Patch Testing

A number of patch tests with different substances will be taped on your back (the number depends on the physician’s choice). Each patch test accommodates 10 potential allergic substances.

A base line series with the most common allergy-causing substances is usually always tested. Additional substances can be added depending on what you and your doctor has come up with before.

The patch tests will be removed after about 2 days, and a first reading can be made 20-30 minutes after removal, if test patches are removed at the clinic.

If you get a very strong reaction with strong itching and redness in any of the test patches, contact your doctor, who may then decide whether you should stop and remove the patch test. Your doctor will inform you if further readings are required within the next 5 to 7 days.

• Keep the test area on the back dry during this time period and avoid heavy and physical exercises that can cause excessive sweating as this may lead to the patch tests coming off.
• Cortisone creams and antihistamines should not be used during the entire test period.
• Avoid sunbathing on the test area.
• The recommendation is also that you should wear loose clothing and sleep in a t-shirt as this helps to prevent the patch tests from rubing or peeling off the skin.

Have someone press on the test patches. If necessary, you can also reinforce them with additional tape on the edges of the test units.

Try not to scratch at the test site, because the itching is usually a sign of a positive reaction and the itching can alter the test results.

Your doctor will tell you what you are allergic to, including where and in what types of products the substance can be found, and how you do to avoid the substance in the future. You will also get you an information sheet.

Negative results are very common. If the test is negative, this is also important information, you will not need to avoid the topics you now tested.

However, there are many more substances that can cause your symptoms. Some patients need to do further testing to determine if they are allergic to these substances.

Your doctor can also determine whether your symptoms are due to an irritation reaction, and then tell you about how to better take care of your skin and avoid irritating substances. If your doctor determines that your skin reaction is due to anything other than a contact allergy, you may be referred to a specialist for further tests and treatment.