CPT® Code 84244

The CPT® Code 84244 refers to a laboratory test specifically designed to measure the levels of renin in the blood. Renin is an important enzyme produced by the kidneys, which plays a crucial role in the regulation of blood pressure and fluid balance within the body. It is released in response to low sodium levels or a decrease in blood volume, initiating a cascade of hormonal responses that involve angiotensin and aldosterone. These hormones work together to help maintain mean arterial pressure, which is vital for ensuring adequate blood flow to organs and tissues. Elevated renin levels can indicate various medical conditions, including Addison's disease, cirrhosis, congestive heart failure, dehydration, hemorrhage, hypertension, hypokalemia, nephrotic syndrome, and renal tumors. Conversely, decreased renin levels may be associated with conditions such as hyperaldosteronism, the use of steroids, sodium-sensitive hypertension, or treatment with antidiuretic hormone (ADH). This test is often ordered alongside the Aldosterone test (CPT® Code 82088) to provide a more comprehensive assessment of the renin-angiotensin-aldosterone system. The blood sample required for this test is obtained through a procedure known as venipuncture, which is separately reportable. The analysis of the plasma involves two specific testing methods: a quantitative immunoradiometric assay for direct renin measurement and a quantitative radioimmunoassay for assessing plasma renin activity. These methodologies ensure accurate quantification of renin levels, aiding healthcare providers in diagnosing and managing related health conditions.