Allergy

Cedar Pollen Test (IgE) — Detect Japanese Cedar Allergy

Japanese cedar (Cryptomeria japonica) is a coniferous tree whose pollen contains the allergen Cry j 1, a protein known to cause strong allergic reactions in sensitive individuals. This test measures IgE antibodies to Cry j 1 in a blood sample to determine if your immune system reacts to cedar pollen, supporting diagnosis and treatment decisions.

Why Test Ceder Pollen Test?

This test is useful if you experience sneezing, itchy or watery eyes, nasal congestion, or asthma during spring pollen season, already have known pollen allergies and suspect cedar may be a trigger, want to confirm a diagnosis for more targeted treatment or allergy immunotherapy, or need to differentiate cedar allergy from other tree pollens.

What Do High Ceder Pollen Test Levels Mean?

High IgE levels indicate that your body has developed an allergic reaction to Japanese cedar pollen. Treatment options include antihistamines, nasal sprays, and allergen-specific immunotherapy.

What Do Low Ceder Pollen Test Levels Mean?

Low IgE levels make cedar allergy less likely. Other pollen allergies may still explain your symptoms and should be tested if symptoms persist.

Symptoms to Watch For

  • Sneezing during spring pollen season
  • Itchy or watery eyes
  • Nasal congestion or runny nose
  • Asthma-like symptoms
  • Throat irritation or coughing

Who Should Get Tested?

  • People with spring allergy symptoms who suspect cedar as a trigger
  • Those with known pollen allergies wanting to check for cedar sensitivity
  • Individuals planning allergy immunotherapy
  • Anyone wanting to differentiate cedar from other tree pollen allergies

How to Prepare for Your Test

No special preparation is required. No fasting needed. Bring your ID to the sampling location. Bring valid ID to your appointment.

Frequently Asked Questions

Is Japanese cedar pollen a problem in Sweden?
Japanese cedar is not native to Sweden, but the test may be relevant for people who travel to areas where it is common, such as Japan, or who have unexplained pollen allergy symptoms.
Can cedar allergy cross-react with other tree pollens?
Some cross-reactivity with other coniferous trees is possible, though it is generally less common than cross-reactivity within the birch family.
What treatment options exist for cedar allergy?
Treatment includes antihistamines, nasal corticosteroids, and allergen-specific immunotherapy. Avoidance of peak exposure is also recommended.
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Wellth

Our content is written and reviewed by Wellth, and fact-checked against peer-reviewed research and current Swedish clinical guidelines.

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Medical Disclaimer

The information on this page is provided for informational purposes only and does not constitute professional medical advice, diagnosis, or treatment. Wellth provides health information and testing services but is not a substitute for clinical care. Always consult a qualified healthcare provider if you have questions about a medical condition. If you are experiencing severe or urgent symptoms, contact your doctor or call 1177 Vårdguiden. Blood test results should be interpreted by a qualified healthcare professional in the context of your complete medical history.