Requirements for the four hypertension tests include fasting before the test, eating a light diet, stopping medication, and avoiding strenuous exercise. 1. You must fast for 12 hours before the test, go to the hospital the day before the blood test to open the blood test form, and don’t eat after 20 o’clock the night before, but you can drink a small amount of water. 2. Before the blood test, you should pay attention to a light diet for more than three days, and all antihypertensive drugs should be stopped for at least three weeks. For patients who are not suitable for stopping drugs, they can switch to antihypertensive drugs that have less effect on plasma renin levels. In addition, stop taking diuretics for at least four weeks and stop taking birth control pills for at least six weeks. 3. Strenuous exercise should not be performed for some time before blood collection, and patients should remain in the supine position for at least 1.5-2 hours before blood collection. The collected samples should be centrifuged as soon as possible, and the plasma should be kept at -20 degrees Celsius for cryopreservation. If the time of cryopreservation is too long, the accuracy of laboratory indicators will be affected. 4. The quadruple test for hypertension refers to a test of the renin-activated angiotensin-aldosterone system (including angiotensin at 4 degrees Celsius, angiotensin at 37 degrees Celsius, renin-activated and aldosterone). The main purpose of the four tests is to determine whether the hypertension is primary or secondary, which will help the clinician to provide targeted treatment according to the specific cause of the disease. It is recommended to choose reasonable examination and standardized treatment under the guidance of doctors.