About the Test:
An alkaline phosphatase level test (ALP test) measures the amount of alkaline phosphatase enzyme in your bloodstream.
Abnormal levels of ALP in your blood most often indicate a problem with your liver, gallbladder, or bones. Abnormal levels of ALP in your blood most often indicate a problem with your liver, gallbladder, or bones. However, they may also indicate malnutrition, kidney cancer tumors, intestinal issues, a pancreas problem, or a serious infection.
The test requires a simple blood draw and is often a routine part of other blood tests. You may have to limit food and liquids for several hours before the test. Some medicines interfere with the results, so make sure your doctor knows about all the drugs you take, including over-the-counter medicines, vitamins, and supplements. Be sure to let your doctor know if you are pregnant because that will increase the level of ALP in your blood.
It generally takes 1-2 days for results to come back from the lab. Higher-than-normal ALP levels for your age and sex may not necessarily mean you have a problem. (Children and teens naturally have higher levels than adults because their bones are still developing). If your ALP level is high, your doctor may have you take another test, called an ALP isoenzyme test, to determine whether the alkaline phosphatase in your blood is coming from your liver or your bones.