Carrot F31 IgG test (food-specific IgG)
It measures IgG antibodies to carrot (F31) to help contextualize food exposure and symptoms, with easy ordering and Quest-based labs via Vitals Vault.
This panel bundles multiple biomarker tests in one order—your report explains how results fit together.
A Carrot F31 IgG test measures the amount of IgG antibody your immune system has made that can bind to carrot proteins (the “F31” allergen component used by many labs for carrot).
People often look at this test when they are trying to connect eating patterns with symptoms, or when they are reviewing a broader food antibody panel and want to understand what a single food result actually means.
Because IgG to foods can reflect exposure and immune recognition (not necessarily a true allergy), your result is most useful when you interpret it alongside your symptoms, your diet history, and—when appropriate—IgE allergy testing with your clinician.
Do I need a Carrot F31 IgG test?
You might consider a Carrot F31 IgG test if you notice repeatable symptoms that seem to track with meals and you want a structured way to review possible food triggers. Common reasons people seek this test include ongoing bloating, abdominal discomfort, changes in bowel habits, headaches, skin flares, or “brain fog” that feel diet-related but are not clearly explained by a single ingredient.
This test can also be helpful if you already have results from a multi-food IgG panel and carrot stands out, or if you eat carrots frequently (raw carrots, juices, soups, baby food, or mixed dishes) and want to understand whether your immune system shows a higher degree of recognition of that food.
You may not need this test if your concern is an immediate allergic reaction (hives, lip/tongue swelling, wheezing, throat tightness, or anaphylaxis). Those patterns are evaluated with allergy-focused testing such as carrot-specific IgE and clinical history, not IgG alone.
If you do test, treat the result as one data point that can support clinician-directed care and a thoughtful food trial, rather than a stand-alone diagnosis.
This is typically a CLIA-laboratory immunoassay for food-specific IgG; results are not diagnostic of food allergy and should be interpreted in clinical context.
Lab testing
Order Carrot F31 IgG testing through Vitals Vault and get results you can share 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 Carrot F31 IgG testing without needing a separate doctor’s visit just to access the lab. After you order, you complete your blood draw at a participating lab location, and your results are delivered to your Vitals Vault account.
Once your result is back, PocketMD can help you make sense of what “low,” “in range,” or “high” means for food-specific IgG, and how to think about next steps like a time-limited elimination and re-challenge plan, symptom tracking, or adding companion tests if your picture suggests allergy or another root cause.
If you are already working with a clinician, you can use your report to support a more focused conversation about whether carrot is likely relevant for you, and whether retesting after a diet change would add value.
- Order online and complete your draw at a local lab location
- Clear, shareable results you can bring to your clinician
- PocketMD guidance for interpreting results and planning follow-up
Key benefits of Carrot F31 IgG testing
- Helps you quantify immune recognition of carrot proteins instead of relying only on guesswork.
- Adds context when carrot shows up on a broader food IgG panel and you want to prioritize next steps.
- Supports a structured elimination-and-rechallenge plan when symptoms seem meal-related.
- May help explain why “healthy” foods like carrots or juices still feel like triggers for you.
- Gives you a baseline to compare against if you change your diet and later retest.
- Helps you decide when IgE allergy testing is a better fit for your symptoms (fast reactions vs delayed patterns).
- Pairs well with PocketMD interpretation so you can translate a lab number into a practical plan.
What is Carrot F31 IgG?
Carrot F31 IgG is a blood test that measures IgG antibodies directed at carrot proteins. IgG (immunoglobulin G) is the most common antibody class in your bloodstream, and it often reflects immune exposure and recognition over time.
Food-specific IgG is different from food-specific IgE. IgE is the antibody class most associated with classic, immediate-type allergy symptoms (such as hives or breathing symptoms soon after eating). IgG results, on the other hand, are commonly interpreted as a marker of immune recognition that may or may not correlate with symptoms.
That is why the most useful way to use a carrot IgG result is to combine it with your real-world pattern: how often you eat carrot, the form you eat it in (raw vs cooked vs juice), the timing of symptoms, and whether you have other allergic conditions (seasonal allergies, eczema, asthma) that raise the likelihood of an IgE-mediated process.
What the “F31” part means
“F31” is a lab designation used to identify carrot as a specific food allergen component in testing catalogs. It helps standardize ordering and reporting so that “carrot” results are comparable within a lab’s method.
What this test can and cannot tell you
A higher IgG result can suggest more immune recognition of carrot, which sometimes tracks with frequent intake and sometimes tracks with symptoms. It does not, by itself, prove that carrot is causing your symptoms, and it does not rule out other explanations such as FODMAP sensitivity, histamine intolerance patterns, reflux, migraine triggers, or non-food causes.
What do my Carrot F31 IgG results mean?
Low Carrot F31 IgG
A low result generally means your blood shows little measurable IgG binding to carrot proteins. This can happen if you rarely eat carrots, if your immune system has not developed strong recognition of carrot, or if your level is below the assay’s detection threshold. If you still have clear, immediate reactions to carrot, a low IgG does not rule out an IgE-type allergy, so symptom pattern matters.
In-range (or mild) Carrot F31 IgG
An in-range or mild result is common and often reflects normal immune exposure, especially if carrots are a regular part of your diet. Many people with mild IgG findings have no symptoms from that food. If you are symptomatic, this range is usually interpreted as “not a strong signal,” so it may be more productive to look at other foods, overall dietary patterns, or non-food contributors.
High Carrot F31 IgG
A high result means your immune system shows stronger measurable IgG recognition of carrot proteins. This can occur with frequent intake (including carrot juice or mixed foods) and does not automatically mean carrot is harmful for you. If your symptoms reliably worsen with carrot and improve when you avoid it, a high result can support a time-limited elimination followed by a careful re-challenge to test causality with your clinician’s guidance.
Factors that influence Carrot F31 IgG
How often you eat carrots is one of the biggest drivers of food-specific IgG levels, so higher exposure can raise results even in people who feel fine. Cooking and processing can change proteins and may affect how your body responds, so raw carrots versus cooked carrots may not feel the same. Immune conditions, recent infections, and overall inflammation can shift antibody patterns, and different labs may use different cutoffs or reporting categories. Medications that affect the immune system can also influence antibody measurements, so include your medication list when you review results.
What’s included
- Carrot (F31) Igg
Frequently Asked Questions
Is Carrot F31 IgG the same as a carrot allergy test?
Not exactly. This test measures IgG antibodies to carrot, which are often interpreted as immune recognition or exposure. A classic food allergy evaluation focuses on symptoms plus carrot-specific IgE testing (and sometimes skin testing) because IgE is more closely tied to immediate allergic reactions.
Do I need to fast before a Carrot IgG blood test?
Fasting is usually not required for a single food-specific IgG test. If you are combining it with other labs (like lipids or glucose testing), follow the fasting instructions for the full set of tests you ordered.
If my Carrot F31 IgG is high, should I stop eating carrots?
A high IgG result alone is not proof that carrots are causing harm. The most practical approach is to match the lab result to your symptom pattern. If carrot is a suspected trigger, consider a time-limited elimination (often a few weeks) followed by a planned re-challenge while tracking symptoms, ideally with clinician guidance.
How soon should I retest Carrot F31 IgG after eliminating carrots?
Antibody patterns do not change overnight. If you are retesting to see whether levels trend down after a sustained diet change, many people wait at least 8–12 weeks. Retesting is most useful when it is paired with symptom tracking, because symptom change is usually the primary outcome.
Can I have symptoms from carrots even if my IgG is low?
Yes. Symptoms can come from mechanisms that IgG testing does not capture, including IgE-mediated allergy, oral allergy syndrome patterns related to pollen cross-reactivity, reflux, or sensitivity to other ingredients in a meal. If you have fast-onset symptoms (minutes to a couple of hours), discuss IgE testing with your clinician.
What is the difference between IgG and IgE food tests?
IgE is the antibody class most associated with immediate allergic reactions and is used in standard allergy workups. IgG is more often interpreted as immune recognition/exposure and may or may not correlate with symptoms. Your timing of symptoms and clinical history usually determine which test is more appropriate.
Could carrot cross-react with other foods or pollens?
Some people who react to raw fruits and vegetables have patterns related to pollen sensitization (often discussed as oral allergy syndrome). In those cases, symptoms may be stronger with raw carrot and milder with cooked carrot. If this sounds like you, IgE testing and an allergy-focused review can be more informative than IgG alone.