CT RENAL ANGIO
Also Known As
Lab Test
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About The Test
- What the test does: Uses X-rays and contrast dye to create high-resolution maps of the renal arteries.
- Why kidneys need special imaging: These arteries are only a few millimetres wide; early narrowing can raise blood pressure or damage kidney tissue long before symptoms appear.
2. What is Renal Angiogram?
A renal angiogram is a specialised vascular imaging study that reveals the size, shape, and flow of the renal artery and its branches.
| Type | How it differs |
|------|----------------|
| Conventional catheter angiography | Thin tube threaded through groin; highest detail, small incision |
| CT renal angi | IV line only, 3-D images in seconds, outpatient friendly |
| MR renal angiogram | No radiation, longer scan, ideal for contrast allergies |
3. When and Who Needs to Take a Renal Angiogram?
Symptoms that signal testing
- Sudden, severe high blood pressure (especially under 40 or over 60)
- Unexplained drop in kidney function
- Abnormal whooshing sound (bruit) heard over the abdomen
Age and risk factors
- Adults 18-80 with hypertension resistant to 3+ medications
- Smokers, diabetics, or those with a family history of vascular disease
List of Parameters
- Artery diameter (normal: 4–6 mm)
- Stenosis percentage (mild <50 %, moderate 50–70 %, critical >70 %)
- Blood-flow velocity measured with Doppler if catheter study is done
Why This Test
- Detect renal artery stenosis before kidneys lose function
- Evaluate hypertension causes when medication fails
- Pre-surgical planning for kidney transplant or tumour removal
When to Take Test
Benefits
Benefits of Taking the Test
- Early detection: Catch vessel disease before dialysis is needed
- Minimally invasive: Only an IV line for CT renal angi
- Guides precise treatment like stenting or medication changes
Illnesses Diagnosed with CT Renal Angiography
- Renal artery stenosis (plaque build-up or fibromuscular dysplasia)
- Fibromuscular dysplasia (web-like narrowing in younger women)
- Aneurysms and fistulas (ballooning or abnormal connections)
Preparing for test
- Fasting guidelines: Nothing by mouth 4-6 hours before
- Medication adjustments: Hold metformin 48 h; bring insulin plan if diabetic
- Consent process: Written form plus verbal explanation in English, Hindi, or Kannada
11. Pre-requisites
- Kidney function tests (Creatinine, eGFR) within 30 days
- Allergy screening: Previous contrast or shellfish reactions noted
12. Best Time to Take the Renal Angiogram
- Morning appointments for easy fasting
- Schedule around contrast clearance: If dialysis is needed, same-day slot can be arranged
13. Eligibility
- Adults with hypertension or kidney issues who meet lab criteria
- Contra-indications: Pregnancy (unless urgent), severe contrast allergy uncontrolled by pre-medication
14. Procedure for Taking a Renal Angiogram
- Change into gown; vitals checked
- IV line inserted for CT renal angi (or groin prep for catheter study)
- Contrast injection—warm feeling for 10–15 seconds
- Scan lasts 5–10 minutes; hold breath when asked
- Recovery and monitoring for 30 minutes
15. Caution Before Taking the Test
- Inform about allergies (iodine, drugs, latex)
- Diabetic medication alerts: Resume metformin only after kidney function review
Test Results
Results and Interpretations
| Finding / Observation | Description | General Interpretation / Significance |
|---|---|---|
| Normal renal angiogram | Renal arteries appear widely open with smooth walls and no blockages | Indicates healthy kidney artery status; routine monitoring advised |
| Mild stenosis (<50%) | Slight narrowing of the renal artery due to early plaque or fibromuscular changes | May require lifestyle changes and medication to prevent progression |
| Moderate stenosis (50–70%) | Significant arterial narrowing reducing blood flow moderately | Needs closer medical evaluation; may impact kidney function or blood pressure control |
| Critical stenosis (>70%) | Severe artery narrowing that greatly restricts blood flow | High risk of kidney damage; intervention such as angioplasty or surgery is usually recommended |
Risks & Limitations
- Contrast reactions: Rare (1 in 1,000) itching, rash, or in very few cases anaphylaxis
- Radiation exposure: Equivalent to ~6 months of natural background; dose kept ALARP at Cadabams Diagnostics
- Not suitable for patients with very poor kidney function without dialysis planning
5. Types of Renal Angiogram
- Conventional catheter angiography
Gold-standard for intervention (angioplasty or stent placement). - CT renal angiogram
Combines speed, comfort, and 3-D detail; no overnight stay. - MR renal angiogram
Uses magnetic fields and gadolinium; great for children or pregnant patients when essential.
FAQs
Is the renal angiogram painful?
No. You may feel a brief warm flush when contrast is injected.
How long does the test take?
CT renal angi: 30 minutes total, including prep. Catheter study: 1–2 hours.
When will I get my normal renal angiogram results?
Within 24 hours for routine scans; immediately if critical.
Can I drive home after the procedure?
Yes, after CT renal angi if no sedative used. Bring a companion for catheter studies.
What should I do after the scan?
After the scan, you can immediately resume your normal diet and activities. We strongly encourage you to drink plenty of water for the next 24 hours. This will help your kidneys flush the contrast dye from your system more efficiently.
When will my doctor get the results?
The radiologist's in-depth report is typically finalized and sent to your referring physician within 24 to 48 hours after your scan. Your doctor will then contact you to discuss the findings and the next steps in your care.