The normal value of homocysteine is 5-15 μmol/L, so homocysteine 17 μmol/L is higher than the normal value, but not to the extent of a serious elevation. Elevated homocysteine can cause damage to the endothelium of arteries, and LDL cholesterol in the blood, through the damaged endothelium, enters the inner wall of blood vessels causing the formation of atherosclerosis. Therefore, elevated homocysteine is an independent risk factor for atherosclerosis, especially for the diagnosis of ischemic cerebrovascular disease. Homocysteine should be tested at the same time as the patient presents with symptoms of cerebral ischemia. Patients with elevated values of this should be actively supplemented with folic acid to improve the state of the vascular endothelium and reduce the likelihood of further vascular damage.