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CSD skin test   

Overview | Risks | Results

Alternative names:

Cat scratch disease skin test

Definition:

The cat scratch disease antigen, which consists of sterile pus derived from a human lymph node from someone known to have cat scratch disease, is injected under the skin (intradermally) to help determine if you have been infected with cat scratch disease.

How the Test is Performed

The antigen is injected just under the skin, usually on the forearm, so that a small lump pushes the skin up. The lump indicates that the antigen has been injected at the correct depth. The site is labeled, usually with an ink pen.

After 48 to 72 hours, a medical provider will determine if there has been a reaction at the site of the injection.

How to Prepare for the Test

There is no special preparation. People with dermatitis or other skin irritations should have the test performed at a location 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 used more extensively in the past as it was one of the original four criteria used for the diagnosis of cat scratch disease before the bacteria which causes cat scratch disease- Bartonella henselae was identified.

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