Plasma Renin Activity (PRA) Measurement

What Is Renin Activity Used For?

Renin activity is often measured when doctors suspect conditions like **hypertension (high blood pressure)**, **kidney disease**, or **aldosteroneism** (an imbalance in hormones that control blood pressure and fluid balance). It may also be used to evaluate how well your kidneys are responding to certain medications or treatments for these conditions.

How Is This Test Performed?

A blood sample is drawn from a vein in your arm. The sample is then processed to measure renin activity using a specialized laboratory method, often an **immunoassay** or **enzymatic technique**, to detect its presence in your plasma.

Why Might Your Doctor Order This Test?

Your doctor may recommend this test if you have symptoms like unexplained high blood pressure, frequent urination, swelling, or signs of kidney problems. It can also help diagnose or monitor conditions like **primary aldosteronism** or **renovascular hypertension** (kidney-related high blood pressure).

What Do Results Mean?

Results are typically reported as a rate (e.g., units per liter or per time period) and compared to reference ranges for your age and health status. Abnormal results may indicate whether your kidneys are producing too much or too little renin, which can guide treatment decisions.