CSD skin test
Definition
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.
Alternative Names
Cat scratch disease skin testWhy the Test is Performed
This test was once used to diagnose cat scratch disease, before Bartonella henselae, the bacteria that causes CSD, was identified.
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.
Risks
- Allergic reaction, including itching and hives (rare)
- Possible spread of viruses to patient
Considerations
Although this test has historical value, there are better tests available for the diagnosis of CSD. In addition, the CSD antigen is not widely available and carries the potential risk of transmitting other harmful substances such as viruses.
Normal Results
Inflammation around the injection site should be less than 5 millimeters wide.
What Abnormal Results Mean
An inflammation zone of greater than 5 millimeters may suggest that you have been infected with cat scratch disease recently or in the past.
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