Quick Facts
- Sample: Blood
- Fasting: No special preparation required.
- Turnaround: 3-5 business days. May take longer based on weather, holiday or lab delays.
What This Test Measures
The Watermelon Serum Test measures IgE antibody levels to watermelon (F329-IgE Watermelon) in a blood sample. IgE antibodies are proteins your immune system produces in response to substances it views as harmful, and they are involved in allergic reactions.
This test looks at one food only: watermelon (Citrullus lanatus; Citrullus vulgaris). It does not measure other foods, including other members of the gourd family. A result shows your IgE response to watermelon, which is not the same as a confirmed clinical food allergy.
Benefits
- Measures watermelon-specific IgE antibodies in a blood sample.
- Focuses on one food: watermelon.
- Requires no special preparation before your blood draw.
- Gives you lab information to review with your healthcare provider.
- Adds a data point to consider alongside your symptoms and history.
Who Is This Test For?
- People who notice tingling in or around the mouth after eating watermelon.
- People who experience itching, hives, or eczema after eating watermelon.
- People with stomach symptoms after watermelon, such as abdominal pain, nausea, vomiting, or diarrhea.
- People who react after eating foods containing watermelon, such as beverages, sorbet, or fruit cups.
- People who want watermelon IgE information to discuss with a healthcare provider.
How It Works
- Order Your Test Online
- Visit a Local Lab
- Get Results Online
FAQ
1. What does the Watermelon Serum Test measure?
It checks your blood for IgE antibodies to watermelon (F329-IgE Watermelon). This information may help your healthcare provider evaluate your immune response to this one food. It does not test other foods, and a result alone does not confirm a clinical food allergy, predict how severe a reaction could be, or show whether watermelon is safe for you to eat.
2. Who should consider this test, and when?
Testing may be worth discussing if you have noticed symptoms after eating watermelon or foods that contain it, such as mouth tingling, swelling, itching, hives, or digestive upset. Watermelon allergy is uncommon, so your history and symptoms matter. If you have signs of anaphylaxis, such as a swollen throat, trouble breathing, or extreme dizziness, seek immediate medical attention rather than waiting for a test.
3. Do I need to fast or prepare for this test?
No special preparation required.
4. How quickly will I get my results?
Expect results in 3-5 business days. May take longer based on weather, holiday or lab delays.
5. How should I interpret my results, and what if they are abnormal?
Your result reflects the level of watermelon-specific IgE antibodies in your blood, and its meaning depends on your symptoms, history, and other clinical information. It does not by itself confirm or rule out a clinical food allergy. If your result is outside the reference range, review it with a qualified healthcare provider, who can decide whether further evaluation is appropriate.
Disclaimer: Reference ranges may vary by laboratory. Listed ranges are general guidelines and may differ from those used by the performing lab. Always consult your healthcare provider for interpretation.
Pre-test preparation
No special preparation required.
Cross-Reactivity
Cross-reactivity may occur when your immune system recognizes similar proteins in different foods or pollens. This test measures only watermelon and does not test for any of the items listed below. These examples are not exhaustive, and they are possible considerations, not confirmed allergies. Depending on your history, symptoms, or your healthcare provider's guidance, related allergen testing may be worth discussing.
- Ragweed pollen: Some people with ragweed pollen allergy report mouth itching or tingling after eating watermelon and other melons, a pattern known as pollen-food allergy syndrome.
- Grass pollen: Some people with grass pollen allergy may also notice oral symptoms with melons, including watermelon.
- Other melons (cantaloupe, honeydew): Melons are commonly grouped with watermelon in ragweed pollen associations, and some people may react to more than one.
- Cucumber and zucchini: These gourd family foods are also listed in ragweed pollen associations, and some people may notice similar mouth symptoms.
- Banana: Banana has been associated with ragweed pollen-related oral symptoms, which may overlap with reactions to melons.
