart attack and stroke. It may be a stronger predictor of heart risk than LDL alone, because each particle that can clog arteries carries one ApoB protein. Inherited high cholesterol, insulin resistance, PCOS and an underactive thyroid (hypothyroidism) can raise it, and levels can climb around menopause. You may feel fine, since high ApoB can cause no symptoms for years.
Low ApoB: what it may mean
Low ApoB may mean there are fewer artery-clogging particles in your blood, which can be a favorable sign for your heart. It can happen with cholesterol-lowering medicines, an overactive thyroid (hyperthyroidism), poor nutrition, severe liver disease or a rare inherited condition called hypobetalipoproteinemia. A low result may not be a concern on its own, especially if you take a cholesterol medicine. Blood pressure, smoking and blood sugar can still matter for heart risk.
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These notes provide context and do not diagnose a condition. Not yet available in NY, NJ, RI, HI, ND, SD or WV.