Fig (Ficus carica) F328 IgE blood test (F328) Biomarker Testing
It measures IgE antibodies to fig to assess allergy sensitization, with clear next steps and easy ordering through Vitals Vault using Quest labs.
With Vitals Vault, you have access to a comprehensive range of biomarker tests.
This test measures whether your immune system has made IgE antibodies to fig (Ficus carica), reported as “F328.” It is one piece of evidence that can support an IgE‑mediated food allergy evaluation.
A positive result does not automatically mean you will react when you eat figs, and a negative result does not fully rule out a reaction. Your symptoms, timing, and exposure history matter just as much as the number.
If you are trying to decide whether to avoid fig, whether you need broader allergy testing, or how to interpret a result you already have, this page walks you through what the test can and cannot tell you and what usually comes next.
Do I need a Fig Ficus Carica F328 IgE test?
You may consider fig-specific IgE testing if you get symptoms soon after eating fresh or dried fig, such as itching or tingling in the mouth, lip or tongue swelling, hives, flushing, nausea, vomiting, wheezing, or throat tightness. The test can also be useful if you have had an unexplained allergic reaction and fig is one of several suspected triggers.
This test is especially relevant if your reactions seem tied to raw fruits or certain pollens (often called pollen-food allergy syndrome or oral allergy syndrome). Some people react to fig because their IgE recognizes similar proteins found in pollens or other plants, which can make symptoms show up seasonally or mainly with raw foods.
You might also order it if you are building a clearer allergy map because you have multiple food reactions, eczema, asthma, or allergic rhinitis, and you want to prioritize which foods to evaluate more carefully.
Testing supports clinician-directed care and shared decision-making. It is not a stand-alone diagnosis, and you should not use a single lab value to decide whether to attempt a home “challenge” if you have had significant reactions.
This is a blood-based allergen-specific IgE test typically performed in a CLIA-certified laboratory; results indicate sensitization and must be interpreted with your history, not as a diagnosis by themselves.
Lab testing
Order Fig (F328) IgE testing and get results you can review with your clinician.
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
Vitals Vault lets you order fig (F328) specific IgE testing without needing to coordinate the logistics yourself. You can choose a focused single-analyte test when fig is the main question, or you can pair it with related allergy markers when you need a broader picture.
After your results are in, PocketMD can help you translate the report into practical next steps to discuss with your clinician—such as whether your pattern fits oral allergy syndrome, whether you should add other suspected foods or environmental allergens, and when retesting makes sense.
If you are tracking symptoms over time, Vitals Vault also makes it easier to repeat the same test later so you can compare results under similar conditions (for example, after a period of avoidance or after changes in allergy treatment).
- Order online and complete your blood draw through the Quest lab network
- Clear, patient-friendly result context with PocketMD
- Easy reordering for follow-up testing and trend tracking
Key benefits of Fig Ficus Carica F328 IgE testing
- Helps identify whether you are sensitized to fig as a potential trigger for immediate-type allergic symptoms.
- Supports evaluation of mouth/throat itching after raw fruit that may fit pollen-food allergy syndrome patterns.
- Adds objective data when your reaction history is unclear or when multiple foods are possible culprits.
- Helps guide whether broader food or environmental allergy testing is worth adding next.
- Can inform risk discussions about future exposures when you have had hives, swelling, or breathing symptoms.
- Provides a baseline value you can compare over time if your clinician recommends follow-up testing.
- Pairs well with PocketMD guidance so your number is interpreted in context rather than in isolation.
What is Fig Ficus Carica F328 IgE?
Fig Ficus carica F328 IgE is a blood test that measures allergen-specific immunoglobulin E (IgE) antibodies directed against fig. IgE is the antibody class involved in classic “immediate” allergic reactions, where symptoms can start within minutes to a couple of hours after exposure.
A detectable fig-specific IgE level means your immune system has been sensitized to fig proteins. Sensitization increases the likelihood of an allergic reaction, but it does not guarantee one. Some people have measurable IgE and tolerate the food, while others react at low levels.
Your result is typically reported as a concentration (often in kU/L) and may also be grouped into a “class” category by the lab. The most useful interpretation comes from combining the number with your symptom pattern, how much fig you ate, whether the fig was raw vs cooked, and whether you have related pollen or latex allergies.
IgE sensitization vs clinical allergy
Clinical allergy means you reliably develop symptoms with exposure. Sensitization means the immune system recognizes the allergen, but you may or may not react. This is why a positive test is a clue, not a verdict.
Why fig reactions can look different from person to person
Some fig reactions are mild and limited to the mouth (often linked to cross-reactivity with pollens), while others involve hives, swelling, or breathing symptoms. How your immune system recognizes specific fig proteins, plus cofactors like exercise or alcohol around the time you eat, can influence severity.
What do my Fig Ficus Carica F328 IgE results mean?
Low or undetectable fig-specific IgE
A low (or negative) result makes an IgE-mediated fig allergy less likely, but it does not completely rule it out. False negatives can happen, especially if your reaction was not IgE-driven, if the timing and symptoms suggest a different mechanism, or if the relevant allergen proteins are not well represented in the test extract. If your history includes clear, immediate reactions, your clinician may still consider skin testing, broader panels, or a supervised oral food challenge.
In-range results (interpretation depends on your lab’s reference range)
For specific IgE tests, “in range” often means the lab did not detect sensitization above its cutoff. If you have no symptoms with fig, this is usually reassuring. If you do have symptoms, the next step is to look for other explanations such as cross-reactivity to pollens, reactions to other foods eaten at the same time, or non-allergic intolerance, and to decide whether additional testing is appropriate.
Elevated fig-specific IgE
An elevated result indicates sensitization to fig and increases the probability that fig could be a true trigger, especially when your symptoms occur soon after exposure. Higher values can correlate with higher likelihood of clinical allergy in some foods, but exact “decision points” vary by allergen and by person, and they are not as well established for fig as they are for a few common foods. If you have had systemic symptoms (hives, swelling, wheeze, faintness), treat this as a prompt to review an avoidance and emergency plan with your clinician.
Factors that influence fig IgE results
Your total IgE level and overall allergic tendency (atopy) can affect how likely you are to have low-level positives across multiple allergens. Cross-reactivity with pollens or latex can also drive a positive result even when reactions are mild or limited to raw fruit. Medications like antihistamines usually do not change blood IgE results, but timing, lab methods, and differences between extracts can cause small variations, so repeat testing should ideally be done through the same lab when possible.
What’s included
- Fig (F328) Ige
Frequently Asked Questions
What does the Fig Ficus carica F328 IgE test measure?
It measures allergen-specific IgE antibodies in your blood that recognize fig (Ficus carica). This indicates immune sensitization to fig and can support evaluation of an IgE-mediated food allergy when interpreted alongside your symptoms and history.
Do I need to fast for a fig-specific IgE blood test?
Fasting is not typically required for allergen-specific IgE testing. If you are getting other labs drawn at the same visit, follow the fasting instructions for those tests.
Can a positive fig IgE mean I’m allergic even if I’ve never reacted?
Yes. A positive result can reflect sensitization without clinical allergy, meaning your immune system recognizes fig but you may still tolerate it. Your clinician may use your history and, when appropriate, additional testing to determine whether avoidance is necessary.
Can a negative fig IgE rule out a fig allergy?
Not completely. A negative result lowers the likelihood of an IgE-mediated fig allergy, but it does not exclude non-IgE reactions or rare cases where testing misses the relevant proteins. If your reactions are convincing or severe, discuss next steps such as skin testing or supervised challenge with your clinician.
How soon after a reaction should I test fig IgE?
You can usually test at any time because specific IgE is not a short-lived “spike” like some other markers. If the reaction was very recent and you are also evaluating other causes, your clinician may time testing strategically, but most people can test once the acute event has passed.
What is oral allergy syndrome and how does it relate to fig?
Oral allergy syndrome (pollen-food allergy syndrome) happens when IgE made against pollens cross-reacts with similar proteins in raw fruits or vegetables. It often causes itching or mild swelling in the mouth and throat shortly after eating raw foods. Fig can be involved in cross-reactive patterns, so your fig IgE result may be interpreted alongside your pollen allergy history.
Should I retest fig IgE, and if so, when?
Retesting is most useful when your clinician is monitoring a known allergy over time or reassessing risk after a period of avoidance or symptom change. A common approach is to wait months rather than weeks so that any change is meaningful, and to use the same lab method for better comparability.