The CSD skin test was once used to help diagnose
The test is rarely used today and is not recommended. There are better methods available to diagnose cat scratch disease, such as antibody detection by the EIA test or bacteria detection by a PCR test.
Cat scratch disease skin test
How the Test is Performed
The test site (usually the forearm) is cleansed. An
After 48 to 72 hours, a health care provider will check the injection site to determine whether your body has reacted to the substance.
How to Prepare for the Test
There is no special preparation. People with
How the Test will Feel
When the antigen is injected, you may feel a stinging sensation where the needle is inserted. After the reaction begins, the area may itch or burn.
Why the Test is Performed
This test was once used to diagnose cat scratch disease, before Bartonella henselae, the bacteria that causes CSD, was identified.
Inflammation around the injection site should be less than 5 millimeters wide.
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 area of inflammation larger than 5 millimeters may suggest that you have been infected with cat scratch disease recently or in the past.
Allergic reaction, including itching and hives (rare)
Possible spread of viruses to patient
Although this test has historical value, there are better tests available for diagnosing CSD. Also, the CSD antigen is not widely available and it carries the possible risk of transmitting other harmful substances, such as viruses.
This skin test is not widely available, is not standardized, and is NOT approved by the Food and Drug Administration (FDA).