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S. Alkaline Phosphatase (ALP) Test
Serum Alkaline Phosphatase (ALP) is a blood test that measures the level of the enzyme alkaline phosphatase in your blood.
What is it used for?
ALP is found mainly in the liver, bile ducts, and bones. The test may help doctors evaluate:
Liver or bile-duct problems, such as blockage or cholestasis
Bone disorders or increased bone turnover
Certain vitamin/mineral deficiencies or other conditions
Typical reference range
For adults, ALP is often roughly 40–130 U/L, but the normal range varies by laboratory, age, and sex. Always compare your result with the reference range printed on your report.
If ALP is high
Possible causes include bile-duct obstruction, liver disease, gallbladder problems, bone disease, healing fractures, and sometimes normal physiological changes.
If ALP is low
Less commonly, low ALP can be associated with nutritional deficiencies, hypothyroidism, certain medications, or rare metabolic conditions.
If you share your ALP value (U/L), the lab's reference range, your age, and whether other tests such as ALT, AST, bilirubin or GGT were reported, I can explain what your result may mean.
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