The CSD skin test was once used to help diagnose cat scratch disease.

The test is rarely used today and is not recommended. There are better methods, such as antibody detection by the EIA test, available to diagnose cat scratch disease.

This test was once used to diagnose cat scratch disease, before Bartonella henselae, the bacteria that causes CSD, was identified.

The test site (an area with hair, usually the forearm) is cleansed. An antigen related to the bacteria that cuase cat scratch disease is injected just under the skin. After 48 - 72 hours, a health care provider will check the injection site to determine whether your body has reacted to the substance.

There is no special preparation. People with dermatitis or other skin irritations should have the test performed on an area of skin where there is no irritation.

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.