Alkaline Phosphatase (ALP)
- Sample Type
- Standard
- Fasting
- No
- Unit
- U/L
Alkaline Phosphatase (ALP) is a hydrolase enzyme found primarily in the liver (lining of the biliary ducts) and bone. Within a Liver Function Test Without GGT, ALP serves as a primary indicator of cholestasis (bile flow obstruction). When bile ducts are damaged or obstructed, ALP is induced and spills into the bloodstream. It is also crucial for identifying infiltrative liver diseases like sarcoidosis or certain malignancies. However, because it is also produced by osteoblasts, its significance in this panel is to differentiate between hepatobiliary origin and bone turnover.
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Why Context Matters
ALP is highly sensitive but not specific to the liver. It can be elevated due to physiological bone growth in adolescents, pregnancy (placental ALP), or bone disorders (Paget's disease, healing fractures). Without GGT testing, it is difficult to confirm if the elevation is purely hepatic.
Lab ranges are statistical averages, not biological laws. "Normal" for a 20-year-old male isn't normal for a 60-year-old female.
Clinical References
Source-of-truth databases and clinical guidelines for Alkaline Phosphatase (ALP):
Official Sources
Research & Guidelines
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Medically Reviewed by Dr. Binoy Babu, MBBS
Board Certified Doctor • 10+ Years Clinical Experience
Dr. Babu is a practicing physician dedicated to empowering patients with clear, actionable medical information. He founded 2opi to bridge the gap between complex lab reports and patient understanding, ensuring everyone has access to a reliable second opinion.
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