Allergy blood testing in Bangkok: the Allergy 102 guide

What is the Allergy 102 blood test?

The MedEx Allergy 102 test is a laboratory blood panel that measures allergen-specific immunoglobulin E (IgE) against a defined selection of food and environmental triggers. It is designed to support the investigation of immediate-type allergic reactions, particularly when symptoms and exposures suggest more than one possible trigger.

The final wording matters: 100 named allergens + Total IgE + CCD marker = 102 report items. Of the named allergens, 51 are foods and 49 are environmental allergens. A routine venous blood sample is required, and the stated turnaround time is 2 days.

Who may consider allergy testing?

An allergy blood test may be useful when symptoms repeatedly occur soon after eating, touching or inhaling a suspected trigger. Examples can include:

• sneezing, nasal congestion, an itchy or runny nose, cough or wheeze;
• hives, itching, swelling, redness or eczema-like skin flares;
• itchy, red or watery eyes;
• abdominal pain, vomiting or diarrhoea after a suspected food exposure.

Testing should answer a clinical question. A clinician may help you decide whether a broad panel is appropriate or whether targeted testing is more useful, especially for children, people with complex medical histories, and anyone who has experienced a severe reaction.

Examples of food allergens

The food portion includes common triggers such as egg white, milk, wheat, soy bean, peanut, almond, walnut, sesame, celery, apple, peach, mango, shrimp, crab, lobster, scallop, salmon, tuna, codfish and several other fish and shellfish. The complete searchable list is available on the MedEx test page.

Examples of environmental allergens

The environmental portion includes house dust mites, storage mites, common moulds, grass pollens, tree pollens, weed pollens, cat and dog epithelium or dander, other animal allergens, cockroach, bee and wasp venom, latex and house dust.

How the test works in Bangkok

Ask the MedEx team whether collection is available at a clinic, your home or your hotel in Bangkok. Availability and any visit fee should be confirmed during booking.

How to understand a specific IgE result

A specific IgE result measures sensitisation to a tested allergen. A positive result can support an allergy assessment, but it is not a diagnosis by itself. The number must be interpreted together with your symptoms, the timing and amount of exposure, your medical history and, where appropriate, further clinical testing.

A higher IgE class indicates a greater concentration of allergen-specific IgE; it does not reliably predict how severe a future reaction will be. A low positive result may not be clinically relevant, while an important allergy can require assessment beyond a single laboratory number.

What does the CCD marker add?

Cross-reactive carbohydrate determinants, or CCDs, are structures found in many plant and insect proteins. IgE binding to CCDs can contribute to multiple positive laboratory results that do not always match clinical symptoms. The CCD marker gives the reviewing clinician additional context; it should not be used alone to dismiss or confirm any result.

Blood test or skin-prick test?

Both approaches can identify IgE sensitisation, but neither replaces a careful clinical history. A blood test can be practical when skin testing is difficult, when certain medicines or skin conditions affect skin testing, or when a broad laboratory panel is preferred. Skin-prick testing provides a different form of evidence and may be recommended by an allergy specialist. In selected cases, a medically supervised challenge is the reference approach for answering whether a person clinically reacts to a food.

How to prepare

• Fasting: not required for the Allergy 102 test. Confirm instructions if you are combining it with other blood tests.
• Medicines: do not stop prescribed medicine unless your treating clinician tells you to. Ask MedEx if you have questions about your booking.
• History: note suspected triggers, the time between exposure and symptoms, symptom type, amount consumed or encountered, and any treatment required.
• Previous reports: bring earlier allergy tests and relevant medical information if available.

Why book the Allergy 102 test with MedEx?

The panel offers a single, clearly defined report covering common food and environmental allergens, supported by Total IgE and a CCD marker. For patients in Bangkok, MedEx can coordinate booking and advise on available collection options. The test is listed at ฿4,999 per person, with results stated in 2 days.

The strongest reason to test is not simply the size of a panel—it is having a focused question and using the report responsibly. MedEx’s detailed test page lets you search the complete allergen list before you book, so you can check whether your suspected trigger is included.

Medical disclaimer: This article is for general education and does not replace medical advice, diagnosis or emergency care. Test availability, price, turnaround time and collection arrangements should be confirmed at booking. Laboratory results must be interpreted in clinical context.