Profilin T216 IgE Biomarker Testing
It measures IgE sensitization to profilin, a cross-reactive plant protein; order through Vitals Vault with Quest lab access and PocketMD support.
With Vitals Vault, you have access to a comprehensive range of biomarker tests.
A positive allergy blood test can feel straightforward, but allergen-specific IgE results often need context. Profilin T216 IgE is a targeted test that helps explain why you might react to many different fruits, vegetables, or pollens even when the exposures seem unrelated.
Profilin is a “pan-allergen” found across many plants. If you are sensitized to profilin, your immune system can recognize similar proteins in multiple pollens and foods, which can show up as broad, confusing positives on testing.
This test is most useful when your symptoms, season, and exposure history suggest pollen-food syndrome (also called oral allergy syndrome) or when you have multiple low-level positives and you want to understand whether cross-reactivity is part of the story.
Do I need a Profilin T216 IgE test?
You may consider Profilin T216 IgE testing if you get itching, tingling, or mild swelling of the lips, mouth, or throat after eating raw fruits or vegetables, especially during pollen season. Those symptoms often point toward pollen-food syndrome, where your immune system reacts to similar proteins shared between pollens and plant foods.
This test can also help when your allergy workup shows many positive plant-related IgE results that do not match your real-life reactions. A profilin sensitization pattern can make several different pollen and food tests look positive, even if only a few exposures actually trigger symptoms.
You might also benefit if you are deciding how to interpret borderline allergen-specific IgE results, whether to pursue component testing, or whether avoidance is truly necessary. Testing is most helpful when it supports clinician-directed care and your personal symptom history, rather than being used to self-diagnose an allergy.
This is a laboratory-developed, CLIA-validated allergen-specific IgE blood test; results indicate sensitization and must be interpreted alongside your symptoms and clinical history.
Lab testing
Order Profilin T216 IgE through Vitals Vault and test at a Quest location when it fits your schedule.
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 Profilin T216 IgE testing without needing to coordinate a separate lab requisition. You complete checkout, visit a participating Quest location for a simple blood draw, and then review your result in your Vitals Vault dashboard.
Because profilin is a cross-reactive allergen, the “why” matters as much as the number. PocketMD can help you put your result in context with your symptoms, the time of year, and any other allergy results you have, so you can decide what to do next (for example, whether broader aeroallergen testing or targeted component testing makes sense).
If you are tracking symptoms over time, you can also use Vitals Vault to recheck the same marker later, which can be useful when your exposures change or when you want a consistent lab record.
- Order online and test at a Quest draw site
- Results you can revisit and trend in one place
- PocketMD support for next-step questions
Key benefits of Profilin T216 IgE testing
- Helps explain broad, multi-pollen or multi-food IgE positivity that may be driven by cross-reactivity.
- Supports evaluation of pollen-food syndrome when mouth or throat symptoms happen with raw plant foods.
- Adds context when your symptoms do not match the specific foods or pollens that tested positive.
- Can help you prioritize which positives are more likely to be clinically meaningful versus “background” sensitization.
- Guides conversations about whether component-resolved testing could clarify true risk for systemic reactions.
- Improves seasonal interpretation by linking symptoms and exposures to a cross-reactive plant protein pattern.
- Creates a baseline you can recheck if your environment, diet, or allergy management plan changes.
What is Profilin T216 IgE?
Profilin is a small protein found in many plants, including pollens and a wide range of fruits and vegetables. Because profilins are structurally similar across different species, your immune system can mistake one plant’s profilin for another. That is why profilin is often called a cross-reactive “pan-allergen.”
Profilin T216 IgE measures whether you have immunoglobulin E (IgE) antibodies that recognize profilin. A positive result means sensitization, which is your immune system’s ability to bind to that protein. Sensitization is not the same as a clinically important allergy, which requires a consistent pattern of symptoms after exposure.
In practice, profilin sensitization is commonly associated with pollen-food syndrome. Symptoms are often localized to the mouth and throat and are more likely with raw foods than cooked foods, because heating can change the protein structure. However, your personal risk depends on your overall allergy profile, the specific foods involved, and your reaction history.
Sensitization vs. allergy: why the distinction matters
IgE tests detect immune recognition, not severity. You can have a positive profilin IgE and never notice symptoms, or you can have symptoms with only a modest level. Your history—what happens when you eat the food, how quickly symptoms start, and whether symptoms repeat—often matters more than the exact number.
How this fits with other allergy testing
Profilin testing is usually interpreted alongside other allergen-specific IgE results (such as tree, grass, and weed pollens) and sometimes alongside component testing for specific foods. If your pattern suggests cross-reactivity, it can prevent unnecessary long-term avoidance of foods that you tolerate.
What do my Profilin T216 IgE results mean?
Low or undetectable Profilin T216 IgE
A low or undetectable result suggests you are not sensitized to profilin, so profilin-driven cross-reactivity is less likely to explain broad plant-related positives. If you still have mouth or throat symptoms with raw foods, other cross-reactive proteins (such as PR-10 proteins or lipid transfer proteins) may be more relevant. A low result does not rule out allergy to a specific food or pollen, because you can be sensitized to other components.
In-range (negative) results in the context of symptoms
For allergen-specific IgE, “optimal” usually means negative—your immune system is not showing measurable IgE binding to profilin on this assay. If your symptoms are seasonal and you react to raw fruits or vegetables, a negative profilin result can help narrow the differential toward other pollen-related components. Your clinician may still consider skin testing, other specific IgE tests, or supervised food challenges depending on your history.
High (positive) Profilin T216 IgE
A positive result indicates profilin sensitization and increases the likelihood that some of your other plant-related IgE positives are due to cross-reactivity. Many people with profilin sensitization have mild, localized symptoms (like oral itching) rather than severe systemic reactions, but your personal risk depends on the foods involved and your past reactions. A positive result is most meaningful when it matches your story—for example, symptoms that cluster around pollen season or reactions to multiple raw plant foods that improve when foods are cooked.
Factors that influence Profilin T216 IgE
Your result can be influenced by your overall atopic tendency (such as eczema, allergic rhinitis, or asthma) and by the intensity of pollen exposure in your environment. Timing matters too: symptoms often flare during relevant pollen seasons even if the IgE number itself does not change dramatically. Medications like antihistamines generally do not affect blood IgE levels (they affect symptoms), but recent allergen immunotherapy, infections, and lab-to-lab method differences can complicate interpretation. Most importantly, the same IgE level can mean different things in different people, so your reaction history should guide decisions.
What’s included
- Profilin (T216) Ige
Frequently Asked Questions
What does a positive Profilin T216 IgE mean?
It means you are sensitized to profilin, a cross-reactive plant protein found in many pollens and plant foods. This can help explain multiple low-level positives on other pollen or food IgE tests. It does not automatically mean you will have symptoms or that you must avoid specific foods.
Is profilin the same as oral allergy syndrome (pollen-food syndrome)?
Profilin is one possible trigger pattern for pollen-food syndrome, but it is not the only one. Pollen-food syndrome describes the symptom pattern (often mouth and throat itching with raw foods), while profilin is a specific protein family that can drive cross-reactivity. Other components can cause similar symptoms, so your full test pattern and history matter.
Can Profilin T216 IgE explain why I test positive to many fruits and vegetables?
Yes, it can. Profilin sensitization can make multiple plant food IgE tests appear positive because the immune system recognizes similar profilin proteins across species. The key is whether those positives match real reactions when you eat the foods.
Do I need to fast for a Profilin IgE blood test?
Fasting is not typically required for allergen-specific IgE testing. You can usually eat and drink normally unless your clinician or your lab order includes other tests that require fasting.
Can antihistamines affect my Profilin T216 IgE result?
Antihistamines generally do not change allergen-specific IgE levels in your blood, but they can reduce symptoms and may affect skin testing results. If you are doing both blood testing and skin testing, ask your clinician about medication timing for the skin test portion.
What is a normal range for Profilin T216 IgE?
Most labs report allergen-specific IgE as a concentration with a negative threshold and sometimes an associated class (such as class 0–6). The exact cutoffs can vary by assay and lab, so use the reference range shown on your report. Interpreting “normal” also depends on whether you have symptoms with relevant exposures.
Should I avoid foods if my Profilin T216 IgE is high?
Not automatically. Avoidance decisions should be based on your reaction history and the specific foods involved, not the IgE number alone. If you have had systemic symptoms (such as hives beyond the mouth, vomiting, wheezing, or faintness), seek clinician guidance promptly; you may need a more detailed evaluation.