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Doctor insights on: What Is Class 3 Allergy

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What is a class 3 allergy?

What is a class 3 allergy?

Moderate RAST result: Dr. Shulan is correct: type 3 immune reactions involve igg & antigen. "class 3 allergy" may also refer to rast, a blood test for detecting ige against antigen. For convenience labs define from 5 to 7 levels. Class 2 is often borderline & class 3 low positive. But positive is positive. There is little significant difference between class 3 & class 6. Photo: dr & dr ishizaka, discoverers of ige. ...Read more

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Dr. John Chiu
2,479 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 is a class 3 allergy to eggs?

What is a class 3 allergy to eggs?

History is more imp: Not really sure what is meant by this. For food allergy the most important aspect in making this diagnosis is the patient history and what type of reaction occurered. Then food allergy skin test or blood test are done to confirm the history. The level of positivity on these tests are not really predictive of the type of reaction one could have. ...Read more

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What does a class 3 allergy to eggs mean?

What does a class 3 allergy to eggs mean?

High level allergy: When food allergies are evaluated by blood tests, the amount of allergic antibody (ige) against a particular food is quantified and a classification is assigned. The higher the class, the more antibody was found against that food. Class 0 has little or no ige detected while class 6 means very high levels were found. Most allergists feel class 3 or higher indicates significant allergy. ...Read more

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Does a class 3 allergy require an epi pen? My daughter just got diagnosed with a class 3 peanut allergy.

Does a class 3 allergy require an epi pen? My daughter just got diagnosed with a class 3 peanut allergy.

Need epipen (epinephrine): Numbers do not always correlate well with severity of eventual reaction, so I wouldn't say she's safe because it's only a level 3. For something like possible peanut allergy, I'd discuss/consult with an allergist because this situation could be life or death ...Read more

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My 10 month old son has a class 3 allergy to peanuts and milk. When given milk products his face breaks out in hives. is class 3 serious?

My 10 month old son has a class 3 allergy to peanuts and milk. When given milk products his face breaks out in hives. is class 3 serious?

Mgt: Most allergic reactions are mild and involve only the GI system and skin, but sometimes there can be a more severe reaction. It is important to avoid the triggering agents. Your PCP can advise, but there are several good resources for parents online for food allergies. ...Read more

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Recently, I have been coughing for three days. Is it just allergies?

Recently, I have been coughing for three days. Is it just allergies?

Hard to tell: Cough can be due to a number of conditions. A common cold or upper respiratory tract infections is probably the most likely cause but poorly controlled allergies, asthma, and/or GERD can also cause issues with persistent cough. If you have increased post-nasal drip from allergies this is likely contributing. Try symptomatic management. See your primary doctor for further workup if persists. ...Read more

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I want to know three causes of food allergies?

I want to know three causes of food allergies?

8 foods 90% cases: Food allergies are due to allergic antibodies (ige) to food proteins. Up to 10% of the population have ige to a food but eat it without problem as they don't absorb intact food protien that can bind with the ige to produce a reaction. Food allergic people make ige and absorb the intact proteins. Milk, egg, wheat, soy, bony fish, shell fish, tree nuts, peanut account for 90% of food allergies. ...Read more

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Anaphylaxis, allergy and hypersensitivity, what's the difference between these three?

Degrees of severity: Anaphylaxis is an allergy or hypersensitivity reaction to an allergen, usually (there are rare people that we don't know what causes their anaphylaxis). Anaphylaxis is the most extreme form of allergy that has the potential to be fatal if not treated promptly with epinephrine. ...Read more