Understanding Your Diagnostic Test: Purpose, Procedure, and Results
This test measures the amount of creatinine in your peritoneal dialysis fluid over 24 hours to evaluate dialysis effectiveness.
{"Measures creatinine cleared through peritoneal dialysis","Helps assess if dialysis is removing enough waste from your blood","Used to monitor kidney replacement therapy adequacy","Involves collecting all dialysis fluid over 24 hours","Results help doctors adjust your dialysis treatment plan"}
Key facts at a glance
- LOINC
- 39471-8
- Short code
- CRPD24
- Synonyms
- Creat 24h DiafP-sCnc
- Category
- kidney
- Sample
- serum
- Container
- Sterile collection container or dialysis bag
- Units
- not specified
- Ref low
- 0
- Ref high
- 15
- Fasting
- false
- Population
- adult
- Sex
- all
- Age range
- 0–120 years
- Method
- Enzymatic or Jaffe kinetic method
- CPT
- 82520
- SNOMED
- 11301006
- Specimen volume
- Entire 24-hour peritoneal dialysis effluent volume, typically 8-12 liters
- Stability
- Room temperature: 7 days; Refrigerated (2-8°C): 14 days; Frozen (-20°C): 30 days
- Hemolysis max
- 500
- Lipemia max
- 1000
- Icterus max
- 500
- TAT
- 24–72 hours
- Order
- routine
What is this test? This diagnostic test evaluates a specific aspect of your health, such as how an organ works, whether an infection is present, or whether another medical condition may need attention.
The 24-hour peritoneal dialysis fluid creatinine test measures how much creatinine (a waste product from muscle metabolism) is removed from your body through peritoneal dialysis over a 24-hour period. Creatinine is normally filtered out by healthy kidneys, and when kidney function declines, it builds up in the blood. This test helps doctors see how effectively your peritoneal dialysis is replacing your kidney function.
Why is this test performed? Your healthcare professional may recommend it to investigate symptoms, confirm or rule out a possible diagnosis, monitor an existing condition, assess treatment, or support routine preventive care.
This test is performed to evaluate the adequacy of your peritoneal dialysis treatment. By measuring the creatinine in the collected dialysis fluid, your healthcare team can determine if your dialysis prescription is effectively removing waste products from your blood. Regular monitoring helps ensure you are receiving sufficient dialysis to maintain your health and quality of life.
How is the test done? Depending on the type of test, a healthcare professional may collect a blood, urine, or other sample, perform an examination, or use specialized equipment to obtain images or measurements safely.
You will be instructed to collect all of your peritoneal dialysis fluid over a 24-hour period in a special container provided by your healthcare facility. Keep the container refrigerated or in a cool place as directed. After the collection period, bring the complete sample to your dialysis center or laboratory as instructed. It's important to record the total volume of dialysis fluid used during the collection period.
Understanding your results: Your results should be interpreted with your symptoms, medical history, medications, and other findings. Ask your healthcare professional to explain what they mean and whether follow-up testing or treatment is needed.
Your test results will show the total amount of creatinine removed through dialysis over 24 hours, along with the creatinine clearance rate. Higher creatinine clearance generally indicates better dialysis adequacy. Your healthcare provider will interpret these results based on your individual situation, body size, and overall health status.
Reference range
No established reference rangenot specified
Collect entire 24-hour peritoneal dialysis effluent volume; mix thoroughly and record total volume prior to aliquotting
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
This test is crucial for assessing peritoneal dialysis adequacy. Low creatinine clearance suggests inadequate dialysis, which may require adjustment of your treatment parameters such as longer dwell times, different dialysis solution concentrations, or increased exchange frequency. Adequate dialysis is essential for removing waste products, maintaining fluid balance, and preventing complications of kidney failure.
Regular monitoring of peritoneal dialysis fluid creatinine helps track changes in your dialysis effectiveness over time. It also helps identify potential problems with your peritoneal membrane (the lining that acts as the filter) that might affect dialysis efficiency. Results are often combined with other tests like blood urea nitrogen (BUN) measurements to get a complete picture of your dialysis adequacy.
Frequently asked questions
Does this test hurt?
How often do I need this test?
What if my results show inadequate dialysis?
Do I need to fast before this test?
Sources
- 1
- 2
- 3
Click any link to access the full source. PubMed Central (PMC) links provide free full-text access.
This information is for educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment.
This content is for general informational and educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the guidance of a qualified healthcare provider with any questions you have about a medical condition, and never disregard professional medical advice or delay seeking it because of something you read here.
If you think you may have a medical emergency, call your local emergency number or go to the nearest emergency department immediately.
Medically reviewed by WellAlly Editorial Team Last reviewed August 16, 2026. · Read our editorial policy