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A Renal Scan is a diagnostic imaging test used to evaluate kidney function and structure. It is a simple and non-invasive procedure, with costs varying depending on the lab and city. Understanding normal scan results helps doctors detect issues early. The test is generally safe, with minimal discomfort or mild side effects.
What is a Renal or Kidney Scan?
A renal scan, also known as renal scintigraphy, is a medical imaging test that uses radioactive material to assess the function and appearance of the kidneys.
The objective of this examination is to assess the efficiency of the kidneys and identify any possible renal disorders or damages in their early stages.
During the examination, a small amount of radioactive material is injected into a vein, and a scanner locates the material in the kidneys, sending images to a computer for analysis.
Renal scans are also useful for monitoring the progress of patients after kidney transplants. This medical procedure can help healthcare providers diagnose and treat kidney-related conditions more effectively.
When is a Renal Scan Recommended?
A renal scan is usually ordered by healthcare providers when they suspect that a patient's kidneys may not be functioning properly.
This concern may arise after observing reduced kidney function levels during blood and urine tests on an X Ray. In such cases, a renal scan can help confirm a diagnosis and provide valuable information to help guide treatment.
- Renal scans may be ordered for patients allergic to the X-ray dye, as this test uses radioactive material instead.
- Patients who have undergone a kidney transplant may require a renal scan to ensure the new kidney functions properly.
- Individuals with high blood pressure (hypertension) may be ordered a renal scan to assess the health of their kidneys, which are involved in regulating blood pressure.
- Renal scans may also be ordered for patients who have blocked urinary drainage from their kidneys, as this can lead to kidney damage or infection.
How Does a Aenal Scan Work?
A nuclear medicine technologist performs a kidney test to capture images of a patient's kidneys. These images display blood flow in and out of the kidneys and urine flow through the ureters and bladder.
By analyzing these images, healthcare providers can determine if there is reduced kidney function or blockage, aiding in diagnosis and treatment planning.
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Why is a Renal Scan Performed?
A renal scan test helps your doctor assess how well your kidneys are functioning, as well as their size, shape, and position. Your doctor may recommend a renal scan if:
- You can't have contrast dye with other X-rays due to allergies or kidney issues.
- You’ve had a kidney transplant, and your doctor needs to check how well the new kidney is working and whether there are signs of rejection.
- You have high blood pressure, and your doctor wants to assess your kidney function.
- Your doctor wants to confirm whether a swollen or blocked kidney seen on other tests is causing a loss of function.
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Get Second OpinionWhat are the Types of Renal Scans?
Renal scans are performed by nuclear medicine technologists in four ways:
- ACE inhibitor renal scintigraphy: This medical examination aims to determine if there is any narrowing in the renal arteries, which can cause hypertension. The procedure involves taking images of the kidneys before and after the patient takes an ACE inhibitor, a medication that helps lower blood pressure. These images are then reviewed by a healthcare professional.
- Diuretic renal scintigraphy: This nuclear scan detects blockages in the kidneys or difficulties with urine flow. By taking images before and after patients take a diuretic, the healthcare professional can see how urine flows through the kidneys.
- Renal cortical scintigraphy: This kidney scan examines the functioning of the renal cortical tissue (tissue in the outer part of the kidneys). Around two hours after receiving an IV with a radioactive substance, a camera takes photographs.
- Renal perfusion: This nuclear medicine test examines blood flow to the kidneys. The renal scan assesses the diameter of the renal arteries and the function of the kidneys. During the procedure, a camera captures many photographs for a 20- to 30-minute period.
Are there any Risks or Side Effects of a Renal Scan?
Generally, the side effects of a renal scan are minimal. The procedure is safe, and the amount of radiation used is very small.
However, you may experience mild discomfort or bruising where the needle was inserted. Some people may feel a slight burning sensation when the radioactive material is injected, but this usually goes away quickly.
How to Prepare for a Kidney Scan?
Before undergoing a renal scan, it is essential to provide a comprehensive list of all medications, including vitamins and herbal supplements, to your healthcare provider.
Before having a renal scan kidney function test, you should:
- List of all medications, vitamins, and supplements with your healthcare provider. Some medications, such as NSAIDs, may need to be stopped.
- Inform your doctor if you're allergic to certain medications or latex.
- Tell your doctor if you are pregnant or breastfeeding, as the radioactive material could pose risks to the baby.
- If you have claustrophobia, let your healthcare provider know, as the camera may be close to you during the test.
- You may need to drink more water or empty your bladder before the procedure.
Talk to Your Doctor Before a Renal Scan:
- Individuals allergic to certain medications or latex should inform their healthcare provider before undergoing a renal scan.
- Claustrophobic individuals may find the scan uncomfortable, as the camera may come close to them during the procedure.
- Nursing mothers should not undergo a renal scan, as the radioactive material used during the procedure could enter their breast milk.
- Pregnant women, or those who suspect they may be pregnant, should not undergo a renal scan, as the procedure could harm the developing fetus.
How to Understand Renal CT Scan Results?
Once your renal CT scan is complete, a nuclear medicine radiologist will review the images and send a detailed report to your doctor. Your doctor will then go over the results with you.
If the results are abnormal, it could indicate:
- Kidney disease
- Cysts or tumors in the kidneys
- Blocked renal arteries from injury or trauma
- A blockage that prevents urine from flowing from the kidneys to the bladder
- Kidney inflammation due to infection
- Problems with a kidney transplant
- Kidney failure
Kidney size and shape can also affect the scan results, and an abnormal structure may require further investigation.
Who Should Take the Renal Scan?
A Renal Scan is recommended for individuals who are suspected of having kidney-related conditions. It is usually suggested for:
- People experiencing symptoms like swelling in the legs, blood in urine, or high blood pressure.
- Patients with known kidney disorders, such as obstruction or renal artery stenosis.
- Those undergoing evaluation before or after a kidney transplant.
- Children are born with urinary tract abnormalities.
- Elderly patients who have unexplained kidney dysfunction. This scan helps doctors assess how well the kidneys are working and detect any blockages, infections, or damage early.
What Type of Sample is Collected for the Renal Scan and How?
For a Renal Scan, no blood or urine sample is needed. Instead, a small amount of a radioactive tracer is injected into a vein, usually in your arm. This tracer travels to the kidneys, allowing special cameras to take detailed images.
The process is painless except for a minor prick during the injection, similar to a routine blood test.
Are There Other Ways to Collect the Sample for the Renal Scan?
Since a Renal Scan depends on imaging after a radiotracer injection, there are no alternative sample collection methods, such as urine collection or swabs. However, for some specialized cases:
- A catheter may be inserted if bladder imaging is needed alongside the renal scan (mainly in small children or very ill patients).
- Special pediatric protocols are available to reduce discomfort in infants. In general, the tracer injection method is the standard and safe for most patients.
How Long Does the Renal Scan Take?
The Renal Scan process is straightforward:
- Tracer Injection: Takes just a few minutes.
- Imaging Time: Depending on the type of renal scan (dynamic, static, or functional), capturing the images may take 30 to 90 minutes.
- In some cases, patients may be asked to wait and undergo delayed imaging for better assessment. Overall, you should spend about 1 to 2 hours at the diagnostic center for the entire process.
When Will I Get My Renal Scan Results?
You will usually receive your Renal Scan results within 12 to 24 hours, depending on the lab's workflow.
- Reports can be shared via WhatsApp, email, or as a printed hard copy.
- Once you have the report, our doctor or your referring physician will review it with you, explain the findings, and guide you on any next steps like medication, surgery, or further tests if required.
What Should I Do After Getting My Renal Scan Results?
After you receive your Renal Scan results:
- Consult your doctor immediately to understand the findings.
- If abnormalities are detected, your doctor may suggest starting treatment, medication, or surgical intervention.
- In some cases, additional tests such as blood work, CT scans, or an MRI may be recommended to confirm the diagnosis.
- Follow-up appointments are crucial to monitor your kidney health based on the scan's outcome.
Is the Renal Scan Painful?
The Renal Scan itself is painless.
- You may feel a small prick during the injection of the tracer, similar to getting a vaccine or a blood test.
- Some patients might feel a cool sensation as the tracer is injected.
- There are generally no side effects from the radiotracer, and you can resume normal activities shortly after the test. Most people find the procedure comfortable and easy to undergo.
What are the Factors Affecting Renal Scan Cost?
Several factors can influence the cost of a Renal Scan, such as:
- Location: Tests in metro cities are generally more expensive than in smaller towns.
- Test Method: Additional techniques like delayed imaging or dual-phase studies can add to the cost.
- Doctor's Consultation Fees: Some centers include radiologist interpretation charges separately.
- Additional Services: Home collection for injection or premium reporting services may increase the overall cost. It is advisable to confirm the exact package before booking your scan.
How Much Does the Renal Scan Cost in India?
The average cost of a Renal Scan in India is approximately Rs. 4,000 to Rs. 9500. However, prices can vary depending on the hospital and the city.
Renal Scan Test Price in Different Cities Across India
| City | Price |
| Hyderabad | Rs. 4,000 to Rs. 9500 |
| Bangalore | Rs. 4,000 to Rs. 9500 |
| Vizag (Visakhapatnam) | Rs. 4,000 to Rs. 9500 |
| Nashik | Rs. 4,000 to Rs. 9500 |
| Kurnool | Rs. 4,000 to Rs. 9500 |
| Karimnagar | Rs. 4,000 to Rs. 9500 |
| Warangal | Rs. 4,000 to Rs. 9500 |
| Vizianagaram | Rs. 4,000 to Rs. 9500 |
| Chandanagar | Rs. 4,000 to Rs. 9500 |
| Srikakulam | Rs. 4,000 to Rs. 9500 |
| Pune | Rs. 4,000 to Rs. 9500 |
| Sangamner | Rs. 4,000 to Rs. 9500 |
| Chh. Sambhaji Nagar | Rs. 4,000 to Rs. 9500 |
| Nellore | Rs. 4,000 to Rs. 9500 |
| Kakinada | Rs. 4,000 to Rs. 9500 |
| Navi Mumbai | Rs. 4,000 to Rs. 9500 |
| Nizamabad | Rs. 4,000 to Rs. 9500 |
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Frequently Asked Questions
The potential risks associated with a kidney scan are minimal, as the procedure involves less radiation exposure than an X-ray. However, in rare cases, a patient may experience an allergic reaction during the scan.
Once the nuclear medicine technologist removes the IV, the patient can leave and resume their usual activities immediately. The radioactive material used during the scan is eliminated from the body through urine, and the patient should not experience any pain or discomfort related to the tracer.
The renal scan takes about 30 minutes to an hour.
Before a renal scan, patients can eat and drink regularly. However, the doctor may give you specific instructions depending on the situation.
A renal scan can be performed on children. The dose of radioactive material used, however, can be changed based on the child's age and weight.
No, a renal scan should not be done during pregnancy due to the use of radioactive material. Pregnant women should discuss alternative imaging options with their healthcare provider.
The cost of a renal scan typically ranges from Rs. 4,000 to Rs. 9500, depending on the diagnostic centers.
Yes, a renal scan can detect kidney stones, but it's not the primary imaging method for them. A renal scan, typically a nuclear medicine test like a DMSA or MAG3 scan, evaluates kidney function, blood flow, and structure.
