Blood tests for dizziness are generally needed to check several items such as blood glucose, blood lipids, blood pressure, and blood count, because the common causes of dizziness are hypoglycemia, atherosclerosis, and anemia, which can be reflected in the relevant tests to help doctors initially determine the cause of the disease. In addition, depending on the test results, there may be additional tests for liver function, kidney function, blood sedimentation, blood rheology and other items. First of all, blood glucose is measured, because it is a simple and quick test, which can be measured by a blood glucose meter, and it is convenient to exclude hypoglycemia. Sudden dizziness is more common in people with hypoglycemia. Patients may experience dizziness, panic and weakness when their blood sugar drops rapidly. If the test is clear that hypoglycemia exists, glucose solution infusion is needed to relieve the discomfort. Secondly, blood lipids can be checked to rule out the possibility of atherosclerosis, especially for some middle-aged and elderly people, with the decline of body functions, carotid atherosclerosis or cerebral atherosclerosis often occurs, causing transient ischemia and hypoxia in the brain, leading to dizziness and headache, and in serious cases, impaired consciousness can occur. Again, blood pressure can be checked to rule out dizziness due to hypertension. When blood pressure rises, intracranial pressure also rises, and if there is long-term hypertension, the blood vessels in the brain become less tolerant to changes in blood pressure, and these conditions may cause dizziness. Finally, routine blood tests are a common test for most patients. If a patient has a white mouth and lips or is thin, a routine blood test may be scheduled to rule out the possibility of anemia. Patients with anemia may experience dizziness due to lack of blood and oxygen in the brain, as well as weakness and depression. The above tests are mainly to rule out the most common causes. Usually, doctors will also perform renal function, blood sedimentation, blood flow, D-dimer and other tests based on the results of the above three tests, combined with the results of vascular ultrasound and cranial ultrasound to clarify the specific cause and determine whether it is related to hypertensive nephropathy, insufficient blood supply to the brain, atherosclerosis and other causes, and guide the follow-up treatment.