: Phosphate [Mass concentration] in Dialysate fluid by Method not specified
: This test measures the mass concentration of phosphate in a sample of dialysate fluid, the solution used during dialysis to help remove waste products from the blood.
[": Measuring phosphate in dialysate helps assess how much phosphate is being removed during a dialysis session."]
Key facts at a glance
- LOINC
- 2775-5
- Short code
- Phosphate Dial fld-mCnc
- Synonyms
- Phosphate Dial fld-mCnc
- Category
- electrolyte
- Sample
- serum
- Container
- Red-top tube (SST)
- Units
- N/A
- Ref low
- 2.5
- Ref high
- 4.5
- Critical range
- 1 N/A – —
- Fasting
- false
- Population
- adult
- Sex
- all
- Age range
- 18–65 years
- CPT
- 84100
- Specimen volume
- 5 mL
- Stability
- Room temperature: 4h, Refrigerated: 24h, Frozen: 7d
- Hemolysis max
- 500
- Lipemia max
- 1000
- Icterus max
- 500
- TAT
- 4–24 hours
- Order
- routine
: What Is Being Measured
: Phosphate is a mineral that is normally filtered by healthy kidneys. In people with kidney failure, phosphate can build up in the blood, so it is important to track how well dialysis is removing it. This test measures the amount of phosphate present in the dialysate fluid itself.
: Why the Test Is Used
: Your care team may order this test to evaluate the dialysis prescription and confirm that phosphate is being cleared as expected. It can help guide adjustments to the dialysis treatment so that waste removal stays on target.
: How the Sample Is Collected
: A small sample of the dialysate fluid is collected, typically during or after a dialysis session, depending on your clinic's protocol. The sample is then sent to the laboratory for analysis. Your care team will explain exactly when and how the sample will be obtained.
: What the Results Mean
: Results are interpreted by your care team in the context of your overall dialysis plan and blood test results. A single value is rarely meaningful on its own, so trends over time and comparison with your other laboratory results are typically used to guide decisions. Ask your care team to explain what your specific results mean for your treatment.
Reference range
Adult: 2.5-4.5 mg/dLN/A
No special preparation usually required. Stay well hydrated. Inform your healthcare provider of all medications and supplements you are taking.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
: Phosphate clearance during dialysis is an important part of managing mineral balance in people with kidney failure. Measuring phosphate in dialysate can support quality assessment of the dialysis session and help the care team tailor the treatment prescription. It is generally used alongside blood phosphate measurements and other monitoring rather than as a stand-alone test.
Short name
: Dialysate Phosphate
Frequently asked questions
: Is this the same as a blood phosphate test?
: Does this test require fasting?
: Will this test tell me if my dialysis is working well?
Sources
- 1
- 2Lab Tests OnlineSource
- 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 17, 2026. · Read our editorial policy