Kidney Blood Flow Doppler
Imaging · Imaging
Available in:Hisar
Available at 1 lab
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₹5,000
About this test
What is Kidney Blood Flow Doppler?
Kidney Blood Flow Doppler is an ultrasound imaging test that uses sound waves to create a picture of how blood moves through the kidneys. It helps doctors see the size, shape, and blood flow patterns of the kidneys and the renal arteries.
Key Parameters Measured
| Parameter | What it shows |
|---|---|
| Peak Systolic Velocity (PSV) | Speed of blood during heart contraction |
| End‑Diastolic Velocity (EDV) | Speed of blood when the heart relaxes |
| Resistive Index (RI) | Resistance to blood flow in the kidney arteries |
| Renal Artery Diameter | Size of the main artery supplying the kidney |
Why is it Done?
- To evaluate kidney function when there are symptoms like high blood pressure, protein in urine, or unexplained kidney pain.
- To screen for kidney artery narrowing (renal artery stenosis) in patients with resistant hypertension.
- To monitor known kidney disease or transplant kidney health.
- As part of a routine check‑up in high‑risk patients (diabetes, hypertension).
Early Detection
This test can help identify signs of renal artery stenosis, chronic kidney disease, or vascular abnormalities, but it does not diagnose a disease on its own. A doctor interprets the results together with symptoms, history, and other investigations.
What Abnormal Results May Indicate
- High PSV or RI may suggest narrowed arteries or increased resistance.
- Low PSV or EDV could indicate poor blood supply or severe artery blockage.
- Changes in kidney size or shape may point to chronic damage or scarring.
Many factors—hydration status, medications (e.g., ACE inhibitors), recent exercise, or dietary sodium—can influence these values.
Who Might Be Advised to Get This Test?
- Adults with uncontrolled hypertension.
- Patients with diabetes and kidney concerns.
- Individuals with a history of kidney stones or chronic kidney disease.
- Those undergoing evaluation before kidney transplant.
Quick Summary
Kidney Blood Flow Doppler is a non‑invasive ultrasound that visualises blood flow in the kidneys, helping doctors spot vascular problems and monitor kidney health.
Used for detecting / monitoring
Before your test
Preparation
- Fasting: No fasting required for a kidney Doppler ultrasound.
- If combined with a fasting test (e.g., blood glucose), follow the longest fasting period required.
- What to do: Wear loose, comfortable clothing. No special diet or hydration instructions are needed.
- Procedure: A gel is applied to the abdomen and a handheld probe is moved over the kidney area. The test takes about 15–20 minutes.
- Discomfort: None; the probe is non‑invasive and painless.
- Precautions: Avoid heavy exercise 24 hours before the scan if you have a kidney transplant or severe kidney disease, as it may affect blood flow.
- Final note: Confirm any specific preparation with your doctor or the lab. This information is for educational purposes only and not a substitute for professional medical advice.
Sample type: Imaging
Report parameter guide
Resistive Index (RI)
A ratio that reflects resistance to blood flow in the kidney vessels
Low: May indicate low resistance, possibly due to vasodilation or early kidney injury
High: May indicate high resistance, often seen in chronic kidney disease, obstruction, or severe hypertension
Pulsatility Index (PI)
Measures the variability of blood flow velocity during the cardiac cycle
Low: Low PI can suggest low vascular resistance or early renal dysfunction
High: High PI often points to increased resistance, such as in renal artery stenosis or advanced kidney disease
Peak Systolic Velocity (PSV)
The maximum blood flow speed during heart contraction
Low: Low PSV may indicate reduced renal perfusion or severe obstruction
High: High PSV can be seen in renal artery stenosis or hyperdynamic circulation
End Diastolic Velocity (EDV)
Blood flow speed at the end of heart relaxation
Low: Low EDV may reflect high resistance or impaired diastolic filling
High: High EDV usually suggests low resistance and good diastolic flow
Renal Artery Peak Systolic Velocity
Maximum speed of blood in the renal artery during systole
Low: Low velocity may indicate reduced renal perfusion or severe obstruction
High: High velocity often indicates renal artery stenosis or narrowed artery
Renal Artery Resistive Index
Resistance index specific to the renal artery
Low: Low RI may suggest low resistance or early kidney injury
High: High RI commonly indicates renal artery stenosis, chronic kidney disease, or obstruction
Renal Artery Pulsatility Index
PI specific to the renal artery
Low: Low PI may reflect low resistance or early dysfunction
High: High PI often points to increased resistance such as stenosis or advanced kidney disease
Renal Artery Stenosis Presence
Whether a narrowing of the renal artery is detected
High: Presence of stenosis can indicate atherosclerosis, fibromuscular dysplasia, or other narrowing causes