Allergy tests in adults: what you need to know and how to choose the right method

Allergies can appear unexpectedly — in adulthood, even without previous episodes in childhood. Often, symptoms — from a runny nose to chronic fatigue — are not immediately associated with an allergic reaction. In such cases, accurate diagnosis plays a key role. Let's consider what testing methods are available today and how to understand what exactly is causing the body's negative reaction.

When to take allergy tests

Allergy is suspected when a person experiences the following conditions:

• recurring rash, itching for no apparent reason

• swelling of the eyelids or lips after eating certain foods

• seasonal nasal congestion, sneezing, or coughing

• reactions after contact with animals or household chemicals

• intolerance to certain medications

In such cases, testing helps not only confirm the allergy, but also identify the specific substances that cause it.

Available testing methods in adults

Laboratory methods (blood tests)

Specific IgE antibody testing can detect reactions to specific allergens. This method is suitable for patients with severe allergic manifestations or when skin testing is not possible.

Advantages:

• safe even with exacerbation of allergies

• dozens of allergens can be tested simultaneously

• does not require discontinuation of antihistamines

Molecular allergy diagnostics (ImmunoCAP, ALEX²)

Detects not only the allergen, but also the specific protein fraction that causes the reaction. This allows you to distinguish between a true allergy and cross-reactivity (e.g. pollen and apples).

Recommended for:

• complex, multi-allergen conditions

• preparation for specific immunotherapy

• suspected anaphylaxis

Skin prick tests

Drops of allergens are applied to the skin of the hand, followed by a light puncture. The reaction is assessed after 15–20 minutes.

Limitation:

• prohibited while taking antihistamines

• not suitable for exacerbation of dermatitis

Provocative tests

They are performed only in a hospital setting under strict supervision. They involve the introduction of the allergen into the nose, eyes, or orally.

Applicable:
– to confirm food or drug allergies
– when other tests have given questionable results

Is it worth undergoing allergy panels?

Modern laboratories offer allergy panels — standardized sets of allergens by topic:

• food panel (milk, eggs, nuts, fish, cereals)

• inhalation panel (tree pollen, dust mites, animal dander)

• mixed panel (for pre-screening)

This approach is effective at the initial stage, when it is not yet known which allergen to suspect.

Decoding the results: is everything so clear?

The level of IgE antibodies to each allergen is determined in the blood. The results are interpreted according to a class scale:

• Class 0 – negatively

• Class 1 – weak sensitivity

• Grade 2–3 – moderate

• Grades 4–6 – high

However, even a high grade does not always mean a clinically significant allergy. The final word is with an allergist who compares laboratory data with symptoms.

How to prepare for tests

• Stop antihistamines 5–7 days before the test (for skin tests)

• Avoid intense physical activity before blood collection

• It is not necessary to be fasting for a laboratory test, but it is advisable.

• In case of chronic diseases, consult a doctor.

Why is it important to diagnose allergies in adults?

Unlike children, allergies in adults are more likely to be chronic, with a risk of complications such as asthma, sinusitis, and bronchitis. In addition, adults are less likely to attribute their symptoms to allergies, which delays diagnosis.

Timely testing not only makes life easier, but also prevents the development of more severe forms of the disease. Modern diagnostics are individual, accurate, and safe.