|Fasting or Non-fasting||Fasting. You should not eat or drink anything for 6 hours before the test.|
|Turnaround Time for Results|
The alkaline phosphatase (ALP) test measures the level of an enzyme called alkaline phosphatase in the blood. ALP is present in all body tissues but its levels are the highest in the liver, bile ducts and bones. The ALP test is often done to diagnose or monitor liver, biliary or bone conditions.
The ALP test is a simple blood test collected via venipuncture. The results are reported as units per liter (U/L). Normal blood ALP levels vary from 44 to 147 U/L.
Higher than normal ALP levels in blood can result from:
- Biliary obstruction
- Bone conditions or tumors
- Liver damage or disease (such as hepatitis)
- Paget disease
Lower than normal ALP levels in blood can result from:
- Wilson disease
- Malnutrition or protein deficiency
Am I required to fast for this test?
Yes, you should not eat or drink anything for 6 hours before the test.
What are normal levels?
Normal blood ALP levels vary from 44 to 147 units/L (or 0.73 to 2.45 microkat/L) in adult men and women. Levels are higher in adolescents and children1,2 The normal values can vary depending on the laboratory. The exact range will be indicated on your report.
What are abnormal levels?
Increased ALP levels in the blood usually indicate liver, biliary or bone condition.
Why do I need it?
If you suspect you might suffer from liver, bone or biliary condition, you may consider having this test done. The test may also be done to as a part of a routine liver function test.
What type of doctor should I see if results are abnormal?
See your primary health care provider who may refer you to a specialist, such as a gastroenterologist.