Alkaline Phosphatase levels: what's normal, high and low
An enzyme present in liver, bone, and bile ducts. Used to evaluate liver and bone health.
Medically reviewed by Youmna DiStefano, MD · Last reviewed September 2026
The short answer
Alkaline Phosphatase is measured with a standard blood draw after an 8–12 hour fast. A typical reference range is 40.0 – 129 U/L. At TestWell it's $22.99 all-in as Comprehensive Metabolic Panel, results in 1–3 business days, drawn at Quest or Labcorp. An out-of-range result is a prompt to look closer, not a diagnosis.
- Units
- U/L / IU/L
- Sample
- Blood draw
- Fasting
- 8–12 hours
- Results
- 1–3 business days
- Price
- $22.99
- Labs
- Quest or Labcorp · BioReference in NY/NJ
Alkaline Phosphatase Reference Range
These are the typical adult reference ranges used by major US labs. Your report will include the specific range used by the lab that processed your sample.
| Population | Range |
|---|---|
| age 18+ | 40.0 – 129 U/L |
Reference ranges are educational. Always interpret your result with the specific range printed on your lab report and discuss anything outside the range with a clinician.
What your Alkaline Phosphatase result may mean
Often reflects bile-flow problems, liver disease, or bone turnover (including normal growth in adolescents).
What a high Alkaline Phosphatase means: causes, symptoms, next steps →Can reflect malnutrition, low zinc, or rare genetic conditions.
Educational only — not a diagnosis. Many factors can influence a single result. Discuss anything that concerns you with a healthcare provider.
How do you get a Alkaline Phosphatase test?
Order online, a licensed physician reviews the requisition, and you walk into a nearby lab for the draw. Alkaline Phosphatase is available on its own or inside these panels — panels cost less per marker when you want the fuller picture.
| Option | Includes | Price |
|---|---|---|
| Comprehensive Metabolic Panel | This marker only | $22.99 |
| Gout Panel | 3 tests | $62.99 |
| Kidney Health Panel | 4 tests | $64.99 |
| General Wellness Panel | 4 tests | $89.99 |
| Post-COVID Recovery Panel | 7 tests | $99.99 |
Quest vs. Labcorp for Alkaline Phosphatase: which lab should you pick?
Both are CLIA-certified national labs and the result is clinically equivalent, so pick whichever location is closer. Your report will print that lab's own reference range, which can differ slightly from the table above.
| Lab | Available | Price |
|---|---|---|
| Quest Diagnostics | Yes | $22.99 |
| Labcorp | Yes | $22.99 |
| BioReference (NY & NJ) | Yes | $25.99 |
Need help choosing a location? Use the lab finder to see draw sites near your ZIP.
Frequently asked
Often reflects bile-flow problems, liver disease, or bone turnover (including normal growth in adolescents). A single result above the reference range is a prompt to look closer with a clinician — often a repeat test and related markers — not a diagnosis on its own.
Ready to test your alkaline phosphatase?
Order in two minutes, get physician-approved, and visit a lab the same day. Starts at $22.99.