Alkaline Phosphatase (ALP)
Enzyme from liver, bile ducts, and bone. Elevated in bile duct obstruction and bone disorders.
Typical normal range
44–147 U/L
If high ↑
Bile duct obstruction, bone disease, liver disease, Paget's disease
If low ↓
Hypothyroidism, pernicious anemia, zinc deficiency
What is a normal Alkaline Phosphatase level?
A typical reference range is 44–147 U/L. Ranges vary between laboratories and can depend on age and sex, so compare your result with the range printed on your own report.
What does a high Alkaline Phosphatase level mean?
Bile duct obstruction, bone disease, liver disease, Paget's disease. A single result rarely gives a diagnosis on its own; your doctor will interpret it alongside your symptoms and other tests.
What does a low Alkaline Phosphatase level mean?
Hypothyroidism, pernicious anemia, zinc deficiency. Your doctor will interpret it alongside your symptoms and other tests.
About the Liver Panel
Liver tests measure enzymes and proteins made by the liver. Raised levels can point to inflammation or damage, and they are often checked when starting certain medicines.
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Medical disclaimer: Reference ranges vary by laboratory, age, sex, and clinical context. This page is for educational purposes only and is not a diagnosis. Always discuss your results with a qualified healthcare professional.