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Enzyme Immunoassay (EIA) Test

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A friend of mine, age around 55, frequently experiences bouts of itchy skin. Doctors suspect an allergy, but so far the exact cause has not been identified.

I read about the EIA test and am wondering why no doctor has recommended it, yet.

Can an EIA test find the exact cause that triggers an allergy?

Is it reliable?

What is the cost and where can it be done in Bangkok/ Hua-Hin?

Does anyone have first-hand experience with this?

Thank you in advance.

There are many types of EIA test for many different purposes/

In the case of suspected allergy, it can detect the presence of certain antibodies which can help confirm that the patient has an allergy, but not to what. (Total IGE testing)

It can also be done involves exposing the blood sample to suspected allergens in the lab and then checking for formation of antibodies. It will help only if the person is allergic to the specific allergens applied and it is less sensitive for food intolerances than other types of allergy.

This would normally be done only if skin prick testing was not possible, for example if the patient's skin condition precluded skin testing. It is more expensive and time consuming than skin prick tests.

Bangkok Hospital Hua Hin can do it https://www.bangkokhospital.com/en/bangkok/center-clinic/internal-medicines/bangkok-allergy-and-asthma-center/allergy-test

(RAST test is a brioad term that usually encompasses EIA tests)

So can MedEx and may be less expensive https://medex.co.th/service/checkup-packages/

Though I think they'll send the specimen elsewhere for analysis.

Cost will be around 5 - 9 k depending on what allergens are tested for

Has the patient already had skin prick tests? As that would be more usual fiorst step.

In the case of suspected food intolerance , an elimination diet can also often help and can be done at home by the patient, for free.

  • Author

Thank you Sheryl for your response.

Has the patient already had skin prick tests? As that would be more usual fiorst step. - No. Every time she visit the Doctor, Antihistamines and ointments are prescribed. This was the reason the EIA Test article caught my attention.

17 hours ago, ravip said:

Thank you Sheryl for your response.

Has the patient already had skin prick tests? As that would be more usual fiorst step. - No. Every time she visit the Doctor, Antihistamines and ointments are prescribed. This was the reason the EIA Test article caught my attention.

Sounds like she may be seeing a GP or dermatologist rather than attending an allergy center. Latter would be better choice. Most hospitals have one.

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