How is non-HDL-C calculated?

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Multiple Choice

How is non-HDL-C calculated?

Non-HDL-C represents all atherogenic cholesterol carried by lipoproteins other than HDL. Since total cholesterol equals the sum of LDL-C, HDL-C, and VLDL-C (plus other remnants), subtracting HDL-C from total cholesterol leaves LDL-C plus VLDL-C and remnants—the atherogenic cholesterol fraction. So the standard calculation is total cholesterol minus HDL-C. This can also be viewed as LDL-C plus VLDL-C, with VLDL-C often estimated as triglycerides divided by 5 (mg/dL) when using typical units. The other options don’t fit: adding LDL-C to HDL-C would omit the VLDL/remnant portion; adding triglycerides to HDL-C pairs a fatty substance with cholesterol and isn’t a direct measure of non-HDL-C; subtracting LDL-C from total leaves HDL-C plus VLDL-C, not the full atherogenic fraction.

Non-HDL-C represents all atherogenic cholesterol carried by lipoproteins other than HDL. Since total cholesterol equals the sum of LDL-C, HDL-C, and VLDL-C (plus other remnants), subtracting HDL-C from total cholesterol leaves LDL-C plus VLDL-C and remnants—the atherogenic cholesterol fraction. So the standard calculation is total cholesterol minus HDL-C. This can also be viewed as LDL-C plus VLDL-C, with VLDL-C often estimated as triglycerides divided by 5 (mg/dL) when using typical units.

The other options don’t fit: adding LDL-C to HDL-C would omit the VLDL/remnant portion; adding triglycerides to HDL-C pairs a fatty substance with cholesterol and isn’t a direct measure of non-HDL-C; subtracting LDL-C from total leaves HDL-C plus VLDL-C, not the full atherogenic fraction.

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