The fats are one of the most important nutrients, and it is a complex of fatty acids (triglyceride), which is complex fats from a group of fatty acids and a source of energy for the body and a building material, cholesterol is a greasy substance with a corridor building and plays an important role in building the cell wall and producing hormones. Generally, fats are a biological substance for the body, but its surplus can cause the accumulation of negative plaques and thus limit the veins. Since fats do not dissolve well in the water, and since the contents of the body are out of water, the body uses special molecules that also consist of fats and protein and are called the lipoproteins to absorb fatty substances of the food and transfer them to the organs and function it needs. The examination of the fat level in the blood includes measurement of the following values: measuring the level of glyceride tribrid in the blood. Total cholesterol. HDL – lipoprotein with high density). The level of bad cholesterol (LDL – low density lipoprotein). It is possible to reduce the level of cholesterol and fat in the blood through a healthy and healthy diet and exercise regularly through medicine therapy. Depending on the results of large and leading research in the field, a set of rules, instructions and guidelines are developed regarding cholesterol and fat levels that need to be overcome to start taking medication to avoid diseases and even death, especially in people suffering from other risk factors, such as: diabetes. Smoke. Previous injuries on heart attacks. When is the examination performed? This investigation is one of the routine chemical blood tests, and it is performed to investigate and evaluate the risk of vascular diseases, as well as to make a decision if there is a need for treatment. This investigation is also used in people with a high level of fat and cholesterol in the blood to monitor the effectiveness of the treatment they receive to achieve the goals. In addition, the investigation is conducted to check the possibility of pancreatitis, as high levels of glyceri trilogy lead to pancreatitis, as well as when the patient is suspected of rare syndrome resulting in a significant increase in cholesterol and fat levels in the blood.