ALP - blood test

What is ALP Blood Test?

The ALP Blood Test or Alkaline Phosphatase test measures the amount of ALP enzyme in the blood. This enzyme is found primarily in the liver, bone, and bile ducts. Higher levels of ALP can indicate a problem with these organs or their associated structures.


Generally, the ALP test does not require any special preparation or fasting. Your doctor may suggest otherwise, depending on your specific health condition.


The ALP test is a simple blood draw. The blood sample is sent to a laboratory where the amount of ALP enzymes is measured. Results are usually available within a few days.

Types of ALP Test

There are two primary types of ALP tests:

  • Total ALP Test
  • Isoenzymes Test

The Total ALP Test is used to measure the overall amount of ALP in the body. The Isoenzymes Test measures the ratio of different types of ALP enzymes that are present.

Risks and Side Effects

The ALP blood test is a low-risk procedure. The most common risks are from the needle stick used to draw the blood, which may cause minor discomfort. Rarely, infection or excessive bleeding can occur.

Why is ALP Blood Test Done?

The ALP blood test is generally done to detect a liver condition, such as hepatitis, cirrhosis, or gallbladder inflammation. It may also be used to monitor the effectiveness of treatments for liver and bone diseases. The ALP test can be used to monitor disorders of blood cells, such as leukemia or thalassemia.

When is ALP Blood Test Done?

Your doctor may request an ALP test if you have symptoms of liver or bone disease, such as pain or tenderness in your belly or flanks, jaundice (yellowing of the skin or eyes), fatigue, or weakness. Your doctor may also request an ALP if you are taking medications known to affect the liver, such as certain antibiotics, anticonvulsants, or anti-inflammatory drugs.