PATCH TESTS Meaning and
Definition
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Patch tests are a diagnostic tool used in the field of dermatology to determine the presence of allergies or sensitivities to certain substances. It involves applying small amounts of various substances onto the skin in order to observe how the skin reacts. These substances, known as allergens, can be common irritants or specific chemicals or materials that are suspected of causing an adverse reaction.
The process of conducting a patch test typically involves a dermatologist or allergist placing a series of patches or panels containing different allergens onto the skin, usually on the back or arm. These patches are secured with hypoallergenic adhesive tape and left in place for a specific duration, often 24 to 48 hours. During this time, the patient must avoid activities that could potentially irritate or dislodge the patches, such as swimming or excessive sweating.
After the designated time has passed, the patches are removed, and the testing area is examined for any signs of skin reactions, such as redness, swelling, itching, or the formation of blisters. The results are documented and interpreted by the medical professional, who can then determine if the patient has an allergic or sensitive reaction to any of the tested substances.
Patch tests are considered a reliable method for diagnosing contact dermatitis, a common condition characterized by inflammation of the skin due to exposure to allergens. It helps in identifying the specific allergens causing the irritation, enabling the patient to avoid contact with them in the future and manage the condition effectively.
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Etymology of PATCH TESTS
The word "patch tests" originated from the English language. The term consists of two parts: "patch" and "tests".
The term "patch" refers to a small piece or portion of material that is used for covering or mending something, often with the purpose of repairing or strengthening it. In the context of patch tests, "patch" refers to the small piece of tape or adhesive material containing a substance that is applied to the skin to test for allergic reactions.
The term "tests" refers to a procedure or series of actions performed to gather information or determine the capabilities or qualities of something. In the case of patch tests, "tests" refers to the procedure used to determine whether a person is allergic to certain substances by applying them to the skin and observing the reaction.
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