• Home

Home > Medical Reference > Encyclopedia (English)

Toggle: English / Spanish

ALP isoenzyme test

• Overview
• Risks
• Results

Definition:

Alkaline phosphatase (ALP) is a substance found in all body tissues. There are many different forms of ALP. Each type has a different chemical structure, called an isoenzyme -- its structure depends on where in the body it is produced. For example, liver and bone ALP isoenzymes look different.

The ALP isoenzyme test is a blood test that measures the amounts of different types of ALP.

See also: Alkaline phosphatase test

Alternative Names:

Alkaline phosphatase isoenzyme test

How the test is performed:

Blood is drawn from a vein, usually from the inside of the elbow or the back of the hand. The site is cleaned with germ-killing medicine (antiseptic). The health care provider wraps an elastic band around the upper arm to apply pressure to the area and make the vein swell with blood.

Next, the health care provider gently inserts a needle into the vein. The blood collects into an airtight vial or tube attached to the needle. The elastic band is removed from your arm.

Once the blood has been collected, the needle is removed, and the puncture site is covered to stop any bleeding.

In infants or young children, a sharp tool called a lancet may be used to puncture the skin and make it bleed. The blood collects into a small glass tube called a pipette, or onto a slide or test strip. A bandage may be placed over the area if there is any bleeding.

How to prepare for the test:

You should not to eat or drink anything for 10 to 12 hours before the test, unless otherwise instructed by your doctor.

Many drugs affect the level of alkaline phosphatase in the blood. Your health care provider may tell you to stop taking certain drugs before the test. Never stop taking any medicine without first talking to your doctor.

• Allopurinol
• Antibiotics
• Anti-inflammatory medicines
• Birth control pills
• Certain arthritis drugs
• Certain diabetes medicines
• Chlorpromazine
• Cortisone
• Male hormones
• Methyldopa
• Narcotic pain medicines
• Propranolol
• Tranquilizers
• Tricyclic antidepressants

How the test will feel:

When the needle is inserted to draw blood, some people feel moderate pain, while others feel only a prick or stinging sensation. Afterward, there may be some throbbing.

Why the test is performed:

This test may be used to diagnose:

• Liver disease
• Biliary disease (jaundice)
• Parathyroid disease
• Vitamin D deficiency
• The cause of pain in the upper abdomen
• Bone disease

It may also be done to check liver function and to see how medicines you take may affect your liver.

• Review Date: 5/17/2007
• Reviewed By: Benjamin W. Van Voorhees, MD, MPH, Assistant Professor of Medicine, Pediatrics and Psychiatry, The University of Chicago, Chicago, IL. Review provided by VeriMed Healthcare Network.

A.D.A.M., Inc. is accredited by URAC, also known as the American Accreditation HealthCare Commission (www.urac.org). URAC's accreditation program is the first of its kind, requiring compliance with 53 standards of quality and accountability, verified by independent audit. A.D.A.M. is among the first to achieve this important distinction for online health information and services. Learn more about A.D.A.M.'s editorial process . A.D.A.M. is also a founding member of Hi-Ethics (www.hiethics.com) and subscribes to the principles of the Health on the Net Foundation (www.hon.ch).

The information provided herein should not be used during any medical emergency or for the diagnosis or treatment of any medical condition. A licensed physician should be consulted for diagnosis and treatment of any and all medical conditions. Call 911 for all medical emergencies. Links to other sites are provided for information only -- they do not constitute endorsements of those other sites. Copyright 1997-2007 A.D.A.M., Inc. Any duplication or distribution of the information contained herein is strictly prohibited.