An enzyme test that helps check liver bile flow and bone activity.
Alkaline phosphatase (ALP) is an enzyme found mainly in the liver, the bile ducts, and bone. Smaller amounts come from the gut and, in pregnancy, the placenta.
Because it has more than one source, ALP is read with other markers to work out whether a raised level is coming from the liver or from bone.
A high ALP from the liver usually means bile flow is blocked or slowed, a pattern called cholestasis. From bone, it can reflect rapid bone turnover, healing fractures, or vitamin D deficiency.
A low ALP is less common and can relate to malnutrition, low zinc, or a rare inherited condition. GGT helps tell the liver and bone sources apart.
Aniva reads your result against research-backed ranges, not just the lab's wide normal. The reference shown below is specific to this biomarker.
| Group | Serum ALP (SI) |
| Adults | ~35 to 105 U/L |
| Note | higher in children, teens, and pregnancy |
Ranges are guidance only and vary by lab, assay, age, and pregnancy. Growing children and adolescents have much higher levels. Read your result against your own lab's reference interval, in line with DGKL practice.
Levels are naturally higher during growth and in pregnancy. A recent fatty meal can raise the intestinal form, so a fasting sample is sometimes preferred. Bone healing and some medicines affect it. Read with GGT to find the source.
Best read with GGT (to confirm a liver source), bilirubin, and ALT, and with calcium, phosphate, and vitamin D when a bone source is suspected.
What does an ALP result mean? It shows activity from the liver and bones. High or low results need context from other tests to find the source.
Do I need to fast for this test? No. Fasting is not required for an ALP blood test.
What can affect my ALP level? Pregnancy, growth in teens, recent fractures, heavy exercise, alcohol, and some medicines can change results. A very fatty meal may cause a small rise.
How often should I test ALP? Test as your clinician advises, such as when symptoms appear, to monitor a condition, or to track a medicine’s effects.
How quickly are results ready? Results are usually ready in about 7 days.
What should I discuss with my clinician if ALP is high? Share symptoms, medicines, alcohol use, and pregnancy status. Ask whether follow-up tests like GGT or ALP isoenzymes are needed.
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