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The remainder of the serum cholesterol after subtracting the HDL is the non-HDL cholesterol. The concentration of these other components, which may cause atheroma, is known as the non-HDL-C. This is now preferred to LDL-C as a secondary marker as it has been shown to be a better predictor and it is more easily calculated. [10]
LDL contains apolipoprotein B (apoB), which allows LDL to bind to different tissues, such as the artery wall if the glycocalyx has been damaged by high blood sugar levels. [8] If oxidised, the LDL can become trapped in the proteoglycans, preventing its removal by HDL cholesterol efflux. [8]
Cholesterol is tested to determine for "normal" or "desirable" levels if a person has a total cholesterol of 5.2 mmol/L or less (200 mg/dL), an HDL value of more than 1 mmol/L (40 mg/dL, "the higher, the better"), an LDL value of less than 2.6 mmol/L (100 mg/dL), and a triglycerides level of less than 1.7 mmol/L (150 mg/dL).
The idea that HDL cholesterol is good for you stems from a study conducted in the 1970s that determined high levels of HDL were linked with a low heart disease risk, explains Alfonso Waller, M.D ...
These groups, from least dense to most dense, are chylomicrons (aka ULDL by the overall density naming convention), very low-density lipoprotein (VLDL), intermediate-density lipoprotein (IDL), low-density lipoprotein (LDL) and high-density lipoprotein (HDL). LDL delivers fat molecules to cells.
The chemical reaction is the same as the total cholesterol measurement, except that the enzymes are blocked from acting on non-HDL lipoproteins by the reagent and their own PEG tails. [8] From these three data LDL may be calculated. According to Friedewald's equation: [9] [LDL] = [Total cholesterol] − [HDL] − [Triglycerides] / 5
Remnant cholesterol is composed primarily of VLDL, IDL and chylomicron remnants. Remnant cholesterol, also known as remnant lipoprotein and triglyceride-rich lipoprotein cholesterol is an atherogenic lipoprotein composed primarily of very low-density lipoprotein (VLDL) and intermediate-density lipoprotein (IDL) with chylomicron remnants.
For this reason, total LDL is referred to as "bad cholesterol," although only a fraction of it is actually bad. Standard chemistry panels typically include total triglyceride, LDL and HDL levels in the blood. Measuring the concentration of sd-LDL is expensive.