Alkaline Phosphatase, Urine — Calculated Result
This test measures alkaline phosphatase activity in urine and may provide a calculated result based on the laboratory's testing method.
["The result can help evaluate bone or liver-related enzyme activity, but urine collection and laboratory methods strongly affect interpretation."]
Key facts at a glance
- LOINC
- 107522-5
- Short code
- Alpha-PHP Ur Cfm
- Synonyms
- Alpha-PHP Ur Cfm
- Category
- liver
- Sample
- urine
- Container
- Sterile urine container
- Units
- N/A
- Ref low
- 44
- Ref high
- 147
- Fasting
- false
- Population
- adult
- Sex
- all
- Age range
- 18–65 years
- Method
- confirm
- CPT
- 84075
- SNOMED
- 27550007
- 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 is this test?
Alkaline phosphatase is an enzyme found in several body tissues, including bone, liver, and bile ducts. This urine test measures the amount of alkaline phosphatase activity in the urine sample.
Why might I need this test?
A urine alkaline phosphatase test may be ordered as part of an evaluation of bone metabolism, liver or biliary disease, or other conditions affecting enzyme levels. The calculated result may adjust the urine measurement for factors such as concentration or collection details.
How is the test performed?
You provide a urine sample in the container specified by the laboratory. The laboratory measures alkaline phosphatase activity using an enzyme-based method and may calculate a value from the urine concentration or other collection information.
How do I prepare for the test?
Follow the laboratory's urine-collection instructions, including whether a first-morning or timed sample is required. If a timed collection is requested, record the start and end times and bring the full specimen as directed.
Reference range
Adult: 44-147 U/LN/A
No special preparation required. Avoid fatty meals before the test if possible.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
Higher-than-expected urinary alkaline phosphatase activity may occur with increased bone turnover or with liver and biliary conditions that increase enzyme release. Lower-than-expected activity is less commonly used for diagnosis. Results should be interpreted with urine concentration, collection method, medications, and other blood test results because isolated urine values may be misleading.
Short name
Urine alkaline phosphatase
Frequently asked questions
Is this the same as a blood alkaline phosphatase test?
Why was a calculated result reported?
What can affect an urine alkaline phosphatase result?
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 16, 2026. · Read our editorial policy