Urea, Post Dialysis Test: Booking, Price, and Results
About Urea, Post Dialysis Test: Booking, Price, and Results
| Field | Value |
|---|---|
| Also Known As | Blood Urea Nitrogen Post Dialysis, BUN Post Dialysis, Post-HD Urea, Post-Haemodialysis BUN |
| Sample Type | Serum (venous blood) |
| Fasting Required | No fasting required |
| Report Time | Within 1 day |
| Recommended For | Adults on haemodialysis (all genders) |
| Price | Starting at ₹180 |
What is a Urea, Post Dialysis Test?
The Urea Post Dialysis Test measures the level of urea remaining in the blood after a haemodialysis session. Urea is a waste product formed when the body breaks down protein. In patients with kidney failure, dialysis removes this waste from the blood. This test helps doctors assess whether the dialysis treatment is working as intended. It is also known as the BUN Post Dialysis or Post-Haemodialysis BUN test.
What Does a Urea, Post Dialysis Test Measure?
This test analyses urea levels in the blood after dialysis. The results are used alongside pre-dialysis values to calculate how effectively the session removed waste. The key parameters are listed below:
| Parameter | What It Tells Us |
|---|---|
| Post-dialysis BUN | The amount of blood urea nitrogen remaining after the dialysis session |
| Urea Reduction Ratio (URR) | A percentage that shows how much urea was removed during dialysis |
| Kt/V | A calculated value reflecting the overall dose of dialysis delivered |
Why is a Urea, Post Dialysis Test Done?
This test is ordered specifically for patients receiving haemodialysis. It is central to monitoring whether treatment is clearing waste products to a safe level.
Common Symptoms That May Require This Test
Patients on dialysis may need this test more frequently if they experience any of the following symptoms:
- Persistent fatigue and weakness
- Poor or disturbed sleep
- Loss of appetite
- Nausea or stomach discomfort
- Swelling in the ankles or feet
- Difficulty breathing
- Difficulty concentrating
Conditions This Test Can Help Detect
Doctors use this test to identify or confirm the following conditions and situations:
- Dialysis inadequacy, where treatment is not clearing enough waste from the blood
- Uraemia (the build-up of toxins in the blood due to insufficient waste removal)
- Uraemic encephalopathy, a brain dysfunction caused by toxin accumulation
- Vascular access problems, such as fistula or catheter dysfunction, that reduce dialysis efficiency
Urea, Post Dialysis Test for Chronic Disease Monitoring
This test is a routine monitoring tool for patients with end-stage renal disease (ESRD). Pre- and post-dialysis urea testing is recommended at least every six weeks for adults, and every four weeks for children on haemodialysis. Clinical guidelines recommend measuring dialysis dose at least monthly. Regular testing helps the care team adjust the treatment plan to ensure each session is delivering adequate clearance.
How to Prepare and What to Expect
No special preparation is needed before this test. The sample is collected at the end of your dialysis session, following the correct protocol.
Do You Need to Fast?
No, fasting is not required for this test. The blood sample is drawn immediately after your dialysis session ends. If other tests have been ordered at the same time, fasting may be required for those; please check with your doctor.
Practical Tips Before Your Test
Here are a few simple steps to ensure the test goes smoothly:
- Bring a detailed clinical history, including your symptoms, previous test results, and treatment records, as this is required for the test.
- Inform your doctor or dialysis nurse about all medications you are currently taking.
- Attend your full, prescribed dialysis session before the sample is collected.
- Do not leave the dialysis unit before the post-dialysis sample has been drawn.
Step-by-Step Procedure
The blood sample for this test is collected at the dialysis centre, immediately at the end of your session:
- Your dialysis session is completed as prescribed. Do not end the session early, as timing directly affects the result.
- Before the rinse-back procedure begins, the ultrafiltration rate is set to zero, and the blood pump is slowed down briefly.
- The blood pump is then stopped, and a small blood sample is drawn from the arterial blood line sampling port.
- The sample is placed in a yellow-top SST gel tube, labelled, and stored under refrigeration.
- The sample is dispatched to the laboratory for analysis using the spectrophotometry method.
- Your report is typically ready within one day.
Factors That Can Affect Accuracy
Several factors can influence the reliability of the test result. Your care team will be aware of these when reviewing your report:
- Drawing the sample immediately after dialysis, without the brief slow-down step, can dilute the result, yielding a falsely low urea reading.
- Access recirculation at the dialysis site can affect urea concentration in the sample.
- Low blood pressure during dialysis, access type (fistula vs. catheter), and gender can influence how quickly urea rebounds after the session.
- Incomplete or shortened dialysis sessions reduce the amount of urea cleared.
Understanding Your Urea, Post Dialysis Test Results
Your results should always be reviewed by your nephrologist alongside your pre-dialysis urea level and other clinical information. The table below shows general reference values used in clinical practice:
| Parameter | Target or Normal Range | Unit |
|---|---|---|
| BUN (general population) | 5 to 20 | mg/dL |
| Post-dialysis BUN (dialysis patients) | Approximately 15 | mg/dL |
| Urea Reduction Ratio (URR) | Greater than 65% (minimum); greater than 70% (target) | % |
| Kt/V | 1.4 (minimum 1.2) | — |
These ranges are general guidelines. Your doctor will interpret your results based on your age, health history, and other factors. Always consult a qualified healthcare professional for personalised medical advice.
Results During Special Conditions
Urea levels can be affected by certain physiological effects that occur during and after dialysis:
Immediately after dialysis stops, recirculated blood near the access site can dilute the sample and give a falsely low urea value. This effect clears within a few minutes. A further, slower rise in urea (called urea rebound) occurs over 30 to 45 minutes as urea moves from body tissues back into the bloodstream. More efficient dialysis sessions tend to produce a greater rebound effect.
How to Maintain Healthy Levels
The following tips can support better dialysis outcomes over time:
- Attend every scheduled dialysis session and stay for the full prescribed treatment time. Missed or shortened sessions directly affect urea clearance.
- Follow the dietary guidance given by your renal dietitian, particularly regarding protein intake, as dietary protein is the primary source of urea.
- Keep a record of your monthly URR results and discuss any downward trend with your nephrologist at your next appointment.
Lupin Diagnostics Urea, Post Dialysis Test Price and Home Collection
The Urea Post Dialysis Test at Lupin Diagnostics is priced starting at ₹180, and home sample collection is available across many cities. City-wise prices are listed below:
| City | Approximate Price (₹) |
|---|---|
| BHOPAL | 180 |
| CHENNAI | 180 |
| HYDERABAD | 180 |
| KOLKATA | 150 |
| NAVI MUMBAI | 180 |
| PUNE | 150 |
Prices are indicative and may vary by location. Please confirm the current price at the time of booking.
How to Book
Follow these steps to complete your booking:
- Select the Urea Post Dialysis Test on the Lupin Diagnostics website.
- Choose your city and preferred time slot.
- Opt for home sample collection by a certified phlebotomist, or visit your nearest Lupin Diagnostics centre.
- Receive your report via email or WhatsApp within the stipulated turnaround time.
Home Collection
Lupin Diagnostics offers home sample collection for this test across multiple cities. All samples are processed in NABL-accredited laboratories by trained professionals. Your digital report is delivered directly to you via email or WhatsApp, making it easy to share with your care team.
Frequently Asked Questions
This test measures the urea remaining in the blood after a haemodialysis session. It helps doctors determine whether the dialysis treatment removed enough waste from the blood. The results guide decisions about adjusting dialysis frequency, duration, or technique.
The URR is calculated by subtracting the post-dialysis urea value from the pre-dialysis value, dividing the result by the pre-dialysis value, and multiplying by 100. The result is expressed as a percentage. A higher percentage indicates more effective waste removal.
Clinical guidelines recommend a URR of at least 65% for patients receiving haemodialysis three times per week. A target of above 70% is considered optimal. Results below 65% suggest that dialysis may need to be reviewed.
For most adults on haemodialysis, pre- and post-dialysis urea testing is recommended at least every six weeks. Children on dialysis should be tested at least every four weeks. Your nephrologist may advise more frequent testing depending on your condition.
If the blood sample is drawn at the wrong point in the shutdown process, recirculated blood near the access site can dilute the sample. This leads to a falsely low urea reading and may make dialysis appear more effective than it actually was. Following the correct slow-down protocol before sampling is essential.
No, fasting is not required. The sample is taken at the end of your dialysis session, with no dietary preparation needed. If your doctor has ordered additional tests on the same blood draw, you may need to check whether fasting is required for those.
Urea, Post Dialysis Test: Booking, Price, and Results
