Phadiatop Test: Respiratory Allergy Screening

What Is the Phadiatop Test?

Phadiatop is a blood test that screens for common inhalant (respiratory) allergies. It measures IgE antibodies against a mixture of typical airborne allergens like pollen, dust mites, moulds, and pet dander. In my clinic, I often see patients who come in frustrated by seasonal sneezing or year-round nasal congestion – this test can quickly tell if an allergic component is driving their symptoms.

Why Is This Test Ordered?

This test is a first-line screening when respiratory allergy is suspected. Your doctor might order it if you experience:

• Frequent sneezing, runny or blocked nose
• Itchy, watery eyes
• Wheezing or shortness of breath after exposure to certain environments
• A family history of asthma, eczema, or hay fever

Phadiatop helps differentiate allergic rhinitis from non‑allergic causes, guiding further work‑up and treatment.

How Is the Test Performed?

A simple blood draw from a vein in your arm is all that’s needed. No special preparation is required. The sample is sent to a laboratory where it’s tested using immunoassay technology. Results are usually available within a few days.

Understanding Your Phadiatop Results

Results are typically reported as either negative (no detectable IgE antibodies) or positive (antibodies present). Many labs provide quantitative values in kU/L.

Note: Reference ranges may vary slightly between laboratories. Always consult your physician for interpretation.

What Does a Positive Phadiatop Mean?

A positive result indicates that your immune system has produced IgE antibodies to at least one of the common inhalant allergens in the panel. It does not tell you exactly which allergen is causing the trouble – but it strongly supports an allergic cause for your symptoms. Further testing (specific IgE to individual allergens) can pin down the culprit.

Can the Phadiatop Test Be False Positive or Negative?

No test is perfect. False positives can occur if you have high total IgE or certain immune conditions. False negatives are rare but possible if your allergy is to an uncommon allergen not included in the mix. In my experience, the test has very good sensitivity and specificity when used appropriately.

Phadiatop During Pregnancy

The test is safe during pregnancy as it only involves a blood draw. It can help manage allergic symptoms that might affect sleep and quality of life without exposing the foetus to unnecessary medications. Discuss with your obstetrician before testing.

How to Prepare for the Phadiatop Test

No fasting or special diet is needed. Continue your regular medications unless your doctor advises otherwise. Antihistamines do not affect IgE levels, so you can take them as usual.

Phadiatop vs. Skin Prick Testing

Both methods detect IgE‑mediated allergies. Skin prick testing gives immediate results in the clinic, but it can be affected by certain medications (antihistamines) and skin conditions. Phadiatop is not influenced by such factors and is often chosen for patients who cannot stop antihistamines or have severe eczema.

LOINC Code

The standard LOINC code for this test is 22086‑1 (Allergen panel, inhalant – Phadiatop).

What Happens After a Positive Result?

Your doctor will correlate the result with your history and perhaps order specific IgE tests for individual allergens like grass pollen, cat dander, or house dust mite. Management may include allergen avoidance, nasal corticosteroids, antihistamines, or immunotherapy (allergy shots).

If you’ve been struggling with sneezing, congestion, or itchy eyes, the Phadiatop test can provide clarity. Talk to your healthcare provider about whether this screening is right for you.