In the Friedewald equation, the term Triglycerides/5 is used to estimate the concentration of which lipoprotein fraction?

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Multiple Choice

In the Friedewald equation, the term Triglycerides/5 is used to estimate the concentration of which lipoprotein fraction?

In this context, the triglyceride component is used to estimate the cholesterol content of very-low-density lipoprotein particles. VLDL carries most of the circulating triglycerides, and the typical mass ratio of triglyceride to cholesterol in VLDL is about 5:1. So, dividing triglycerides by 5 gives an estimate of VLDL cholesterol (VLDL-C). This estimated VLDL-C is then subtracted from the total cholesterol along with the HDL-C to derive LDL-C in the Friedewald equation: LDL-C ≈ TC − HDL-C − TG/5. The method works best with fasting samples and triglycerides below ~400 mg/dL; non-fasting samples or high triglyceride levels reduce accuracy and may require direct measurement of LDL-C.

In this context, the triglyceride component is used to estimate the cholesterol content of very-low-density lipoprotein particles. VLDL carries most of the circulating triglycerides, and the typical mass ratio of triglyceride to cholesterol in VLDL is about 5:1. So, dividing triglycerides by 5 gives an estimate of VLDL cholesterol (VLDL-C). This estimated VLDL-C is then subtracted from the total cholesterol along with the HDL-C to derive LDL-C in the Friedewald equation: LDL-C ≈ TC − HDL-C − TG/5. The method works best with fasting samples and triglycerides below ~400 mg/dL; non-fasting samples or high triglyceride levels reduce accuracy and may require direct measurement of LDL-C.

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