A Renal Artery Doppler Ultrasound is a specialized imaging test used to evaluate blood flow in the renal (kidney) arteries. It helps detect renal artery stenosis (narrowing), blockages, or other vascular abnormalities that can lead to hypertension (high blood pressure) and kidney dysfunction.
Resistant Hypertension (high blood pressure not controlled by medications).
Suspected Renal Artery Stenosis (RAS) (due to atherosclerosis or fibromuscular dysplasia).
Unexplained Kidney Dysfunction or Decreased Kidney Function (CKD).
Abnormal Kidney Function Tests (Elevated Creatinine, Low GFR).
Abdominal Bruit (whooshing sound in the abdomen, indicating turbulent blood flow).
Pre-Transplant Kidney Evaluation or Post-Transplant Complications.
Preparation:
Fasting for 6–8 hours before the test (reduces bowel gas for better imaging).
Avoid caffeine and smoking before the test.
Doppler Ultrasound Process:
The patient lies on the examination table.
A gel is applied to the abdomen or flanks.
A Doppler probe (transducer) is moved along the abdomen and flanks to visualize the renal arteries.
Blood flow velocity and waveforms are recorded for each kidney.
✅ Normal Flow: No significant obstruction; smooth blood flow.
🚩 Renal Artery Stenosis (RAS):
Mild (Less than 60% narrowing): Monitor with lifestyle changes and medication.
Moderate to Severe (60–99% narrowing): May require angioplasty, stenting, or surgery.
🚩 Turbulent Blood Flow: Suggests narrowing or blockage.
🚩 Renovascular Hypertension: High blood pressure caused by poor kidney blood flow.
✔ Detects early kidney-related hypertension.
✔ Prevents kidney failure from poor blood supply.
✔ Guides treatment decisions (medication vs. stenting/surgery).