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Low-density lipoprotein cholesterol can be chemically measured: a new superior method
1Department of Laboratory Medicine, Niigata University School of Medicine, Niigata City, Japan.
The Journal of Laboratory and Clinical Medicine
|September 15, 1998
Summary
A new chemical assay accurately measures low-density lipoprotein (LDL) cholesterol, outperforming the Friedewald formula, especially for high triglyceride levels. This advancement improves cardiovascular disease risk assessment.
Area of Science:
- Biochemistry
- Clinical Chemistry
- Cardiovascular Medicine
Background:
- Elevated low-density lipoprotein (LDL) cholesterol is linked to increased coronary heart disease (CHD) risk.
- The Friedewald formula is commonly used for LDL cholesterol estimation but is unreliable with high triglyceride levels (> or =400 mg/dL).
Purpose of the Study:
- To develop and validate a novel chemical assay for direct LDL cholesterol measurement in serum.
- To overcome the limitations of the Friedewald formula in hypertriglyceridemic samples.
Main Methods:
- Investigated interactions between lipoproteins and various chemical agents.
- Developed a new serum LDL cholesterol assay protocol without immunoseparation or centrifugation.
- Validated the assay using 88 patient and 20 healthy volunteer serum samples with diverse triglyceride levels.
Main Results:
- The new assay demonstrated accuracy and precision meeting NCEP Lipid Standardization Panel criteria.
- Measurements were unaffected by matrix effects and showed good correlation with ultracentrifugal assays across all triglyceride levels.
- The assay proved superior to the Friedewald formula, particularly for samples with triglyceride concentrations > or =400 mg/dL.
Conclusions:
- The developed chemical assay provides a reliable method for determining LDL cholesterol levels, irrespective of triglyceride concentration.
- This assay offers a significant improvement over the Friedewald formula for accurate cardiovascular risk assessment.