Apolipoprotein B (ApoB)

Pick Ordered or Not ordered to see the note.

Indicated when

• —Fasting or non-fasting triglycerides greater than 1.5 mmol/L, where ApoB (or non-HDL-C) is the preferred lipid parameter for cardiovascular risk screening rather than LDL-C [1]
• —Diabetes, obesity, or metabolic syndrome, where triglyceride-driven changes can make LDL-C an unreliable estimate of atherogenic particle number [1]
• —Cardiovascular risk assessment that is discordant with the standard lipid panel, where a direct measure of atherogenic particle number can help guide treatment decisions [1]

Not indicated when

• —Routine lipid screening in a patient with triglycerides at or below 1.5 mmol/L and no diabetes, obesity, or discordant risk, where standard LDL-C-based screening remains the 2021 CCS guideline default [1]
• —Repeat testing at a frequency not backed by evidence once cardiovascular risk and treatment targets are already established [6]

Why not

For most patients without elevated triglycerides, diabetes, or obesity, ApoB adds cost without changing management over a standard LDL-C-based lipid panel, and re-testing more often than the evidence supports adds cost without added clinical value [6].

Better first step

Standard fasting or non-fasting lipid panel (total cholesterol, LDL-C, HDL-C, triglycerides). Add ApoB, or use non-HDL-C which needs no extra blood draw, when triglycerides are above 1.5 mmol/L, diabetes or obesity is present, or the LDL-C-based risk estimate is discordant with the patient's overall clinical risk [1].

Typical ND rationale

An ND may recommend ApoB as a more accurate marker of cardiovascular risk than LDL-C, reasoning that it directly counts the number of atherogenic, cholesterol-carrying particles rather than estimating the amount of cholesterol they contain, and that this distinction matters most when triglycerides are high or metabolic risk factors are present.

Ontario coverage & CONO orderability

OHIP status

insured

Listed by name in the 2026 Schedule of Benefits for Laboratory Services (L042 Apolipoprotein B, fee $18.00), newly added effective April 1, 2026 "as per the 2021 Canadian Cardiovascular Society (CCS) Guidelines." Insured when ordered by a physician, midwife, or NP who has clinically assessed the patient; the same test ordered by a naturopathic doctor is not an insured service and is billed privately, regardless of this listing (Reg. 552 s.22(1); SOB-LS 2026 preamble). Apolipoprotein A1 and the calculated ApoB:ApoA1 ratio were not found under any code in the 2026 Schedule during this session, so their OHIP status is unverified, not assumed uninsured.

CONO orderable

Yes — CONO list #24

CONO list item 24, blood: 'Apolipoprotein B.' Apolipoprotein A1 is a separate CONO item (23, blood: 'Apolipoprotein A1') and a separate analyte from ApoB; it is not itself covered by this record's verdict or coverage detail.

Linked conditions

• dyslipidemia ↗

Counselling script

“For most people with normal triglycerides, the standard cholesterol panel is enough to assess heart risk, but ApoB becomes the more accurate test once triglycerides are high or you have diabetes or a larger body size, because cholesterol numbers alone can understate risk in those situations. I'll check where your numbers stand today and order ApoB if any of those apply.”

Revisit if

• —New diagnosis of diabetes or metabolic syndrome
• —Triglycerides rise above 1.5 mmol/L on a standard panel
• —Cardiovascular risk assessment becomes discordant with LDL-C
• —New family history of premature cardiovascular disease

References

1. [1]Canadian Cardiovascular Society (2021). 2021 Canadian Cardiovascular Society Guidelines for the Management of Dyslipidemia for the Prevention of Cardiovascular Disease in Adults. linkApoB (or non-HDL-C) is the preferred lipid screening parameter over LDL-C when triglycerides are above 1.5 mmol/L
2. [2]Ontario Ministry of Health (2026). INFOBulletin 260310: Update: 2026-27 schedule of benefits for laboratory services. linkApoB (L042) newly OHIP-insured effective April 1, 2026 as per the 2021 CCS Guidelines
3. [3]Ontario Ministry of Health (2026). Ontario Health Insurance Plan: Schedule of Benefits for Laboratory Services (effective April 1, 2026). linkCommunity lab tests are insured only when ordered under the Schedule by an authorized prescriber
4. [4]Government of Ontario (e-Laws) (2026). Health Insurance Act, R.R.O. 1990, Reg. 552: General, s. 22 (insured laboratory services). linkA lab test is insured only when ordered by a physician, midwife, or NP who has clinically assessed the patient
5. [5]Ontario Ministry of Health (2026). Ontario Health Insurance Plan: Schedule of Benefits for Laboratory Services (effective April 1, 2026). linkTests ordered by anyone other than an authorized provider, including NDs, are not insured services
6. [6]Canadian Society for Medical Laboratory Science / Choosing Wisely Canada (2025). Medical Laboratory Science: Fourteen Tests and Treatments to Question. linkRepeat lab test ordering at a frequency not backed by evidence should not be routinely supported