MRI RENAL ANGIOGRAPHY
Also Known As
Lab Test
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About The Test
- Non-invasive: No catheters, no incisions
- No radiation: Uses magnetic fields and radio waves only
- Contrast dye: A small IV dose of gadolinium highlights the renal arteries
- Cadabams edge: 3T magnet strength for razor-sharp images and an optional same-day report so you can act fast
List of Parameters
| Parameter | What It Tells Us |
|---|---|
| Renal artery diameter | Normal ≥4 mm; <4 mm raises stenosis alarm |
| Stenosis % | <50 % mild, 50–70 % moderate, ≥70 % severe |
| Accessory renal arteries | Extra vessels can affect blood pressure control |
| Aortic plaque extension | Plaque in the aorta can spill into renal arteries |
Why This Test
- Pinpoint the cause of resistant hypertension
- Decide if you need renal artery angioplasty or surgery
- Rule out hidden vascular problems before major procedures
When to Take Test
Benefits
Benefits of Taking the Test
- Zero radiation—great for young adults or repeat follow-ups
- High-resolution 3D images—surgeons see every twist and turn
- Comfortable open-bore 3T scanner—reduces claustrophobia
- Same-day reporting option—start treatment sooner
Illnesses Diagnosed with Renal Angiography MRI
- Renal artery stenosis
- Atherosclerotic (plaque buildup)
- Fibromuscular dysplasia (twisty vessels in younger patients)
- Renal artery aneurysm
- Arteriovenous fistula—abnormal artery-to-vein links
Preparing for test
- Fast 4 hours before your appointment if contrast is planned
- Creatinine/eGFR blood test within the last 30 days
- List all implants: pacemakers, clips, coils, joint replacements
- Mention allergies: prior contrast reactions, asthma, shellfish
Pre-Requisites
- Recent kidney function test showing eGFR >30 mL/min/1.73 m²
- Signed consent for gadolinium administration
- Fasting confirmation slip (if contrast required)
Best Time to Take the Test
- Morning slots make fasting easier
- 7–10 days after recovery from any fever, cough, or acute illness
Eligibility
- Adults ≥18 years with stable kidney function
- Pediatric cases accepted only via specialist referral and sedation planning
Procedure Step-by-Step
- Check-in & IV line (15 min)
- Safety screening—remove metal, change into gown
- Scanner positioning—lie on table, coil over abdomen (30–45 min)
- Breath-hold instructions—short pauses for crisp images
- Contrast injection—quick push through IV
- Post-scan observation (15 min) for any reactions
Caution Before the Test
- Stop metformin 48 h prior if eGFR <45
- Pregnancy screening for women of child-bearing age
- Empty bladder before entering scanner—reduces motion artifacts
Test Results
Results and Interpretations
| Condition/Findings | Description (Example Patient Finding) | General Interpretation / Significance |
|---|---|---|
| Renal artery lumen diameter | ≥4 mm | Normal |
| Stenosis | <50 % | Mild—observe |
| Stenosis | ≥70 % | Severe—intervention likely |
| Normal flow void | Smooth, dark column of blood | No blockage |
| Focal stenosis | Sudden narrowing | Likely plaque or fibromuscular dysplasia |
| Post-stenotic dilation | Bulge just after narrowing | High-grade stenosis indicator |
| Renal Veins | Patent with normal caliber; Evidence of thrombus; Compression (e.g., Nutcracker syndrome – left renal vein between SMA and aorta) | Evaluates renal venous outflow. Thrombosis may cause renal dysfunction or flank pain. Nutcracker syndrome can result in hematuria or varicocele. |
| Presence of Stents / Grafts | Patent renal artery stent with no restenosis; Occlusion or narrowing of prior bypass graft | Used to evaluate post-procedural status. In-stent restenosis or graft occlusion can lead to recurrence of symptoms and requires follow-up or revision. |
Risks & Limitations
- Gadolinium caution: Rare risk of nephrogenic systemic fibrosis (NSF) in severe kidney disease (eGFR <30)
- Claustrophobia: Tell us—open-bore MRI or mild sedation is available
- Metal implants: Pacemakers, cochlear implants, or older aneurysm clips may contraindicate MRI
- Cost: Slightly higher than ultrasound, but lower long-term cost than repeated CT scans
FAQs
Is MRI renal angiography painful?
No. You’ll feel only a brief pinch when the IV goes in.
How long does the scan take?
30–45 minutes on the table, plus 15 minutes of observation.
Can I eat after the scan?
Yes. Resume your normal diet and hydration immediately.
When will I get results?
Standard reports within 24 hours; same-day option available at Cadabams Diagnostics.
Is gadolinium dye safe?
Yes, in patients with good kidney function. We screen every patient first.
What if I’m claustrophobic?
Our open-bore 3T MRI and mild sedation options keep you comfortable.