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Doctor insights on: Skin Allergy Testing Procedure

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Skin allergy testing. Can there be false negatives?

Skin allergy testing. Can there be false negatives?

Yes: The tests can have both false positive and false negative results. There are many factors that can influence the results such as the antigens, host factors, timing and medications. The results need to be interpreted in the context of the history. ...Read more

Dr. Paul Carter
178 Doctors shared insights

Allergy Tests (Definition)

Allergies can be identified by allergy tests. The best allergy test is a skin test. It is safe and reliable. The next best allergy test is a blood test - less reliable than skin tests but also safe. If we are looking into food allergy then a challenge test is very reliable but ...Read more


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Dermographism, are skin allergy testing not accurate?

Dermographism, are skin allergy testing not accurate?

Limited use: Skin testing for allergy is of limited usefulness even when a person does not have dermatographism. The history is the key; skin testing can be confirmatory. Especially, don't conclude that you must severely limit what you do and eat, and where you go, based on skin testing. It's just one piece of information that helps guide decisions. ...Read more

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Are fals positives from a skin allergy tests common?

Are fals positives from a skin allergy tests common?

Controls: If done properly, with adequate controls false positive tests are very infrequent, but also remember that just because you test positive accurately, it does not mean that you will develop symptoms from exposure to that allergen. ...Read more

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What are skin allergy tests for hair dyes?

What are skin allergy tests for hair dyes?

Patch Test: To test for allergy to hair dye, a small patch containing the hair dye chemical is placed on the skin and held in place by tape for 48 to 72 hours. After removal, the doctor will look for a local reaction where the hair dye contacted the skin to diagnose allergy to the dye (phenylenediamine). ...Read more

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Does it hurt to get skin allergy tests?

Does it hurt to get skin allergy tests?

Not really: Allergy skin tests currently are performed using sterile, plastic, applicators (not needles) that just puncture the skin at a mild depth. No blood. Typically 8 tests can be placed in 2 seconds using multitest device and the answer is available in 15-20 minutes. The new multi-test PC (pain control) has even less uncomfortable feeling; my experience is that it works great for children and adults. ...Read more

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Is it normal to have positive reactions to all environmental skin allergy tests then 6-7 years later have all negative reactions? Both as an adult

Is it normal to have positive reactions to all environmental skin allergy tests then 6-7 years later have all negative reactions? Both as an adult

Disappearing allergy: Although allergies will diminish with age it is unusual for skin tests to change dramatically over time. Sometimes allergy immunotherapy can reduce sensitivity a little. Another possible explanation is that you were taking medication that blocked your more recent tests. You might consider another opinion from an allergist certified by the american board of allergy and immunology. ...Read more

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Is allergy testing on skin safe?

Is allergy testing on skin safe?

Yes: But only when the proper precautions are taken. For example, one should be tested to the prick method first before intradermal skin testing is done if the prick test was negative. Even then, anaphylaxis may rarely occur. Is it 100% safe? Nothing is. Is it 99% safe, yes when done by a board certified allergist/ENT. ...Read more

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Dizzyness after allergy testing. I have work in an hour and I can't pick my head up.?

Dizzyness after allergy testing. I have work in an hour and I can't pick my head up.?

Rush to ER: You need to call 911 to get you to the ER. This sounds like an anaphylactic reaction. Don't delay another second. ...Read more

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How does allergy testing work? Trying to find out if I'm allergic to a scent - skin issues or food that triggers it?

How does allergy testing work? Trying to find out if I'm allergic to a scent - skin issues or food that triggers it?

Blood test: An allergist will recommend blood tests geared at categories or specific substances you may be allergic to. They may do an oral or contact challenge to see how bad your reactions are. The best recommendation is to see an Allergist and get the best treatment and diagnosis. ...Read more

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Why would chest clinic send me for skin prick allergy testing?

Asthma + allergy: Frequently people with asthma also have allergies. About 90% of children with asthma have allergies and 50% of adults with asthma have allergies. Checking for allergies is an important part of assessing patients with recurrent cough, wheezing, chest tightness and shortness of breath. ...Read more

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Dr ordered blood allergy tests, but I've read these tests are unreliable. If they show food allergies should I believe it? Skin testing is negative.

Dr ordered blood allergy tests, but I've read these tests are unreliable. If they show food allergies should I believe it? Skin testing is negative.

Need confirmation: RAST blood tests can be suggestive of some food allergies, but will need to be confirmed by some sort of food challenge to be diagnostic of that food allergy. ...Read more

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I am having allergy testing done. (i assume skin tests) the instructions say I should stop taking Nexium (esomeprazole) 10 days before the test? Why?

No need to stop: For prick skin testing no need to stop esomeprazole (nexium). The class of medications to which Nexium belongs, does not have an antihistaminc effect, as opposed to the anti-h2 (histamine type 2)receptor medications (tagamet, zantac, (ranitidine) pepcid) that do interfere with skin testing. Double check with your physician. ...Read more

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Just had skin prick allergy testing and allergist said it was inconclusive because I reacted to all 40 allergens equally. What's the next step in test?

Inconclusive or not: Usually there is a positive control (histamine) and a negative control (glycerin) when you have a skin allergy test. If you don't react to histamine then lack of response to other antigens is inconclusive. However, if you are positive to histamine, negative to glycerin, and positive to all antigens tested then that means you are highly allergic and would probably benefit from desensitization ...Read more

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Persistent, itchy rash for four days following allergy skin testing. Rash is at the site where the allergy testing was performed. Is this normal?

Persistent, itchy rash for four days following allergy skin testing. Rash is at the site where the allergy testing was performed. Is this normal?

Well if there is a: Rash where the allergy testing material was, then the rash is actually a positive reaction to the test product. If you have a generalized rash, it could be to the adhesive. See your allergist that performed the testing for absolute answers. Hope that helps ...Read more

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I've heard that skin tests are better and more effective for food allergy testing than blood tests. If I use HealthTap, how can skin tests be done?

I've heard that skin tests are better and more effective for food allergy testing than blood tests. If I use HealthTap, how can skin tests be done?

See actual doctor: Health tap could not help when A physical doctor visit become necessary. Allergy test is one of them. So the best way is to see allergy specialist in your area ...Read more

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My 8 year old son has dry skin on his back. Should I take him for allergy tests?

My 8 year old son has dry skin on his back. Should I take him for allergy tests?

Try emollient: If your son does not have any symptoms, like itching, testing is not needed. You may try applying an emollient like Vaseline.
Wish you and your son good health. ...Read more

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I went for allergy tests (the skin pricking) and passed out, should I be concerned?

No: You had a vaso vagal response its the same response that someone who passes out while getting an injection has. ...Read more

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Is it normal for allergy tests to give different answers (comparing blood vs. Skin)?

Is it normal for allergy tests to give different answers (comparing blood vs. Skin)?

It can be.: A blood allergy test measures ige response to allergens. These responses are graded from 0 to 6 where 0 is no reaction and 6 is maximum of ige to allergen. The skin test is where a small amount of allergen is injected into the skin and if there is 2mm swelling after 10 min. It's positive. The ige antibody levels in blood do not always correlate with the allergic reaction, so there can be a diff. ...Read more

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Are skin-prick allergy tests accurate/trustworthy? I still get occasional hives & worry about foods, but my allergy test showed no food reactions.

Are skin-prick allergy tests accurate/trustworthy? I still get occasional hives & worry about foods, but my allergy test showed no food reactions.

Hives - not allergy: Prick skin tests are helpful if positive and the patient has a history suggestive of allergy. They are insufficient to make a diagnosis of food allergy by themselves. Hives, in most cases, are not a sign of allergy, particularly in chronic cases. Also, the likelihood of new food allergies at your age is very low. Unless there are there symptoms and antihistamines control your symptoms. ...Read more

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Animal protein gives me rhinitis and weaker bladder. How is this possible? . Skin allergy tests don't show any allergies.

Animal protein gives me rhinitis and weaker bladder. How is this possible? . Skin allergy tests don't show any allergies.

Skin tests,: While great for diagnosing inhalants (pollen, dander, dust mite), aren't great at evaluating food hypersensitivity. Sometime blood tests can help figure it out, but they are also not that reliable. If you know what causes the rhinitis (and weaker bladder from blowing your nose?), then you need to avoid it. The good news is that people who eat lots of whole fruits and vegetable live healthier lives. ...Read more

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I am terrified to introduce peanut butter to my 5 year old's diet. He has no food other allergies but he does have asthma and very sensitive skin. Is there any safe, suggested method for introducing foods? Can we get allergy tests first?

I am terrified to introduce peanut butter to my 5 year old's diet. He has no food other allergies but he does have asthma and very sensitive skin. Is there any safe, suggested method for introducing foods? Can we get allergy tests first?

Yes: This issue is still being researched. If a child has other allergic conditions like asthma or eczema or if he has siblings with food allergy it is recommended in infants they be tested for peanut allergy and then peanut introduced at young age with thought that this will prevent allergy in future. However in a 5 year old there are no good recommendations for intro. See allergist for test and intro ...Read more

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My husband breaks out in welts / hives on his upper body. Face and head swells really bad. Gets a fever with it. He's had blood/allergy tests.?

My husband breaks out in welts / hives on his upper body. Face and head swells really bad. Gets a fever with it. He's had blood/allergy tests.?

Don't know: Hives and swelling are common. With fever - can happen. Has this been happening for awhile? Does it itch? Do antihistamines (like benadryl) help? Test results? His case sounds unusual, but don't have enough details. Time to see a board certified allergist. ...Read more

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Past year have had 2 pfts, chest xrays, head CT 1 ekg, 1 eng bloodwork allergy tests. All normal. Should I get retested or assume it's anxiety?

Past year have had 2 pfts, chest xrays, head CT 1 ekg, 1 eng bloodwork allergy tests. All normal. Should I get retested or assume it's anxiety?

Probably normal: I think you have had extensive testing and this has turned out to be negative, if there are no other associated symptoms I would not consider nay further testing unless the symptoms worsen or change. You do not mention about lifestyle, exercise and weight, it would be prudent to get an idea of where these issues lie, if you are otherwise in good shape it may be unrelated. Would wait and monitor ...Read more

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SOB tight chest light head. Have had many blood tests pfts xrays sonogram head CT nerve testekg allergy tests in a year. All clear. Second opinion?

SOB tight chest light head. Have had many blood tests pfts xrays sonogram head CT nerve testekg allergy tests in a year. All clear. Second opinion?

Anxiety/Allergy?: Good to know that there is no structural problem with heart or lung. If these symptoms are seasonal= Allergic component.
If associated with stress =Psychogenic component.
If positional Orthostatic Hypotension causes lightheadedness.
Make sure you are Drinking electrolyte liquids, balanced food.
Some times Pet'shair may cause these symptoms ...Read more

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How can allergy testing work?

Skin prick testing: There are several ways to do skin testing, but this is how it's done in my office:

https://www. Youtube. Com/watch? V=rv29bqdpaoc&list=uuhbdgetayj63q1tsyr1yykg&index=9. ...Read more

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Does allergy testing detect all allergies?

Does allergy testing detect all allergies?

No: Appropriate allergy testing is guided by the patients history and physical examination. Based upon this one's allergist will make a decision what to be tested for. The test, particularly for outdoor allergens is based upon the common allergens is that particular agricultural zone. Does this mean that all allergens will be tested no. ...Read more

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What is the advantage of ISAC allergy testing over RAST or SPT?

What is the advantage of ISAC allergy testing over RAST or SPT?

ISAV: Is considered more SPECIFIC and is useful when there are allergies detected by older tests (RAST) are multiple and it becomes difficult to detect the SPECIFIC
OFFENDING allergens!

Hope this is helpful!
Dr Z ...Read more

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How do I get rid of this itch from allergy testing?

How do I get rid of this itch from allergy testing?

Allergy testing: Testing can cause some welts and redness due to histamine release. Use cold compresses and Benadryl (diphenhydramine) cream to help sooth the area. ...Read more

Dr. John Chiu
2,630 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