CPT® Code 80417

The CPT® Code 80417 refers to a specific laboratory test known as the Peripheral vein renin stimulation panel, which is utilized primarily for diagnosing renovascular hypertension. This condition may arise from renal artery stenosis (RAS), characterized by a narrowing of the renal blood vessels, often due to the buildup of atherosclerotic plaque or fibromuscular hyperplasia. In cases where hypertension is attributed to RAS, treatment options may include the use of angiotensin-converting enzyme (ACE) inhibitors, which can help manage blood pressure levels. The peripheral vein renin stimulation test is designed to assess the baseline level of renin in the peripheral blood circulation and to observe any changes that occur after the administration of an ACE inhibitor, specifically captopril. To ensure accurate results, patients are required to discontinue any diuretics and ACE inhibitors at least 14 days prior to the test. Additionally, they must adhere to a normal sodium diet, consuming between 100 to 200 mEq of sodium per day for three days leading up to the test. The procedure involves specific positioning of the patient: if a supine test is indicated, the baseline blood sample must be drawn between 8 and 10 a.m. after the patient has been lying down for a minimum of two hours. Conversely, if the test is to be conducted in an upright position, the blood sample should be collected before noon, with the patient sitting or standing for at least two hours prior to the draw. The initial blood sample is obtained through a separate venipuncture, and after administering an oral dose of captopril (25-50 mg), a second blood sample is collected 30 minutes later. The serum or plasma from these samples is then analyzed using quantitative immunoradiometry to evaluate renin levels, providing critical information for the diagnosis and management of renovascular hypertension.