: Phosphate [Substance Concentration] in Urine
: This test measures the amount of phosphate in your urine. Urine phosphate can help evaluate how your kidneys handle minerals and acid-base balance, especially when interpreted alongside blood tests.
[": The result helps your clinician assess phosphate excretion and kidney function, but it must be interpreted with your other laboratory findings."]
Key facts at a glance
- LOINC
- 80611-7
- Short code
- Phosphate ?Tm Ur-sCnc
- Synonyms
- Phosphate ?Tm Ur-sCnc
- Category
- electrolyte
- Sample
- urine
- Container
- Sterile urine container
- 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
- 10 mL
- Stability
- Room temperature: 2h, Refrigerated: 24h, Frozen: 7d
- Hemolysis max
- 0
- Lipemia max
- 0
- Icterus max
- 0
- TAT
- 4–24 hours
- Order
- routine
: What This Test Measures
: The test measures phosphate, a mineral used for bone health, energy metabolism, and cellular signaling. A urine sample can show how much phosphate your body is releasing.
: How the Test Is Performed
: A urine sample is collected and analyzed in the laboratory. Your clinician may request a single sample or a collection over a specified period, such as 24 hours.
: Why Your Doctor May Order It
: Urine phosphate may be checked when evaluating kidney disease, calcium or phosphate disorders, bone abnormalities, or changes in blood and urine acidity. It is often interpreted with blood phosphate, calcium, kidney function, and vitamin D results.
: Factors That May Affect the Result
: Dietary intake, vitamin D status, kidney function, bone conditions, hydration, and certain medicines can influence urinary phosphate. Following any preparation instructions from your clinician helps improve result accuracy.
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.
: Urine phosphate results can help identify increased or decreased phosphate loss and contribute to assessments of mineral metabolism and acid-base balance. An abnormal value does not establish a diagnosis by itself and should be reviewed with your clinician.
Short name
: Urine Phosphate
Frequently asked questions
: Does a low urine phosphate result always mean a health problem?
: Why might a 24-hour urine collection be requested?
: How is urine phosphate different from blood phosphate?
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