Blueberry F288 IgE test (food allergy blood test)
It measures IgE antibodies to blueberry to help assess allergy risk, and you can order it through Vitals Vault with Quest lab collection.
This panel bundles multiple biomarker tests in one order—your report explains how results fit together.
Blueberry F288 IgE is a blood test that looks for immunoglobulin E (IgE) antibodies your immune system may make in response to blueberry proteins. It is one way to evaluate whether blueberry could be a trigger for immediate-type allergic symptoms.
This test does not “prove” you have a clinical allergy on its own. It helps estimate the likelihood of an IgE-mediated reaction when it is interpreted alongside your history, timing of symptoms, and (when appropriate) other allergy testing.
If you are trying to decide whether to avoid blueberries, reintroduce them, or understand a past reaction, this result can give you a clearer starting point for a clinician-guided plan.
Do I need a Blueberry F288 IgE test?
You may consider Blueberry F288 IgE testing if you have symptoms that start soon after eating blueberries or foods containing blueberries. Typical IgE-type reactions happen within minutes to a few hours and can include hives, itching, lip or tongue swelling, throat tightness, wheezing, vomiting, or lightheadedness.
Testing can also be useful if you have unexplained reactions to mixed foods (smoothies, baked goods, fruit blends) and you are trying to narrow down which ingredient is most likely responsible. If you already have pollen allergies (such as birch) or oral allergy syndrome (itching/tingling in the mouth with raw fruits), a blueberry-specific IgE result may help your clinician decide whether your symptoms fit a cross-reactivity pattern.
You may not need this test if your symptoms are delayed by many hours, are limited to chronic digestive discomfort, or occur inconsistently without a clear relationship to blueberry exposure. Those patterns are less typical for IgE-mediated allergy and may call for a different evaluation.
This test is meant to support clinician-directed care and safer decision-making around food exposure; it is not a standalone diagnosis.
This is a laboratory-developed specific IgE blood test performed in a CLIA-certified lab; results must be interpreted in clinical context and do not diagnose allergy by themselves.
Lab testing
Ready to order Blueberry F288 IgE and test at a Quest location?
Schedule online, results typically within about a week
Clear reporting and optional clinician context
HSA/FSA eligible where applicable
Get this test with Vitals Vault
If you want a clear, documented blueberry-specific IgE result without a long wait for an appointment, you can order Blueberry F288 IgE through Vitals Vault and complete your blood draw at a Quest collection site.
After your result posts, PocketMD can help you translate the number into plain language questions to bring to your clinician, such as whether your pattern fits an IgE-mediated reaction, whether an oral food challenge is appropriate, and what to do about related foods or pollens.
If your symptoms involve multiple foods or you are trying to map a broader allergy picture, you can also use Vitals Vault to add companion tests and retest over time when your clinician recommends it (for example, after a period of avoidance or after changes in allergy treatment).
- Order online and use nationwide Quest draw locations
- Results you can download and share with your clinician
- PocketMD helps you plan next steps and follow-up questions
Key benefits of Blueberry F288 IgE testing
- Helps assess whether your immune system is sensitized to blueberry proteins (IgE-mediated pathway).
- Adds objective data when you have rapid symptoms after blueberries but the trigger is unclear.
- Supports safer decisions about avoidance versus supervised reintroduction with your clinician.
- Can help distinguish likely IgE-type reactions from non-allergic food intolerance patterns.
- Provides a baseline you can compare over time if your clinician recommends repeat testing.
- Helps guide whether broader food or pollen-related testing might be useful for cross-reactivity.
- Creates a shareable lab record you can review with PocketMD and your care team.
What is Blueberry F288 IgE?
Blueberry F288 IgE is a “specific IgE” blood test. It measures the amount of IgE antibodies in your blood that bind to blueberry (the allergen code is f288). IgE is the antibody class involved in immediate-type allergic reactions, where exposure can trigger mast cells and basophils to release histamine and other mediators.
A positive result means your immune system recognizes blueberry proteins and has made IgE against them (sensitization). Sensitization increases the probability of an allergic reaction, but it is not the same as having symptoms every time you eat blueberries. Some people have detectable IgE and tolerate the food, while others react at low levels.
Your clinician typically interprets this test alongside your symptom history, the timing of symptoms after exposure, other allergies (especially pollens), and sometimes additional tests such as skin prick testing or component testing (when available).
IgE sensitization vs. clinical allergy
Clinical allergy means you develop reproducible symptoms with exposure. Sensitization means the lab detects IgE, but you may or may not react. The closer the match between your history and the lab result, the more clinically meaningful the number tends to be.
Why fruit IgE tests can be tricky
Some fruit reactions are driven by cross-reactive proteins shared with pollens (often causing mouth and throat itching with raw fruit). In those cases, the risk profile can differ from a classic systemic food allergy, and your clinician may focus on symptom pattern and severity rather than the number alone.
What do my Blueberry F288 IgE results mean?
Low Blueberry F288 IgE
A low or undetectable result makes an IgE-mediated blueberry allergy less likely, but it does not fully rule it out. False negatives can happen, especially if your symptoms are mild, intermittent, or related to a different ingredient in a mixed food. If you had a convincing immediate reaction, your clinician may still recommend additional evaluation, such as skin testing or a supervised oral food challenge.
In-range / negative Blueberry F288 IgE
Many labs report this test as negative versus positive rather than “optimal.” A negative result is most reassuring when your symptoms are not strongly suggestive of an immediate allergic reaction. If you are considering reintroducing blueberries after avoidance, discuss a plan with your clinician, particularly if you have had swelling, breathing symptoms, or systemic reactions in the past.
High Blueberry F288 IgE
A higher result indicates stronger sensitization, which can increase the likelihood of clinical allergy, especially if you have rapid symptoms after blueberry exposure. The number still does not predict reaction severity on its own, and severe reactions can occur at lower levels in some people. If you have had systemic symptoms (hives beyond the mouth, wheeze, throat tightness, faintness), treat this as a prompt to get clinician guidance on avoidance, emergency planning, and whether you need evaluation for related allergens.
Factors that influence Blueberry F288 IgE
Your overall allergic tendency (atopy), seasonal pollen exposure, and other food allergies can affect IgE patterns and sometimes lead to cross-reactivity. Recent reactions do not always cause immediate changes in specific IgE, so timing of testing is not as critical as it is for some other markers, but trends are best interpreted using the same lab method over time. Medications like antihistamines generally do not affect blood IgE results (they can affect skin testing), while immune-modifying therapies may change results over longer periods. Lab cutoffs and reporting units can vary, so compare results using the reference information on your report and focus on clinical correlation.
What’s included
- Blueberry (F288) Ige
Frequently Asked Questions
What does the Blueberry F288 IgE test measure?
It measures the amount of IgE antibodies in your blood that recognize blueberry proteins (allergen code f288). This helps estimate whether an IgE-mediated blueberry allergy is possible when matched to your symptoms and timing.
Do I need to fast for a blueberry IgE blood test?
Fasting is usually not required for specific IgE testing. If you are getting other labs at the same visit, follow the instructions for the full set of tests you ordered.
Can a positive blueberry IgE mean I will definitely react?
No. A positive result indicates sensitization, not certainty of symptoms. Your clinician weighs the result against your history, the type of symptoms, and how quickly they occur after exposure.
Can I have a blueberry allergy with a negative IgE result?
Yes, it is possible, though less likely for classic immediate reactions. If your reaction history is convincing, your clinician may recommend additional testing or a supervised oral food challenge rather than relying on a single negative blood test.
Is this test the same as a food intolerance test?
No. IgE testing evaluates an allergy-type immune pathway that can cause rapid symptoms. Food intolerance is often non-IgE and may involve delayed symptoms, dose effects, or digestive mechanisms that this test does not measure.
How soon after a reaction should I test?
You can usually test at any time because specific IgE reflects longer-term sensitization rather than a short-lived spike. If you are tracking changes over time, it is most useful to repeat testing consistently (same method and lab) and interpret trends with your clinician.
What follow-up tests are commonly considered with a blueberry IgE result?
Depending on your symptoms, clinicians may consider skin prick testing, broader food-specific IgE testing for other suspected ingredients, and evaluation for pollen allergies that can drive cross-reactive oral symptoms. The best next step depends on whether your symptoms are localized to the mouth or involve systemic signs like hives or breathing issues.