Understanding Your Complete Blood Count Test: Purpose, Procedure, and Why It's an Essential Part of Your Medical Care
This test measures creatinine levels in fluid collected over 24 hours from peritoneal dialysis to evaluate how well the dialysis is working.
{"Creatinine is a waste product that builds up when kidneys fail","This test measures how much creatinine is removed during peritoneal dialysis","Results help doctors determine if dialysis is adequate","A 24-hour collection provides accurate measurement of dialysis effectiveness","Abnormal results may indicate the need for treatment adjustments"}
Key facts at a glance
- LOINC
- 57726-2
- Short code
- CREA-PDF
- Synonyms
- Creat 24h DiafP-mCnc
- Category
- kidney
- Sample
- serum
- Container
- Sterile plastic container or specific peritoneal dialysis collection bag
- Units
- not specified
- Ref low
- 0
- Ref high
- 10
- Fasting
- false
- Population
- adult
- Sex
- all
- Age range
- 0–120 years
- Method
- Enzymatic or Jaffe rate spectrophotometric method
- CPT
- 82520
- SNOMED
- 260415003
- Specimen volume
- Aliquot of 10-20 mL from well-mixed 24-hour collection
- Stability
- Room temperature: 24 hours; Refrigerated (2-8°C): 7 days; Frozen (-20°C): 30 days
- Hemolysis max
- 500
- Lipemia max
- 1000
- Icterus max
- 500
- TAT
- 24–72 hours
- Order
- routine
This test is a routine blood draw that measures several important components of your blood, such as red and white blood cell counts, hemoglobin, and platelets. It helps your doctor assess your overall health and detect a wide range of disorders, including anemia, infection, and clotting problems.
The Creatinine in Peritoneal Dialysis Fluid test measures the amount of creatinine in the fluid used during peritoneal dialysis over a 24-hour period. Creatinine is a waste product that comes from normal muscle breakdown and is normally filtered out by healthy kidneys. When kidneys fail, creatinine builds up in the blood. This test helps determine how effectively peritoneal dialysis is removing this waste product from your body.
The test is performed by a healthcare professional who cleans a small area of your arm, usually near the elbow, and inserts a thin needle to collect a sample of blood into a vial. The procedure takes only a few minutes, and you may feel a brief pinch. The sample is then sent to a laboratory for analysis.
During peritoneal dialysis, a special solution (dialysate) is introduced into your abdominal cavity through a catheter. This solution absorbs waste products from your blood and is then drained out. For this test, you will collect all the drained fluid over a 24-hour period in a provided container. The laboratory will then analyze the creatinine content in this collected fluid to calculate how much waste was removed during dialysis.
This test is important because it provides your doctor with a snapshot of your blood makeup, allowing early detection of conditions that might otherwise go unnoticed. Regular testing can help monitor chronic conditions, evaluate symptoms, and guide treatment decisions, ultimately contributing to better long-term health outcomes.
This test is crucial for assessing the effectiveness of your peritoneal dialysis treatment. It helps your healthcare team understand if your dialysis prescription is adequate for removing waste products from your body. Regular monitoring ensures that you are receiving the right amount of dialysis to maintain your health and prevent complications from toxin buildup.
Reference range
Normal: <10 ng/mLnot specified
Collect entire 24-hour peritoneal dialysis effluent; mix thoroughly and measure total volume before aliquotting. No fasting or special patient preparation required.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
The creatinine measurement in peritoneal dialysis fluid is used to calculate dialysis adequacy, specifically the creatinine clearance rate. Higher creatinine removal indicates more effective dialysis. This information helps doctors adjust your dialysis prescription, including the number of exchanges, dwell times, or dialysate solution concentration. Inadequate creatinine clearance may lead to complications such as fluid overload, electrolyte imbalances, and buildup of uremic toxins, which can cause fatigue, nausea, and organ damage.
Frequently asked questions
Do I need to fast before this test?
What happens if my test results show low creatinine removal?
How often should this test be performed?
Is this test painful?
Can I do my normal activities during the 24-hour collection?
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