Definition of CSD skin test:

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

The test is virtually no longer used and not recommended. Today, better tests, such as the EIA test, are available to diagnose cat scratch disease.

How the test is performed:

The test site (an area with hair, usually the forearm) is cleansed. An antigen to 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 if your body has reacted to the substance.

How to prepare for the test:

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

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.