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Doctor insights on: Allergy Scratch Test

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How accurate is an allergy scratch test?

How accurate is an allergy scratch test?

Allergy skin test: Allergy skin tests in the hands of a trained allergist are very helpful in determining the most likely causes of allergy symptoms. No test is perfect, and sometimes allergy tests can miss allergies and sometimes they can cause them to be overdiagnosed. That's why you need a doctor to take your history and interpret the test together with all the information about your symptoms and activities.

Dr. John Chiu
2,606 Doctors shared insights

Allergies (Definition)

Allergies occur when your immune system is triggered by envirionmental factors it should ignore--for example, pollen in the air, or dander on a cat or dog--and creates cells to fight against them. An allergic reaction typically causes itching, congestion, or drainage, and ...Read more


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What exactly is an allergy scratch test?

What exactly is an allergy scratch test?

Best allergy test: Scratch or prick skin testing is the primary skin test method used by allergists. A drop of the material in question is put on the surface of the skin and a small pointed device is used to prick the skin surface exposing a very small amount of the material (antigen) to the subject. If the person has sufficient numbers of sensitive mast cell a hive appears due to histamine released = positive test.

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How long does a allergy scratch test take?

How long does a allergy scratch test take?

1 sec and 20 min: Putting on the test takes 1 or 2 seconds. You then wait 20 minutes to have the tests read.

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What is an allergy scratch test for?

Tests for allergies: Allergy scratch tests are used to assess whether or not you are allergic to pollen, mold, pets, dust mites, insects, foods, etc...

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Does an allergy scratch test test for mold and dust allergies?

Does an allergy scratch test test for mold and dust allergies?

Yes: Skin allergy testing can check for number of allergens. These include environmental and food allergens.

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2 days ago got tested for allergies (scratch test) only spots w/reaction were histamine+mold. Now there are red spots (not the pricks) itchy, causes?

2 days ago got tested for allergies (scratch test) only spots w/reaction were histamine+mold. Now there are red spots (not the pricks) itchy, causes?

ST reaction: The skin test response to allergen may start within minutes followed by a delayed response from 2-8 hrs later. The delayed reaction may linger for a few days. However the reaction consists usually of a raised wheal and not just redness. Are your red spots raised or flat?

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What is an allergy skin prick or scratch test?

What is an allergy skin prick or scratch test?

Allergy test: An allergist will introduce small amounts of specific antigens or substances that can cause allergy through a small needle into the skin. The allergist then looks for a reaction. Typically multiple allergy tests are performed in the same session.

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Hi if your food allergies skin prick test scratch points get red not swell what does mean?

Hi if your food allergies skin prick test scratch points get red not swell what does mean?

Borderline: Depending on your history and symptoms, some results can be significant, other not. Your allergist should advice you best.

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Is the scratch test for environmental allergies accurate and useful?

Is the scratch test for environmental allergies accurate and useful?

Incredibly: Skin prick testing is the most accurate way to test for environmental allergies. Blood testing is the 2nd most accurate although a far cry from skin testing. All other non-approved forms of testing............Well, I simply state, "let the buyer beware! " there is a reason insurance doesn't cover the non-approved methods...

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I've been "back scratch" tested for allergies. Can the doctors do a allergy tests for specific types?

See below: The scratch test does test for specific allergies. Blood work can also be requested for allergies. However, most allergist believe the skin testing is more accurate.

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I've been "back scratch" tested for allergies. Can the doctors do a allergy tests for specific types of dogs?

I've been "back scratch" tested for allergies. Can the doctors do a allergy tests for specific types of dogs?

No: There is no commercially available tests for specific breeds of dogs. You can be allergic to a common shared allergen, a breed specific allergen, or both. Unfortunately, the currently available testing material is for mixed breeds as well as the common shared allergen and not available seperately.

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I went for a allergy test they said I am allergic to nickel and chollophony got some advantan and anti-histamine but still scratch a lot some days?

I went for a allergy test they said I am allergic to nickel and chollophony got some advantan and anti-histamine but still scratch a lot some days?

Use creams!: Good morning, allergy to nickel and colophony are contact allergies and are treated by application of local steroid (cortisone) creams. Antihistamines are usually not helpful as histamine not the agent involved in these types of contact allergies. Antihistamines are beneficial for allergies due to pollens, molds, dusts, etc.

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What is a 'scratch test' for?

Allergies: This is done in the office by an allergist with very specially prepared dilute solutions of things that you may be allergic to in order to determine environmental allergies.

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Has anyone here got a scratch test infection?

Never seen one: In private practice for ten years. The testing area should be cleaned thoroughly before testing.

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How much pain should I expect from a TB scratch test?

How much pain should I expect from a TB scratch test?

Tb scratch test: Not very painful. You probably won't even be bothered by it.

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How long should the bumps and itching last after a scratch test?

How long should the bumps and itching last after a scratch test?

Minutes to hours: Depending on the degree of sensitivity, if really bothersome call your doctor, can try OTC hydrocortisone cream 1% topically /antihistamine like cetirizine, good luck

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How is a scratch test done?

Scratch test: A drop of cocentrated allergic testing material is applied to the skin. Then an instrument called a scarifier is used to remove an outer portion of skin without causing bleeding to help the material get under the skin better so that it can be read by the allergist.