All four hypertension items are normal indicating that there is no secondary hypertension at the time of the body test. The main purpose of the four hypertension tests is to identify the cause of hypertension, determine whether it is primary or secondary, and then treat it. After secondary hypertension is ruled out, if all the tests are normal, then the blood pressure will be taken into account, and if it is high, primary hypertension is considered to be the most probable cause of hypertension. The four items of hypertension include: angiotensin at 4 degrees Celsius, angiotensin at 37 degrees Celsius, renin activity and aldosterone. In general, the reference range for angiotensin at 4 degrees Celsius is 0-120 ng/ml, and the reference range for angiotensin at 37 degrees Celsius is 0-130 ng/ml. The reference range for renin activity is 4-38pg/ml in the upright position; 4-24pg/ml in the prone position, and the reference range for aldosterone is 40-310pg/ml in the upright position; 10-160pg/ml in the prone position. It is important to keep the heart rate calm during the test, choose to test in the morning on an empty stomach, and avoid stimulating foods and medications the day before the test. Avoid stimulating foods and medications the day before the test, such as cigarettes, alcohol, and sleeping or neuroleptic drugs. According to the blood pressure and related test results in the physician’s guidance treatment, to avoid delaying the disease.