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 means a condition in which your liver is inflamed. Some types of hepatitis
are caused by the hepatitis viruses, but this test checks for antibodies to a type
of autoimmune hepatitis. If you have autoimmune hepatitis, your 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, which
are different from the antibodies found in type 1 disease.
Why does my child need this test?
Your child may need this test if your child's healthcare provider suspects that she
has autoimmune hepatitis. Or your child may need the test if the provider wants to
rule out other liver or metabolic conditions. Signs and symptoms of autoimmune hepatitis
Yellowish skin and eyes (jaundice)
Itching, sometimes over the whole body
Lack of appetite
Nausea or vomiting, or both
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 rule out diseases that resemble an autoimmune
What other tests might my child have along with this test?
Your child's healthcare provider may also order a group of tests known as a liver
panel to help see how well your child's liver is working and look for possible damage
and inflammation. He or she may also order other tests for autoantibodies and a liver
biopsy. A biopsy involves taking a tiny sample of your child's liver to study.
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.
Normal results are negative, meaning that no antibodies were found. 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 child's healthcare
provider will likely order further testing of these antibodies.
If your child's results are positive, it means that antibodies were found and that
your child may have autoimmune liver disease.
How is this test done?
The test requires a blood sample, which is drawn through a needle from a vein in your
Does this test pose any risks?
Taking a blood sample with a needle carries risks that include bleeding, infection,
bruising, or feeling dizzy. When the needle pricks your child's arm, he or she may
feel a slight stinging sensation or pain. Afterward, the site may be slightly sore.
What might affect my child's test results?
Other factors aren't likely to affect your child's results.
How do I get my child ready for this test?
Your child doesn't need to prepare for this test.