Blackberry F211 IgE (Allergen-Specific IgE) Blood Biomarker Testing
It measures IgE antibodies to blackberry to assess allergy risk, with results you can review in PocketMD and order through Vitals Vault labs via Quest.
With Vitals Vault, you have access to a comprehensive range of biomarker tests.
A Blackberry F211 IgE test looks for allergy-type antibodies (IgE) that your immune system may make in response to blackberry proteins. It is a blood test used to support evaluation of possible food allergy or cross-reactive pollen-food symptoms.
A positive result does not automatically mean you will react when you eat blackberries, and a negative result does not fully rule out a reaction. Your history matters, including what happened, how fast symptoms started, and whether you have pollen allergies.
This test is most useful when you pair it with your symptoms and a plan for next steps, such as targeted avoidance, supervised reintroduction, or additional allergy testing guided by a clinician.
Do I need a Blackberry F211 IgE test?
You may consider Blackberry F211 IgE testing if you notice repeat symptoms after eating blackberries, especially within minutes to a couple of hours. Symptoms can include mouth or throat itching, lip swelling, hives, flushing, wheezing, coughing, nausea, vomiting, or lightheadedness. If you have ever had trouble breathing, fainting, or rapidly spreading hives after a food, treat that as urgent and discuss emergency planning with a clinician.
This test can also be helpful when your reactions are inconsistent and you are trying to separate “true” food allergy from cross-reactivity. For example, people with seasonal pollen allergies can develop oral allergy syndrome (pollen-food allergy syndrome), where raw fruits trigger mouth and throat itching but cooked forms may be tolerated.
You might not need this test if you have never had symptoms with blackberry and you are only curious. Broad food IgE screening without a symptom story can create confusing results and unnecessary restriction.
Use your result to support clinician-directed care rather than self-diagnosis. The goal is to match the lab finding to your real-world reactions and decide what is safe for you.
This is a CLIA-lab allergen-specific IgE blood test; results indicate sensitization risk and should be interpreted with your history, not used as a standalone diagnosis of food allergy.
Lab testing
Order labs to measure Blackberry (f211) IgE
from $16.99 at Quest Diagnostics
About 1 week
Schedule online — results typically within a week
Clear next steps
Guidance included, with follow-up care available
HSA / FSA
Eligible for pre-tax health spending accounts
Get this test with Vitals Vault
Vitals Vault lets you order Blackberry F211 IgE testing without a referral and complete your blood draw at a local Quest location. If you are comparing options, this is a straightforward way to confirm whether blackberry is a likely trigger worth addressing.
After results post, PocketMD can help you translate the number into practical next steps, such as when a food diary is enough, when you should add related allergen tests, and when you should talk with an allergist about supervised oral food challenge or an emergency action plan.
If you are tracking symptoms over time, you can also retest in a consistent way (same lab network and similar timing) to see whether sensitization is stable, rising, or falling—especially after changes like pollen season, pregnancy, or medication adjustments.
- Order online and draw at Quest locations
- Clear result context with PocketMD follow-up questions
- Easy reorders when you and your clinician decide to retest
Key benefits of Blackberry F211 IgE testing
- Helps assess whether your immune system is sensitized to blackberry (IgE-mediated risk).
- Adds objective data when symptoms are real but the trigger food is uncertain.
- Supports safer decision-making about avoidance versus supervised reintroduction.
- Can clarify whether reactions may fit oral allergy syndrome rather than classic food allergy.
- Helps you and your clinician decide if you need broader berry, pollen, or component-style follow-up testing.
- Provides a baseline value you can trend if symptoms change or after a significant exposure period.
- Pairs well with PocketMD guidance so your result is interpreted in context, not in isolation.
What is Blackberry F211 IgE?
Blackberry F211 IgE is a blood test that measures the amount of immunoglobulin E (IgE) antibodies in your blood that bind to blackberry allergen extracts. IgE is the antibody class involved in immediate-type allergic reactions, which can range from mild itching to hives or, rarely, anaphylaxis.
The “F211” label is a lab coding convention used for allergen-specific IgE assays. Your result is typically reported as a concentration (often kU/L) and may also be grouped into a semi-quantitative “class” category. Higher values generally suggest a higher likelihood of clinical reactivity, but the number does not perfectly predict reaction severity.
Because many plant foods share similar proteins, a positive blackberry IgE can sometimes reflect cross-reactivity rather than a primary blackberry allergy. This is one reason your symptom pattern and your other allergy history (like birch, grass, or weed pollen allergies) are so important when interpreting the test.
Sensitization vs. allergy
Sensitization means your immune system has made IgE that recognizes a food. Allergy means you actually develop reproducible symptoms when you eat the food. You can be sensitized without being clinically allergic, especially when cross-reactive pollen proteins are involved.
Why berries can be tricky
Berries can trigger different patterns, including mild mouth itching (often linked to pollen-food cross-reactivity) or more systemic symptoms. Mixed dishes, processing (raw vs. cooked), and co-factors like exercise or alcohol can also change whether you react.
What do my Blackberry F211 IgE results mean?
Low Blackberry F211 IgE
A low or undetectable result means the test did not find significant IgE binding to blackberry in your blood. This lowers the likelihood of an IgE-mediated blackberry allergy, but it does not completely rule it out. If your symptoms are convincing, your clinician may consider repeat testing, testing for related allergens, or a supervised oral food challenge.
In-range / expected Blackberry F211 IgE
For allergen-specific IgE, there is not a single “optimal” number the way there is for cholesterol or thyroid tests. Many people will have results that are negative or very low, which is generally expected if you tolerate blackberries. If you have mild mouth symptoms only, your clinician may interpret a borderline result as possible cross-reactivity and focus on your overall pollen allergy picture.
High Blackberry F211 IgE
A higher result suggests stronger sensitization and a higher probability that blackberry could trigger symptoms, especially if you have reacted in the past. The value still cannot predict how severe a reaction would be, so do not use the number to “test” your limits on your own. If you have had systemic symptoms (hives, breathing symptoms, vomiting, dizziness), discuss avoidance and emergency planning with a clinician and consider evaluation by an allergist.
Factors that influence Blackberry F211 IgE
Your result can be influenced by your overall atopic tendency (eczema, asthma, allergic rhinitis), recent pollen exposure, and cross-reactive sensitizations to related plant proteins. Medications like antihistamines do not usually change blood IgE results, but they can mask symptoms and make your history harder to interpret. Age, pregnancy, and timing relative to allergy seasons can also shift IgE patterns, which is why retesting is best done with consistent timing and a clear reason.
What’s included
- Blackberry (F211) Ige
Similar or related tests
Frequently Asked Questions
What does the Blackberry F211 IgE test measure?
It measures allergen-specific IgE antibodies in your blood that bind to blackberry proteins. This helps estimate the likelihood that blackberry could trigger an IgE-mediated allergic reaction when interpreted alongside your symptom history.
Do I need to fast before a blackberry IgE blood test?
Fasting is not required for allergen-specific IgE testing. You can usually test at any time of day unless your clinician or your lab order includes other tests that do require fasting.
Can antihistamines affect Blackberry F211 IgE results?
Antihistamines typically do not change blood IgE levels, so they usually do not affect the lab result. They can reduce symptoms, which may make it harder to connect exposures to reactions, so it helps to document what you took and when.
If my Blackberry F211 IgE is positive, does that mean I’m definitely allergic?
Not necessarily. A positive result indicates sensitization, which can occur without clinical allergy, especially due to cross-reactivity with pollens. Your clinician will weigh the result against your reaction history and may recommend additional testing or a supervised oral food challenge.
If my result is negative, can I still react to blackberries?
Yes. A negative result makes an IgE-mediated allergy less likely, but reactions can still occur for other reasons, and rare false negatives happen. If you have had convincing symptoms, discuss next steps with a clinician rather than relying on the lab alone.
How soon after a reaction should I test?
You can often test soon after symptoms, but timing is not as critical as it is for some other immune markers. If your exposure was recent and your history is unclear, your clinician may suggest waiting and retesting later or adding related allergen tests to improve clarity.
Should I retest Blackberry F211 IgE, and when?
Retesting is most useful when it will change a decision, such as considering reintroduction, monitoring a known allergy over time, or reassessing after major changes like pregnancy or a shift in seasonal allergy control. Many people retest in 6–12 months when trending is clinically relevant, but your situation may differ.