LDL 3.7mmol/L is a borderline elevated level, which is considered to be on the high side and not within the normal level and should be corrected promptly. LDL is a kind of cholesterol-rich lipoprotein, which is one of the risk factors of atherosclerosis. Clinically, the level of LDL is generally reflected by the content of LDL cholesterol, and its appropriate level is ≤3.4mmol/L, and its borderline level is 3.4~4.1mmol/L, and >4.1mmol/L is elevated, therefore, the LDL 3.7mmol/L belongs to the borderline level. mmol/L is a borderline level. Increased levels of LDL are positively correlated with the development of coronary heart disease, and diseases such as hypothyroidism and nephrotic syndrome can also cause elevated levels of this indicator. When LDL levels are abnormal, they should be actively treated under the guidance of a physician.