Campylobacter serology test is a blood test to look for
How the test is performed
A blood sample is needed. For information on how this is done, see:
The sample is sent to a lab, where tests are done to look for antibodies to campylobacter. Antibody production increases during the infection. In the initial stage of an illness, few antibodies may be detected. For this reason, serology tests are often repeated 10 days to 2 weeks later.
How to prepare for the test
There is no special preparation.
How the test will feel
When the needle is inserted to draw blood, you may feel moderate pain, or only a prick or stinging sensation. Afterward, there may be some throbbing.
Why the test is performed
This test is used to detect the presence of antibodies to campylobacter in the blood. Infection with campylobacter can cause aninfectious diarrheal illness. A blood test is rarely done to diagnose campylobacter diarrheal illness. It is commonly used if your doctor or nurse thinks you are having complications from this infection, such as reactive arthritis or Guillain-Barre syndrome.
No antibodies to campylobacter are present.
Note: Normal value ranges may vary slightly among different laboratories. Talk to your doctor about the meaning of your specific test results.
What abnormal results mean
An abnormal (positive) result means that antibodies against campylobacter have been detected. This means you have come in contact with the bacteria.
Tests are often repeated during the course of an illness to detect a rise in antibody levels. This rise helps to confirm an active infection. A low level may be a sign of a previous infection rather than a current disease.
What the risks are
Veins and arteries vary in size from one patient to another and from one side of the body to the other. Obtaining a blood sample from some people may be more difficult than from others.
Other risks associated with having blood drawn are slight but may include:
- Excessive bleeding
- Fainting or feeling light-headed
- Hematoma (blood accumulating under the skin)
- Infection (a slight risk any time the skin is broken)