Alkaline phosphatase (ALP) blood test
Quick answer: An ALP test measures an enzyme found mainly in the liver and bones. It is part of liver function tests and helps check for liver, bile duct or bone problems.
- SampleBlood
- TakesAbout 5 minutes
- Before the testNo special preparation is usually needed.
- In fertility careALP normally rises in later pregnancy because the placenta makes it, so results are read with that in mind.
How the test is done
- 1You sit with your arm resting on a support
- 2A band is tied and the skin is cleaned
- 3A needle draws blood into a tube
- 4The ALP level is measured, often with other liver tests
What your results can mean
Reading your report
Normal ranges differ between labs and by age and sex, so discuss your result with your doctor.
If the result is outside the usual range
A high level can be seen with blocked bile ducts, liver disease, bone conditions, healing fractures, growth in children and late pregnancy. A low level is uncommon and can be seen with poor nutrition or rare bone conditions.
Who usually has this test
People having liver function tests, and people with bone pain, fractures or suspected bone disease.
Risks and aftercare
Bruising at the needle site is the only usual effect.
Names and options
Also called: ALP, alk phos
Listed by the hospital as
- ALKALINE PHOSPHATASE, SERUM
Questions about this test
How do doctors tell whether high ALP is from the liver or bone?
They often check GGT at the same time. If GGT is also high, the liver is the likely source; if GGT is normal, bone is more likely.
Is high ALP normal in pregnancy?
Yes. The placenta makes ALP, so levels rise in the second half of pregnancy. Your doctor will take this into account.
Why is ALP higher in children?
Growing bones release ALP, so children and teenagers naturally have higher levels than adults.
Related tests
Tamara Hospital & IVF Centre, Rajajinagar
34/3, 10th Cross Road, opp. Vardhaka Sardar Patel School, 1st N Block, 2nd Stage, Rajajinagar, Bengaluru 560010
The hospital is open 24 hours. Call before you come to check the timing for your scan or sample collection.
Get directions ↗IVF Pulse fertility care at Tamara Hospital →
Reception
Waiting area
IVF lab
This page explains each test in general terms so you know what to expect. It is not medical advice: your doctor decides which tests you need and what your results mean. Reference ranges differ between laboratories. Updated 4 November 2026.