Hazelnut (Filbert) Allergy Test in California

The hazelnut (filbert) allergy test is a blood test that checks for an allergic response to hazelnut proteins. It is often ordered when a person has had symptoms like hives, itching, or breathing trouble after eating hazelnuts, or when a clinician needs to confirm or rule out a hazelnut allergy.

What it measures

Hazelnut-specific IgE antibodies — The main marker; it measures antibodies your immune system may make against hazelnut proteins.
Total IgE — A general allergy antibody level that can help put the specific result in context.
Other tree nut-specific IgE — Sometimes tested together to see if reactions may involve other nuts.

Who it is for

A clinician such as an allergist, primary care doctor, or pediatrician typically orders this test after a suspected reaction or when evaluating ongoing allergy symptoms.

Preparation

No fasting or special preparation is needed. The blood sample can be collected at any time of day.

Results and what they mean

Results are usually reported as a number for hazelnut-specific IgE, often with a reference range or class score. A clinician interprets the result along with your symptoms and history; a positive test alone does not always mean a true allergy. This is general information, not medical advice.

Requesting the Hazelnut (Filbert) Allergy Test in California

Order online, choose a certified collection site in California, and review results through a secure portal. No referral is required, and orders are processed confidentially. With coastal metros, inland towns, and rural counties with very different access to testing, it pays to schedule your collection in advance.

Frequently asked questions

Does a positive result mean I am definitely allergic to hazelnuts?

Not always. A positive result shows that your immune system has made antibodies to hazelnut, but only a clinician can determine whether you have a true allergy based on your symptoms and history.

Can I eat hazelnuts before this test?

Yes, no fasting is required. However, if you have had a severe reaction, follow your clinician's advice about avoiding hazelnuts before testing.

How long does it take to get results?

Results are typically available within 1 to 3 business days after the blood sample is collected.

Is this test painful?

It is a standard blood draw, so you may feel a brief pinch when the needle goes in. The collection itself takes only a few minutes.

Hazelnut (Filbert) Allergy Test by city in California

All testing in California → Full Hazelnut (Filbert) Allergy Test guide →