Liver Kidney Microsomal Antibody
Does this test have other names?
Antibodies to liver and kidney microsomes, anti-LKM
What is this test?
This test looks for a certain type of antibody in your child's blood. The antibody
is called liver kidney microsomal antibody. Having this antibody may mean that your
child has liver damage caused by a form of hepatitis.
Hepatitis is a condition in which the liver is inflamed. Some types of hepatitis are
caused by a hepatitis virus. But this test checks for antibodies to a type of autoimmune
hepatitis. If your child has autoimmune hepatitis, his or her immune system attacks
Autoimmune hepatitis can be either type 1 or type 2. Type 1 can affect anyone but
is most common in young women. About half of people with type 1 autoimmune hepatitis
have another autoimmune disease, such as type 1 diabetes or ulcerative colitis. Adults
can develop type 2 autoimmune hepatitis. But it's most common in girls ages 2 to 14.
People with type 2 autoimmune hepatitis make liver kidney microsomal antibodies. These
are different from the antibodies found in type 1 disease.
Why does my child need this test?
Your child may need this test if the healthcare provider thinks that he or she has
autoimmune hepatitis. Or your child may need the test to check for other liver or
metabolic conditions. Signs and symptoms of autoimmune hepatitis include:
Yellowish skin and eyes (jaundice)
Itching, sometimes over the whole body
Lack of appetite
Nausea, vomiting, or both
Belly (abdominal) pain or discomfort
Broken blood vessels on the skin, often in a "spider" shape
Signs of advanced autoimmune hepatitis are:
Fluid in the abdomen
Your child may also have this test to check for diseases that are like an autoimmune
What other tests might my child have along with this test?
Your child may also need a group of tests known as a liver panel. These tests help
check how well your child's liver is working. They check for liver damage and inflammation.
He or she may also need other tests for autoantibodies. And your child may need a
liver biopsy. This is done by taking a tiny sample of your child's liver to check
in a lab.
What do my child's test results mean?
Many things may affect your child's lab test results. These include the method each
lab uses to do the test. Even if your child's test results are different from the
normal value, he or she may not have a problem. To learn what the results mean for
your child, talk with your child's healthcare provider.
Negative results mean that no antibodies were found and it's unlikely that your child
has type 2 autoimmune liver disease. But your child may still be positive for other
antibodies seen with type 2 autoimmune liver disease. Your will need more testing
for these antibodies.
If your child's results are positive, it means that antibodies were found. Your child
may have autoimmune liver disease.
How is this test done?
The test is done with a blood sample. A needle is used to draw blood from a vein in
your child’s arm or hand.
Does this test pose any risks?
Having a blood test with a needle carries some risks. These include bleeding, infection,
bruising, and feeling lightheaded. When the needle pricks your child’s arm or hand,
he or she may feel a slight sting or pain. Afterward, the site may be sore.
What might affect my child's test results?
You don’t need to do anything to get your child ready for this test.
How do I get my child ready for this test?
Your child doesn't need to prepare for this test.