Sole Rf337 IgE test (specific IgE) Biomarker Testing
It measures IgE sensitization to sole (Rf337) to help assess allergy risk and guide next steps, with easy ordering and Quest draw sites via Vitals Vault.
With Vitals Vault, you have access to a comprehensive range of biomarker tests.
Sole Rf337 IgE is a blood test that looks for allergy-type antibodies (IgE) that recognize proteins from sole, a type of flatfish. It is most useful when you are trying to connect symptoms after eating fish with an immune pattern that could fit an IgE-mediated food allergy.
Your result does not diagnose an allergy by itself, because people can have measurable IgE without reacting when they eat the food. The test is best used alongside your symptom history and, when appropriate, guidance from a clinician.
If you already have a result in hand, the most important next step is interpreting it in context: what you ate, how quickly symptoms started, how severe they were, and whether you tolerate other fish.
Do I need a Sole Rf337 IgE test?
You may want this test if you have symptoms that reliably happen soon after eating sole or foods that might contain sole (for example, mixed seafood dishes). IgE-mediated reactions often begin within minutes to a couple of hours and can include hives, itching, lip or tongue swelling, throat tightness, wheezing, vomiting, or lightheadedness.
This test can also be helpful if you have a known fish allergy and you are trying to clarify whether sole is a likely trigger, or if you have had an unexplained reaction after eating at a restaurant where cross-contact with fish is possible.
You may not need a sole-specific IgE test if your symptoms are delayed (many hours later), limited to mild digestive discomfort without other allergic features, or if you eat sole regularly without problems. In those cases, other explanations—such as food intolerance, histamine sensitivity, food poisoning, or reflux—may fit better.
Testing supports clinician-directed care and safety planning, but it is not meant for self-diagnosis. If you have had breathing symptoms, fainting, or rapid progression of symptoms after eating fish, treat that as urgent and discuss an emergency action plan with a clinician.
This is a laboratory-developed immunoassay performed in a CLIA-certified lab; results indicate sensitization (IgE presence) and must be interpreted with your history, not used as a standalone diagnosis.
Lab testing
Order Sole Rf337 IgE and schedule your draw
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 Sole Rf337 IgE directly, then complete your blood draw at a nearby Quest draw site. Your report shows the measured specific IgE value and the lab’s reference interpretation so you can review it with your clinician.
If you are comparing options, this test works well as a targeted check when you suspect sole specifically. If your reactions are less clear, you may prefer pairing it with other fish or food markers so you can see patterns rather than guessing.
After your results post, you can use PocketMD to talk through what the number may mean for your symptoms, whether retesting makes sense, and which companion tests could reduce uncertainty before you make diet changes.
- Order online and use a nationwide Quest draw network
- Clear, shareable results you can bring to your clinician
- PocketMD guidance for next-step planning and retest timing
Key benefits of Sole Rf337 IgE testing
- Helps assess whether your immune system is sensitized to sole proteins when reactions follow fish exposure.
- Adds objective data to your symptom history, which is often the deciding factor in allergy risk assessment.
- Can support safer decision-making about avoidance, restaurant exposure, and cross-contact concerns.
- Helps differentiate “possible allergy” from other causes of symptoms when the timing and pattern are unclear.
- Provides a baseline value you can trend over time if your clinician recommends monitoring.
- Can guide smarter follow-up testing (other fish, shellfish, or environmental allergens) instead of broad, unfocused panels.
- Pairs well with PocketMD interpretation so you understand what the result can and cannot tell you.
What is Sole Rf337 IgE?
Sole Rf337 IgE is a specific IgE blood test. “IgE” (immunoglobulin E) is the antibody class involved in classic immediate-type allergic reactions. “Rf337” refers to the lab’s allergen code for sole.
The test measures how much IgE in your blood binds to sole proteins. A detectable result suggests sensitization, meaning your immune system recognizes the allergen. Sensitization is not the same as a confirmed clinical allergy, because not everyone with measurable IgE will have symptoms when they eat the food.
Your clinician typically interprets this result by combining it with your reaction history (what happened, how fast, and how severe), your ability to tolerate other fish, and sometimes additional testing such as other fish-specific IgE tests or supervised oral food challenges when appropriate.
Sensitization vs. allergy: why the distinction matters
A positive specific IgE result means your immune system has made IgE that can recognize sole, but it does not prove you will react. The likelihood of a true allergy generally increases when the result is higher and your symptoms are consistent with an IgE-mediated reaction, but there is no single cutoff that guarantees a reaction for every person.
How this fits into fish allergy evaluation
Fish allergy can involve cross-reactivity between different fish species, but it is not uniform. Some people react to many fish, while others react to only one or a few. A sole-specific IgE test is most helpful when your question is narrow: “Is sole a likely trigger for me?”
What do my Sole Rf337 IgE results mean?
Low or undetectable Sole Rf337 IgE
A low or undetectable result makes IgE-mediated sole allergy less likely, especially if you have eaten sole recently without symptoms. However, it does not completely rule out allergy, because timing, lab thresholds, and individual immune patterns can affect detectability. If your reaction history is strong (rapid onset hives, swelling, breathing symptoms), your clinician may still recommend further evaluation rather than reintroducing sole on your own.
In-range / negative result (typical reference interpretation)
Many labs report a “negative” or “class 0” style interpretation when the value is below a defined threshold. In practical terms, this usually supports the idea that sole is not a major IgE trigger for you, but your symptoms and exposure details still matter. If you are avoiding fish broadly due to uncertainty, a negative result can be one piece of evidence to help narrow the focus to other fish species or non-allergic causes.
High Sole Rf337 IgE
A higher result indicates stronger sensitization to sole and increases concern for an IgE-mediated reaction, particularly if your symptoms occur quickly after exposure. It still cannot predict severity on its own, because severe reactions can occur at lower values and some people with higher values may not react. If you have had systemic symptoms (wheezing, throat tightness, faintness), discuss an emergency plan and strict avoidance guidance with a clinician.
Factors that influence Sole Rf337 IgE results
Your total allergic tendency (atopy), including eczema, asthma, or allergic rhinitis, can raise the chance of detectable specific IgE. Recent exposures do not always change the number quickly, but immune activity over time can shift results, which is why trending may be useful in select cases. Cross-reactivity with proteins from other fish can contribute to a positive result even if sole is not the true trigger. Medications like antihistamines do not typically lower specific IgE levels, but immunotherapy decisions and clinical context can affect how the result is used.
What’s included
- Sole (F337) Ige
Frequently Asked Questions
Do I need to fast for a Sole Rf337 IgE blood test?
Fasting is usually not required for specific IgE testing. If you are doing other labs at the same time, follow the instructions for the full set of tests you ordered.
Does a positive Sole IgE mean I am definitely allergic to sole?
Not necessarily. A positive result shows sensitization (IgE is present), but a true food allergy diagnosis depends on your symptom history and, in some cases, additional evaluation. Your clinician may weigh the result alongside reaction timing, severity, and whether you tolerate other fish.
Can antihistamines affect my specific IgE result?
Antihistamines generally do not change specific IgE blood test results. They can affect skin testing, but blood-based IgE measurements are typically not altered by taking an antihistamine.
What is the difference between specific IgE and total IgE?
Specific IgE measures IgE antibodies directed at one allergen (here, sole). Total IgE measures the overall amount of IgE in your blood, which can be elevated for many reasons and does not identify the trigger.
If my Sole IgE is negative, can I safely eat sole?
A negative result lowers the likelihood of an IgE-mediated sole allergy, but it is not a guarantee of safety. If you have had rapid-onset or severe reactions after fish exposure, do not reintroduce sole without clinician guidance.
How often should I retest Sole Rf337 IgE?
Retesting is individualized. If you are monitoring a known allergy, clinicians often consider repeating testing after a meaningful interval (commonly many months to a year) rather than frequently, because IgE levels usually change gradually. Retest timing should reflect your history, age, and whether a supervised food challenge is being considered.