<unk> s, which are aggregates of proteins and lipids, allow the circulation of hydrophobic lipids in the body.<unk>  of lipids and<unk> s metabolism have important health consequences, mainly on the cardiovascular system.<unk>  can be described as abnormalities in the level of the lipids, which include cholesterol and triglycerides, or as abnormalities in the levels of<unk> s that include LDL, HDL, VLDL and chylomicrons.<unk>  have been initially classified in 1967 into different phenotypes by Fredrickson according to the type of<unk> s that accumulate. However; Fredrickson's classification of hyperlipoproteinemias took into consideration the elevation in chylomicrons, LDL, VLDL but did not include abnormalities in HDL levels.  Other classifications have been suggested, one of which is the National Cholesterol Education Program (NCEP) classification of<unk> .  NCEP classifies lipid<unk>  according to laboratory cut off points for the levels of total cholesterol, LDL-C and HDL.<unk>  can be classified according to different criteria.  First of all,<unk>  can be classified as primary<unk>  resulting from genetic mutations and secondary to other diseases.  Another way of classifying<unk>  is as hypolipidemia (or hypolipoproteinemia) and hyperlipidemia (hyperlipoproteinemia) where the<unk>  levels are decreased and increased respectively.  However, the latter classification is not precise and creates some ambiguity, because some people can be labeled as having hyperlipidemia but have simultaneously high level of some<unk> s and low levels of other<unk> s depending on the underlying pathophysiology.  Hence, a better term to describe the constellation of abnormal lipid profiles is<unk>  of<unk> s", or dyslipoproteinemia or dyslipidemia.
Lipoprotein disorders
Endocrine diseases
Hyperlipoproteinemia laboratory findings
Sickle-cell disease causes
Dermatological lesions
Gaucher's disease risk factors
VLDL hyperlipidemia
Cancer risk factors