The amounts of different types of ALP in the blood may be measured and used to determine whether a high level is from the liver or bones.
This is called an alkaline phosphatase isoenzymes test.
If you are having a follow-up ALP test, you may be asked to not eat or drink for 10 hours before the test.
The ALP level generally goes up after eating, especially after eating fatty foods.
Talk to your doctor about any concerns you have regarding the need for the test, its risks, how it will be done, or what the results will mean. You may feel nothing at all from the needle, or you may feel a quick sting or pinch. The normal values listed here—called a reference range—are just a guide.
The liver makes more ALP than the other organs or the bones.Some conditions cause large amounts of ALP in the blood.