NMR LipoProfile Test: What Particle Numbers Show and When It Is Worth It

An NMR LipoProfile counts lipoprotein particles and measures their size, which a standard lipid panel does not. Here is what is on the report, how it compares with ApoB, ion mobility and ultracentrifugation, and when the extra detail is useful.

Published

October 2, 2026

Read time

11 min read

Medically reviewed by

Rhonda Collins, FNP-C

Share

Copy link

An NMR LipoProfile is a blood test that counts lipoprotein particles and measures their size using nuclear magnetic resonance (NMR) spectroscopy. A standard lipid panel reports how much cholesterol those particles carry. The NMR report adds how many particles there are, mainly the LDL particle number (LDL-P), and how large they are. It is most useful when LDL cholesterol and LDL particle number may disagree. For most people, a lipid panel, and sometimes ApoB, answers the first question well enough.

What does an NMR LipoProfile measure?

An NMR LipoProfile measures lipoprotein particle number and particle size. Lipoproteins such as LDL, HDL, and VLDL are the particles that carry cholesterol and triglycerides through the blood.

A review of the NMR LipoProfile in Frontiers in Nuclear Medicine describes how the method works. The analyzer records the NMR signal from a serum or plasma sample. Each lipoprotein subclass gives off a signal with its own shape. The strength of each signal is proportional to the number of particles producing it. Software converts those signals into particle concentrations and sizes.

That is a different measurement from a lipid panel. A lipid panel measures the cholesterol mass inside lipoproteins. Because the amount of cholesterol per particle varies from person to person, the same LDL cholesterol can come with very different particle counts.

“NMR LipoProfile” is the trade name of a widely used NMR test. Product listings may call the same kind of test lipoprotein fractionation by NMR, an NMR lipid panel, or a lipoprotein particle panel.

What is on an NMR LipoProfile report?

An NMR LipoProfile report lists particle counts and sizes for the main lipoprotein classes. The exact set depends on the version ordered. Common results include:

• LDL particle number (LDL-P): the total count of LDL particles. This is the headline result.
• Small LDL particle number (small LDL-P): the count of the smaller LDL particles within LDL-P.
• LDL size: the average size of LDL particles.
• HDL particle number (HDL-P) and large HDL particles: counts of HDL particles, the particles that carry cholesterol away from tissues.
• HDL size: the average size of HDL particles.
• Large VLDL particle number and VLDL size: measures of the triglyceride-rich particles made by the liver.
• LP-IR score: an insulin resistance score included on some versions of the test.

Some orders also include a standard lipid panel on the same report: LDL cholesterol, HDL cholesterol, total cholesterol, triglycerides, and non-HDL cholesterol.

What the LP-IR score means

The LP-IR score is an insulin resistance index calculated from NMR lipoprotein results. It is not a glucose or insulin measurement. Its developers combined six lipoprotein measures into one score and built it against HOMA-IR, a standard insulin resistance estimate, in 4,972 adults without diabetes from the Multi-Ethnic Study of Atherosclerosis. In that work, LP-IR correlated with HOMA-IR more strongly (r = 0.51) than any single lipoprotein measure or the triglyceride-to-HDL ratio did (r = 0.41). A higher score points toward more insulin resistance. The score suggests a pattern. It does not diagnose insulin resistance or diabetes.

Why would a clinician order an NMR LipoProfile?

The main reason is discordance: LDL cholesterol (LDL-C) looks acceptable, but LDL particle number (LDL-P) may not be. Because cholesterol content per particle varies, LDL-C can understate how many LDL particles are present.

The Frontiers in Nuclear Medicine review summarizes the evidence:

• In a community sample, about 21% of people with low LDL-C had high LDL-P.
• In one lipid clinic, discordance was found in about 63% of patients.
• Factors linked with discordance included male sex, smoking, lipid-lowering therapy, and being close to an LDL-C target.
• In one study of people whose LDL-C and LDL-P disagreed, LDL-P was associated with incident cardiovascular disease and LDL-C was not.

The same review notes that small LDL particles are more common with insulin resistance, type 2 diabetes, high triglycerides, obesity, and high blood pressure. These are the situations where a clinician is most likely to ask whether the cholesterol number tells the whole story.

The review’s authors argue for wider use of NMR testing. Those are its authors’ conclusions. The evidence on whether NMR improves on simpler tests is mixed, as the limitations section below explains.

NMR LipoProfile vs a standard lipid panel

A standard lipid panel and an NMR LipoProfile measure different things.

The 2026 ACC/AHA dyslipidemia guideline, as summarized in the ACC’s journal scan, brings back LDL-C and non-HDL-C treatment goals. A lipid panel is still the starting test. An NMR LipoProfile adds detail on top of it rather than replacing it. See what a lipid panel costs for that starting test.

NMR LipoProfile vs ApoB

ApoB and LDL-P both estimate how many atherogenic particles are in the blood. They do it in different ways.

Every LDL, VLDL, and lipoprotein(a) particle carries one molecule of apolipoprotein B, according to a narrative review in JAMA Cardiology. So an ApoB level works as a single-number count of all those particles. LDL-P counts LDL particles specifically and comes with size and subclass detail.

The 2026 guideline gives ApoB a defined, selective role. According to the ACC summary of the guideline, ApoB may be measured to assess residual risk and guide treatment in people who have reached their LDL-C and non-HDL-C goals. That applies to people with cardiovascular-kidney-metabolic syndrome, type 2 diabetes, high triglycerides, or known cardiovascular disease. The ACC summary does not describe a role for NMR particle testing. The full guideline text is behind a paywall, so this page relies on the published abstract and the ACC summary.

In practice, ApoB is the simpler, guideline-recognized particle measure. An NMR LipoProfile is the choice when you or your clinician also want particle size, small LDL-P, HDL particle detail, or the LP-IR score. For ApoB on its own, see what an ApoB test costs.

NMR vs ion mobility vs ultracentrifugation

NMR, ion mobility, and ultracentrifugation are three laboratory methods for breaking lipoproteins into fractions. They do not produce interchangeable results. An analytical review in Clinica Chimica Acta of methods for small dense LDL found no gold-standard method. It also noted that method comparison is difficult. Compare results over time on the same method and lab.

• NMR spectroscopy reads particle concentrations and sizes from the sample’s NMR signal, as described above.
• Ion mobility separates lipoprotein particles by size and counts them directly. It reports particle number and size, and an LDL pattern.
• Ultracentrifugation physically separates lipoprotein fractions by density. Mito’s ultracentrifugation panel reports cholesterol content by fraction, with LDL cholesterol measured directly rather than estimated. It does not report particle counts.

Which Mito panel uses which method

Each panel below is described by the biomarkers listed on its product page as of October 2, 2026. The product page is the current source for each panel’s exact contents.

• Lipoprotein Particle Panel (NMR) (NMR): LDL particle number, small LDL particles, LDL particle size, large HDL particles, large VLDL particle number, and lipoprotein fraction results. No standard lipid panel.
• Lipoprotein Fractionation (NMR) with Lipid Panel (NMR plus standard lipids): the NMR particle results above, plus total cholesterol, LDL-C, HDL-C, triglycerides, non-HDL cholesterol, and ratios.
• Lipid Panel with Reflex to Lipoprotein Particle Assessment by NMR (standard lipids first, NMR by reflex): a standard lipid panel. The lab adds the NMR particle assessment only when the lipid results meet its reflex criteria.
• Lipoprotein Fractionation Panel, Ion Mobility (ion mobility): LDL particle number, small LDL particles, LDL particle size, LDL particle pattern, and large HDL particles.
• Lipoprotein Fractionation Panel (Ultracentrifugation) (ultracentrifugation): total cholesterol, directly measured LDL cholesterol, HDL cholesterol, triglycerides, and pre-beta lipoprotein. No particle counts.
• Advanced Cholesterol Panel (standard lipids, ApoB, Lp(a), and ion mobility subfractions): a standard lipid panel plus ApoB, lipoprotein(a), LDL particle number, small LDL particles, LDL particle size and pattern, and large HDL particles.

If your question is the NMR LipoProfile itself, the two NMR panels are the direct match. The ultracentrifugation panel answers a different question: how much cholesterol each fraction carries.

Do you need to fast for an NMR LipoProfile?

Fasting instructions for lipoprotein testing differ by panel and lab. Follow the instructions on the product page and on your order rather than a single general rule.

On Mito’s product pages, the ion mobility panel asks for a fast of at least 8 hours where possible. The lipid panel with NMR reflex does not require fasting. For a standard cholesterol test, MedlinePlus notes that you may need to fast for 9 to 12 hours and that your provider will tell you whether to.

Eating does change some lipoprotein results. In a study of 15,397 adults measured by ion mobility and a cholesterol subfraction method, nonfasting participants had higher triglycerides and slightly higher VLDL particle levels, especially large VLDL. Their LDL particle levels were lower, and small dense LDL did not differ by fasting status. The authors described the differences as small. Testing the same way each time keeps repeat results comparable.

How to read NMR LipoProfile results

Read each result against the reference interval printed on your own report. NMR reference intervals are set by the laboratory and can differ between labs and between methods, so a number from one lab or method should not be judged against another’s ranges.

A few principles help:

• Start with LDL-P alongside LDL-C. The question is whether they agree. A high LDL-P with an acceptable LDL-C is the discordant pattern the test is designed to find.
• Treat size and subclass results as context. Small LDL-P and LDL size describe the particle mix. LDL-P carries the main particle-number result.
• Read LP-IR as a pattern. A higher score suggests insulin resistance. Glucose, HbA1c, and fasting insulin are the direct measures.
• Compare like with like. Track changes on the same method and, ideally, the same lab.

Each biomarker page linked in the report section above explains that marker in more detail. A clinician should interpret an abnormal or discordant result in the context of your overall risk.

Limitations of the NMR LipoProfile

An NMR LipoProfile gives more detail than a lipid panel. More detail does not always mean better risk prediction.

• Risk prediction is comparable, not clearly superior. In the Women’s Health Study of 27,673 initially healthy women, NMR particle measures predicted cardiovascular disease about as well as standard lipids and apolipoproteins, but not better. Adding LDL-P or ApoB to a model that already included the total-to-HDL cholesterol ratio did not meaningfully improve risk classification. That study included only women.
• Methods are not interchangeable. Particle results from NMR and ion mobility differ by method, and there is no gold standard (Clinica Chimica Acta review).
• Guidelines are built on other measures. The 2026 ACC/AHA guideline sets treatment goals with LDL-C and non-HDL-C and names ApoB for selective use.
• It costs more and can take longer than a lipid panel, as the Frontiers in Nuclear Medicine review notes.

How much does an NMR LipoProfile cost?

The current price of each panel is on its product page. The Lipoprotein Particle Panel (NMR) page shows the member and non-member prices and the states where it is available. Members pay our cost for the test: Mito does not profit from your tests and makes its money on the membership. Prices for the other panels in the table above are on their own product pages.

Next step

If you already have a lipid panel and want to know whether your LDL particle number matches your LDL cholesterol, the Lipoprotein Particle Panel (NMR) is the direct test. If you want the standard lipid results on the same report, choose Lipoprotein Fractionation (NMR) with Lipid Panel. If you want only a single particle-count number, an ApoB test is the simpler option.

For background on high LDL itself, see what high LDL cholesterol means and ways to lower LDL cholesterol naturally.

Related guides

• Lipid Panel Cost
• ApoB Test Cost
• At-Home Cholesterol Test
• Lipoprotein(a) Test Cost

Medical disclaimer

This guide is for informational purposes only. It does not diagnose any condition or recommend treatment. A qualified clinician should interpret lipoprotein results in the context of your history, other test results, and overall cardiovascular risk.

Frequently asked questions

Is an NMR LipoProfile the same as a lipid panel?

No. A standard lipid panel reports how much cholesterol and triglyceride the blood carries. An NMR LipoProfile counts lipoprotein particles and measures their size. Some NMR orders bundle a lipid panel on the same report, so check which version you are ordering.

Why would a doctor order an NMR LipoProfile?

Usually to check whether LDL particle number agrees with LDL cholesterol. The two can disagree, most often when triglycerides are high, with insulin resistance or diabetes, or when LDL cholesterol is already low. A clinician may also use it to look at particle size or the LP-IR score.

Do you need to fast for an NMR LipoProfile?

Instructions differ by panel and lab. Some lipoprotein panels ask for a fast of 8 hours or more, while some lipid panel orders do not require it. Follow the instructions on the exact product page and on your order.

Is an NMR LipoProfile better than an ApoB test?

They answer a similar question in different ways. ApoB is a single number that reflects the total count of atherogenic particles. An NMR report counts LDL particles and adds size and subclass detail. The 2026 ACC/AHA dyslipidemia guideline names ApoB for selective use when treatment goals are met, and large studies have not shown NMR to be clearly better than ApoB or standard lipids for predicting risk.

Does an NMR LipoProfile include an insulin resistance score?

Some versions do. The LP-IR score combines six NMR lipoprotein measures into one insulin resistance score. Whether it appears depends on the exact test ordered, so check the list of biomarkers on the product page.