Lab test
What is an ApoB test, and what ApoB level is desirable?
An ApoB test measures apolipoprotein B, the main protein on LDL and related cholesterol-carrying particles, as a marker of heart disease risk. ARUP Laboratories describes under 90 mg/dL as desirable for preventing atherosclerotic disease in adults, and 130 mg/dL or more as a risk-enhancing factor. Labcorp grades 100 to 130 mg/dL as high.
What does the ApoB test measure?
Apolipoprotein B is the protein found in low density lipoprotein (LDL). ARUP Laboratories
Labcorp describes ApoB as possibly important in the development of atherosclerosis, and its measurement as useful in evaluating people at risk for coronary artery disease. Labcorp
Why is the ApoB test ordered?
- To evaluate people at risk for, or with, coronary atherosclerosis; high levels indicate increased risk. Labcorp
- As a risk-enhancing factor for atherosclerotic cardiovascular disease when it is 130 mg/dL or higher. ARUP Laboratories
What are typical ApoB ranges?
ARUP and Labcorp publish ApoB as risk categories rather than a single normal range. Labcorp
Reference ranges differ between laboratories and testing methods, and many also differ by age, sex, pregnancy or the phase of the menstrual cycle. The range printed on your own report is the one that applies to your result, and a clinician interprets it alongside your history.
| Category | ApoB |
|---|---|
| Desirable | Less than 90 mg/dL |
| Borderline high | 90 to 99 mg/dL |
| High | 100 to 130 mg/dL |
| Very high | More than 130 mg/dL |
ARUP Laboratories describes a serum ApoB under 90 mg/dL as desirable for prevention in adults, and 130 mg/dL or greater as corresponding to an LDL above 160 mg/dL and a risk-enhancing factor. ARUP Laboratories
What can affect ApoB results?
- ARUP requires a fasting specimen for its ApoB test; ask whether your lab does too. ARUP Laboratories
- Labcorp sets lower therapeutic targets for people already in high-risk categories, so a "desirable" level depends on who is being tested. Labcorp
When should you talk to a clinician about a ApoB result?
- ApoB is interpreted with your lipid panel and overall cardiovascular risk; ask the clinician who ordered it how it changes your picture. Labcorp
DiscoverMedica explains what a test measures and what named sources publish. It does not interpret individual results; the clinician who ordered your test, or one you choose, does.
Where can you get a ApoB test?
A clinician can order it as part of routine or follow-up care. Some services also let you order lab tests yourself; check that a service’s panel includes this marker, which laboratory runs it, and who reviews the result with you.
- Function HealthAnnual membership for broad lab panels, drawn at Quest sites or at home.
- Quest HealthOrder individual lab tests from Quest Diagnostics online, without a doctor’s visit.
ApoB Test: questions, answered
What is a good ApoB level?
Labcorp lists under 90 mg/dL as desirable, 90 to 99 as borderline high, 100 to 130 as high and above 130 as very high. ARUP Laboratories likewise describes under 90 mg/dL as desirable for prevention in adults. Targets can be lower for people at very high risk, as set by a clinician.
Is ApoB better than LDL cholesterol?
They measure different things: LDL cholesterol is the cholesterol carried in particles, ApoB is the main protein on those particles. Labs describe ApoB as useful for evaluating coronary risk, and ARUP links an ApoB of 130 mg/dL or more to an LDL above 160 mg/dL. Which tests you need is a clinician’s call.
Do I need to fast for an ApoB test?
ARUP Laboratories lists a fasting specimen as a requirement for its ApoB test. Other labs may differ, so ask whoever orders it. If a lipid panel is drawn at the same visit, MedlinePlus notes that a cholesterol test may also call for a 9 to 12 hour fast, so one set of instructions can cover both.
Sources
Last reviewed October 7, 2026. Every source above was checked on or before that date. Educational information only, not medical advice; it does not replace a conversation with a licensed clinician. DiscoverMedica does not employ clinicians.