Sardine Pilchard Rf308 IgE (Food Allergy) Blood Biomarker Testing
It measures IgE sensitization to sardine/pilchard proteins to support allergy evaluation and follow-up, with convenient ordering through Vitals Vault/Quest.
From $44.99 · Quest Diagnostics
- No subscription
- HSA/FSA eligible
- Most results in 3–5 business days
This test looks for sardine/pilchard-specific IgE antibodies in your blood. IgE is the allergy antibody that can be involved in immediate reactions such as hives, swelling, wheezing, vomiting, or, rarely, anaphylaxis after eating a trigger food.
A positive result does not automatically mean you are “allergic” in the clinical sense. It means your immune system is sensitized to proteins from sardine/pilchard, and your symptoms and history determine whether that sensitization is causing real-world reactions.
If you are trying to decide whether to avoid sardines, clarify a past reaction, or track whether sensitization is changing over time, this test can be a useful piece of the puzzle to review with your clinician or allergist.
Do I need a Sardine Pilchard Rf308 IgE test?
You may want this test if you have had symptoms soon after eating sardines (or foods that may contain sardine/pilchard), especially hives, itching, lip or tongue swelling, throat tightness, coughing, wheezing, dizziness, or repetitive vomiting. It can also help when symptoms are less specific—like unexplained flushing or stomach upset—but the timing with a meal suggests an allergy-type reaction.
This test is also reasonable if you have a known fish allergy and you are trying to understand whether sardine/pilchard might be a risk for you, or if you are comparing tolerance across different fish. Because fish proteins can cross-react, your clinician may use targeted IgE tests to guide avoidance and next steps.
You might not need this test if your symptoms are delayed by many hours, are limited to bloating or chronic digestive discomfort, or are more consistent with food intolerance rather than an IgE-mediated allergy. In those cases, other evaluations may fit better.
Lab testing supports clinician-directed care, but it cannot diagnose a food allergy by itself. Your history, reaction timing, and sometimes supervised oral food challenge are what confirm whether sardine/pilchard truly triggers symptoms.
This is a laboratory-developed specific IgE blood test performed in a CLIA-certified lab; results should be interpreted with your clinical history and are not a standalone diagnosis.
Order labs to measure Sardine, Pilchard (rf308) IgE
from $44.99 at Quest Diagnostics.
Get this test with Vitals Vault
Vitals Vault lets you order sardine/pilchard-specific IgE testing without needing to coordinate lab paperwork on your own. You can choose the test when you are actively investigating a reaction or when you are building a broader allergy workup with your clinician.
After you get your results, PocketMD can help you translate the report into practical next questions, such as whether your pattern suggests true allergy risk, what cross-reactivity might matter, and which companion tests could clarify the picture.
If you are monitoring changes over time—such as after a long period of avoidance or as part of an allergist-directed plan—Vitals Vault makes it easy to reorder and compare trends alongside your symptoms and exposures.
- Order online and complete your blood draw through the Quest network
- Clear, shareable results you can bring to your clinician or allergist
- PocketMD guidance to help you plan sensible follow-up
Key benefits of Sardine Pilchard Rf308 IgE testing
- 01Helps assess whether your immune system is sensitized to sardine/pilchard proteins.
- 02Supports evaluation of immediate, allergy-type reactions after eating fish.
- 03Adds objective data when your history is unclear or exposures were mixed (for example, seafood stews or sauces).
- 04Can be used with other fish and seafood IgE tests to map possible cross-reactivity.
- 05Helps guide risk conversations about avoidance, label reading, and emergency planning with your clinician.
- 06Provides a baseline you can compare against future results if your allergist recommends retesting.
- 07Pairs well with PocketMD to turn a lab number into a practical follow-up plan.
What is Sardine Pilchard Rf308 IgE?
Sardine Pilchard Rf308 IgE is a blood test that measures allergen-specific immunoglobulin E (IgE) directed against proteins from sardine/pilchard. When you are sensitized, your immune system has made IgE that can recognize those proteins.
In an IgE-mediated food allergy, exposure to the trigger food can cause IgE on mast cells and basophils to activate quickly, releasing histamine and other mediators. That is what can lead to rapid symptoms such as hives, swelling, wheezing, or gastrointestinal symptoms.
This test measures sensitization, not the severity of a reaction. Some people have detectable IgE but tolerate the food, while others react strongly with relatively low levels. That is why your result is most useful when it is interpreted alongside your symptom history and any other allergy testing your clinician recommends.
IgE sensitization vs. clinical allergy
A positive specific IgE means your immune system recognizes the allergen, but it does not prove that eating sardine/pilchard will cause symptoms. Clinical allergy is diagnosed by combining your history (timing and type of reaction) with testing, and sometimes a supervised oral food challenge.
How this differs from “food sensitivity” testing
This is an IgE test, which is the antibody class linked to immediate allergic reactions. Many “sensitivity” panels measure IgG, which does not diagnose IgE-mediated allergy and often reflects exposure rather than a harmful response.
What do my Sardine Pilchard Rf308 IgE results mean?
Low
Low or undetectable Sardine Pilchard Rf308 IgE
A low or undetectable result generally means sensitization to sardine/pilchard is unlikely. If you have had convincing immediate reactions, a low result does not completely rule out allergy, because timing, recent antihistamine use, lab cutoffs, and the specific proteins involved can affect detection. Your clinician may consider testing related fish allergens, skin testing, or a supervised food challenge depending on your history.
Optimal
In-range results (lab-specific)
For specific IgE tests, “in range” usually means within the lab’s expected reference interval, which is often the same as low/negative. If your result is near the cutoff, it may be reported as borderline or low-positive, and interpretation depends heavily on symptoms. The most helpful question is whether your number matches your real-world reactions and whether other fish/seafood IgE results show a consistent pattern.
High
High Sardine Pilchard Rf308 IgE
A higher result suggests stronger sensitization and can increase the likelihood that symptoms after exposure are allergy-related, especially when your reaction was rapid and reproducible. However, the number alone does not predict how severe a reaction will be, and it cannot tell you whether you will have anaphylaxis. If your result is high and you have had symptoms, discuss an avoidance plan and emergency preparedness with your clinician or allergist.
Factors that influence Sardine Pilchard Rf308 IgE
Your result can be influenced by cross-reactivity with other fish proteins, overall atopic tendency (such as eczema, asthma, or allergic rhinitis), and the time course of exposure and avoidance. Children can outgrow some food allergies, while fish allergy often persists, so trends over time should be interpreted carefully. Recent severe reactions do not always correlate with a higher number, and different labs or assay methods can yield slightly different values, so it helps to retest through the same lab when monitoring.
What’s included
- Sardine, Pilchard (Rf308) Ige
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Frequently Asked Questions
Do I need to fast for a Sardine/Pilchard IgE blood test?
Fasting is usually not required for specific IgE testing. If you are combining it with other labs (like lipids or glucose), follow the fasting instructions for the full set of tests you ordered.
What does a positive Sardine Pilchard Rf308 IgE mean?
A positive result means you are sensitized, meaning your immune system has made IgE that recognizes sardine/pilchard proteins. Whether that sensitization causes symptoms depends on your history, reaction timing, and sometimes additional testing guided by your clinician.
Can a negative IgE test still mean I react to sardines?
Yes. A negative result makes IgE-mediated allergy less likely, but it does not fully rule it out, especially if your reaction was immediate and consistent. Your clinician may consider testing other fish allergens, skin testing, or a supervised oral food challenge based on your risk.
Does the IgE level predict how severe my reaction will be?
Not reliably. Higher IgE can increase the likelihood of clinical allergy, but severity is influenced by many factors, including coexisting asthma, amount eaten, alcohol or exercise around the exposure, and individual sensitivity.
How is this different from skin prick testing for fish allergy?
This is a blood test that measures allergen-specific IgE in serum, while skin prick testing measures a local skin response to an allergen extract. They often provide complementary information, and your clinician may choose one or both depending on your history and medication use.
When should I retest sardine/pilchard IgE?
Retesting is typically considered when your clinician is monitoring changes over time, such as after a prolonged period of avoidance or when evaluating whether an allergy may be changing. Many people retest no more often than every 6–12 months unless there is a specific clinical reason.