Lipoprotein (a) is low-density lipoprotein (LDL) with an added apolipoprotein (a) attached to the apolipoprotein (b). It is synthesised in the liver and carries cholesterol in the blood. Lipoprotein (a) is involved in the development of coronary heart disease. Anti-human apolipoproteinLp(a) test is used to check for the risk of heart diseases.