Homocysteine 22μmol/L is considered high, and active consultation is recommended. Usually homocysteine is a sulfur-containing amino acid, which is mainly formed as an intermediate product after the metabolism of nitrogenous acid and cysteine, and it can assist in the diagnosis of coronary heart disease and myocardial infarction, etc.; its normal value is between 5 and 15 μmol/L. Therefore, homocysteine 22 μmol/L exceeds the normal level, which is within a higher range. However, it should be noted that if high protein foods are consumed during the homocysteine test, as well as medications such as folic acid, the results of the test may be affected, resulting in an elevated or low level. In addition, homocysteine may be elevated in the presence of coronary artery obstruction, myocardial infarction, cerebral infarction, and other diseases. Therefore, a homocysteine level of 22 μmol/L should be taken seriously and treated promptly after the cause of the disease is clarified under the guidance of a doctor.