What does it measure?
LDL particles carry cholesterol that can contribute to plaque in artery walls. The Martin–Hopkins method estimates LDL cholesterol from total cholesterol, HDL, and triglycerides. It uses an adjustable factor rather than the fixed triglyceride factor in the older Friedewald calculation. [1]
Before reading the calculation
- Inputs
- Total cholesterol, HDL cholesterol and triglycerides from one lipid profile.
- Method
- Martin–Hopkins uses an adjustable factor to estimate the cholesterol carried by triglyceride-rich particles, then derives LDL. Confirm which version the laboratory uses.
What can the result mean?
A higher LDL generally signals more cholesterol exposure linked to atherosclerosis over time. What needs action depends on your overall risk and treatment history. A lower result may be an intended treatment effect. There is no single target that fits every person and every clinical situation. [2]
Total cholesterol, HDL cholesterol and triglycerides from one lipid profile.
- Method
- Martin–Hopkins uses an adjustable factor to estimate the cholesterol carried by triglyceride-rich particles, then derives LDL. Confirm which version the laboratory uses.
When is it useful, and how is it read?
For prevention or treatment follow-up, compare the method as well as the number. Triglycerides affect calculation reliability, and non-HDL cholesterol or, in selected situations, apoB can add context when LDL seems inconsistent with the rest of the lipid profile. [1] [2]
Reading the results together
| Marker | What it adds |
|---|---|
| LDL Cholesterol (Martin-Hopkins calculation) | Estimated cholesterol carried in LDL. |
| Non-HDL Cholesterol | Cholesterol outside HDL, including LDL and remnants. |
| Apolipoprotein B | A separate view of atherogenic particle number. |
They measure related but different things. Which adds useful information depends on triglycerides, treatment and overall risk. [1] [3] [4] [5]
What can affect it?
This is an estimate, so the quality of the input tests and triglyceride level matter. Original and extended Martin–Hopkins versions have different validation settings. A report should identify the method, particularly when triglycerides are high or results change after a laboratory switch. [1]
The calculation method can change the reported LDL
Martin–Hopkins estimates LDL using an adjustable factor rather than the fixed factor in the older Friedewald equation. A change in laboratory method can therefore shift the reported LDL even when the measured lipid inputs are similar. [1]
Questions you might have
Is calculated LDL a separate blood measurement?
No. It is estimated from three lipid measurements. The name of the calculation helps explain why two laboratories may report slightly different estimates. [1]
What comes next?
Compare results using the same units and note any method changes. Your clinician may consider non-HDL cholesterol, apoB, or another LDL assessment when the estimate is uncertain. Discuss family history and existing heart or vascular disease before deciding on food changes or medication. [2]
Is this LDL estimate reliable with my triglycerides, and what goal fits my overall risk?
The reference interval and units on your report are part of understanding your result. Understand units, reference intervals, and treatment targets.
Sources & references
Medical references & original research
- Martin et al. — A novel method versus Friedewald for estimating LDL cholesterol (original study, 2013)
- 2026 ACC/AHA multisociety guideline on the management of dyslipidemia
- American Heart Association — 2026 guideline on the management of dyslipidemia
- Mayo Clinic — Cholesterol ratio or non-HDL cholesterol
- Mayo Clinic Laboratories — Apolipoprotein B, serum
Books we consulted
References that informed our explanations of the test and its context.
- Pagana KD, Pagana TJ, Pagana TN. Mosby’s Diagnostic and Laboratory Test Reference. 14th ed. Elsevier; 2019.
Practical-section sources accessed: .
For general health education. Interpreting your result and deciding on tests or treatment requires your health context and a qualified clinician.
