Cashew Nut (F202) IgE Blood Biomarker Testing
It measures IgE antibodies to cashew to assess allergy risk and guide next steps, with easy ordering and Quest lab access through Vitals Vault.
With Vitals Vault, you have access to a comprehensive range of biomarker tests.
A Cashew Nut (F202) IgE test is a blood test that looks for allergy antibodies (immunoglobulin E, IgE) directed at cashew proteins. It helps estimate whether your immune system is sensitized to cashew, which can be associated with allergic reactions.
This test is most useful when you have a history that raises suspicion for a cashew allergy, such as hives, swelling, vomiting, wheezing, or throat tightness after eating cashew or foods that may contain it. It can also help clarify risk when you are avoiding cashew because of a prior reaction or because you have other nut allergies.
Your number is not a “yes/no” diagnosis by itself. The result needs to be interpreted alongside your symptoms and exposure history, and sometimes alongside other allergy tests, to decide whether strict avoidance, an epinephrine plan, or a supervised food challenge makes sense.
Do I need a Cashew Nut F202 IgE test?
You may want this test if you have had symptoms soon after eating cashew, such as hives, lip or eyelid swelling, itching in the mouth, stomach pain, vomiting, cough, wheeze, or feeling faint. Timing matters: IgE-type reactions usually start within minutes to a couple of hours after exposure.
It can also be helpful if you have a known tree nut allergy and you are trying to understand whether cashew is likely to be a problem for you too. Cashew allergy can be associated with reactions to pistachio because the proteins can be similar, so your clinician may consider broader nut testing depending on your situation.
You might not need cashew-specific IgE if your symptoms are clearly not allergy-like (for example, delayed symptoms the next day) or if you are testing “just to see” without any relevant history. In those cases, false positives (sensitization without real-world reactions) can create unnecessary food avoidance.
If you are pregnant, have asthma, have had a severe reaction, or are considering reintroducing cashew after avoidance, testing can support a safer, clinician-directed plan. If you think you may be at risk for anaphylaxis, do not use a lab result to decide whether it is safe to try cashew at home.
This is a CLIA laboratory blood test for allergen-specific IgE; results support clinical decision-making but do not diagnose allergy on their own.
Lab testing
Order Cashew Nut (F202) IgE through Vitals Vault and complete your blood draw at a nearby 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
Vitals Vault makes it straightforward to order a Cashew Nut (F202) IgE blood test when you and your clinician want objective data to pair with your symptom history. You can choose the test, schedule a blood draw, and get a clear lab report you can share.
Once your result is back, PocketMD can help you put the number into context, including what “sensitization” means, what follow-up questions to ask, and when it may be reasonable to retest. If your history suggests higher risk, PocketMD can also help you prepare for a clinician visit with a focused summary.
If your situation calls for broader mapping, you can add related allergy tests or general health labs through Vitals Vault so you are not making decisions based on a single data point.
- Order online and complete your draw through the Quest network
- Clear, shareable results with context for next steps
- PocketMD support to help you interpret and plan follow-up
Key benefits of Cashew Nut F202 IgE testing
- Helps identify immune sensitization to cashew when your symptoms suggest an IgE-type food allergy.
- Supports safer decision-making about avoidance versus supervised reintroduction with a clinician.
- Adds objective data when your history is unclear or exposures were mixed (for example, baked goods or sauces).
- Can be trended over time to support follow-up planning, especially in children where allergies may change.
- Helps your clinician assess whether broader tree nut testing may be useful based on your pattern of sensitization.
- Reduces guesswork when you are trying to distinguish allergy from intolerance or unrelated GI symptoms.
- Pairs well with PocketMD guidance so you can translate a lab number into practical next steps.
What is Cashew Nut (F202) IgE?
Cashew Nut (F202) IgE is a blood measurement of allergen-specific IgE antibodies directed at cashew proteins. IgE is the antibody class involved in immediate-type allergic reactions. When you are sensitized, your immune system has made IgE that can recognize cashew, and that IgE can trigger release of histamine and other mediators during exposure.
The test does not measure how “severe” your next reaction will be. Instead, it estimates the likelihood that your immune system will react in an IgE-mediated way when you encounter cashew. Some people have a positive IgE result but tolerate cashew, while others have low-level IgE and still react, so your symptoms and history remain central.
Cashew is a tree nut, and allergy to cashew can be persistent and sometimes associated with more significant reactions. Because of protein similarity, clinicians often think about pistachio alongside cashew, and they may also consider total IgE, other food-specific IgE tests, or skin testing depending on your risk profile.
Sensitization vs. clinical allergy
A positive cashew IgE means sensitization, which is evidence your immune system recognizes cashew. Clinical allergy means you actually develop reproducible symptoms with exposure. The gap between these two is why your clinician may use your history, other tests, and sometimes a supervised oral food challenge to confirm what the result means for you.
Why the code “F202” matters
“F202” is the laboratory identifier for cashew in many allergen-specific IgE testing systems. It helps ensure the lab is measuring IgE to the intended allergen source, which is important when you compare results across time or across different reports.
What do my Cashew Nut F202 IgE results mean?
Low Cashew Nut (F202) IgE
A low or undetectable result makes an IgE-mediated cashew allergy less likely, especially if you have eaten cashew recently without symptoms. However, it does not fully rule out allergy, because timing, lab method, and individual immune patterns can affect results. If your reaction history is convincing, your clinician may still recommend additional evaluation rather than a home trial.
In-range / negative-range Cashew Nut (F202) IgE
Many labs report a reference interval where results below a cutoff are considered negative or unlikely to represent sensitization. If your result falls in that range and your history is also low-risk, it often supports continued normal diet or cautious reassurance. If you have been strictly avoiding cashew for a long time, your clinician may interpret a negative result more carefully and may discuss supervised reintroduction rather than self-testing.
High Cashew Nut (F202) IgE
A higher result suggests stronger sensitization and increases the likelihood of true clinical allergy, particularly when you have had immediate symptoms after exposure. It still cannot predict exactly how severe a reaction would be, and it should not be used to decide that a home exposure is safe. If your result is high, your clinician may discuss strict avoidance, cross-contact precautions, and whether you should have an emergency action plan.
Factors that influence Cashew Nut (F202) IgE
Your age, recent exposures, and overall allergy burden can influence specific IgE levels. Having eczema, allergic rhinitis, asthma, or multiple allergies can be associated with higher total IgE and sometimes more frequent low-level positives. Cross-reactivity with related foods (notably pistachio) can contribute to sensitization patterns, and different labs or methods can yield slightly different numeric values. Medications like antihistamines generally do not change blood IgE results, but they can mask symptoms, which affects how your history is interpreted.
What’s included
- Cashew Nut (F202) Ige
Frequently Asked Questions
Do I need to fast for a Cashew Nut (F202) IgE blood test?
Fasting is not usually required for allergen-specific IgE testing. If you are combining this with other labs that do require fasting (such as certain lipid tests), follow the instructions for the full order.
What does a positive cashew IgE test mean?
A positive result means your immune system has made IgE antibodies that recognize cashew (sensitization). It increases the likelihood of a true allergy, but it does not confirm that you will have symptoms with exposure. Your history and, when appropriate, clinician-supervised testing determine whether it is a clinical allergy.
Can a negative cashew IgE test rule out a cashew allergy?
A negative or very low result makes IgE-mediated cashew allergy less likely, but it is not a perfect rule-out. If you had a convincing immediate reaction, your clinician may still recommend further evaluation rather than relying on one blood test.
Does the IgE number predict how severe my reaction will be?
Not reliably. Higher IgE levels can correlate with a higher chance of reacting, but they do not predict whether a reaction will be mild or severe. Other factors, including asthma control, amount eaten, and co-factors like exercise or illness, can influence reaction severity.
How is cashew IgE different from a skin prick test?
Cashew IgE is measured in blood, while a skin prick test measures a local skin response to an allergen extract. Both can indicate sensitization, and neither alone proves clinical allergy. Clinicians choose based on your history, access, and whether they need additional detail from a broader allergy evaluation.
If I’m allergic to cashews, am I automatically allergic to pistachios or other tree nuts?
Not automatically, but cashew and pistachio can be closely related, and co-allergy is common. Some people react to multiple tree nuts, while others react to only one. Your clinician may recommend targeted testing rather than avoiding all nuts without evidence.
When should I retest cashew IgE?
Retesting is individualized. If you are monitoring whether an allergy is changing over time (often in children), clinicians may recheck periodically, such as annually or every couple of years, depending on prior results and reaction history. Retesting is also considered before a supervised food challenge or planned reintroduction.