Can the 184 IgG panel diagnose food allergies?

No. Major allergy societies do not endorse IgG testing for diagnosing food allergy. IgG antibodies can be present in healthy individuals simply from dietary exposure, so elevated IgG does not confirm true allergy or intolerance and must be interpreted in clinical context.

Why do practitioners order this panel for gastrointestinal symptoms?

Practitioners in integrative and functional medicine use the IgG profile to identify foods that may be triggering chronic gut symptoms through delayed immune pathways or increased intestinal permeability. The results guide structured elimination diets, which are then assessed for symptom improvement.

Should patients eliminate all foods that show elevated IgG?

Not automatically. Elevated IgG may reflect normal dietary exposure. Practitioners typically recommend eliminating foods with moderate or strong reactivity for a trial period of four to twelve weeks, reassessing symptoms, and then reintroducing foods systematically to identify true triggers.

Is fasting required before the test?

No, fasting is not required. Patients should be consuming their usual diet in the weeks before testing so that IgG levels accurately reflect current food exposure; recent elimination of suspect foods may reduce antibody titres and yield false-negative results.

Can this panel diagnose coeliac disease or lactose intolerance?

No. Coeliac disease is diagnosed with tissue transglutaminase IgA and total IgA or deamidated gliadin peptide antibodies, plus duodenal biopsy if indicated. Lactose intolerance is an enzyme deficiency and requires hydrogen breath testing or genetic testing for lactase persistence. The IgG panel does not replace these specific tests.

What does it mean if the panel shows reactivity to many foods?

Polysensitivity often reflects increased intestinal permeability or dysbiosis, allowing multiple food antigens to provoke IgG responses. In this scenario, addressing gut barrier integrity — through probiotics, anti-inflammatory diet, and treatment of underlying conditions — may reduce antibody levels over time.

Are results from Alletess comparable to other IgG food panels?

No. Different laboratories use distinct antigen preparations, ELISA platforms, and reference thresholds, so IgG results are assay-specific and not interchangeable. Serial monitoring should use the same laboratory for consistency.

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184 IgG Gastrointestinal Panel

The 184 IgG Gastrointestinal Panel quantifies serum IgG antibodies to 184 dietary antigens. Practitioners in functional and integrative medicine use it to explore delayed, non-IgE food sensitivities and to guide empirical elimination diets in patients with chronic gastrointestinal symptoms, migraines, or fatigue.

Biomarkers

Blood (serum)

Sample

7–10 business days

Turnaround

Fasting

What is the 184 IgG GI Panel test?

The 184 IgG Gastrointestinal Panel measures serum IgG antibodies to 184 dietary antigens, spanning staple and specialised foods across multiple categories. Practitioners order this panel to investigate chronic symptoms that have not responded to conventional gastroenterology work-up and that may be driven by food-immune interactions — bloating, altered bowel habit, abdominal discomfort, fatigue, joint pain, skin eruptions, and recurrent headache among them. The panel does not diagnose IgE-mediated food allergy, coeliac disease, or lactose intolerance, each of which has specific validated tests; instead it explores the possibility that immune reactivity to foods is contributing to a patient's symptom burden. In functional and integrative practice the IgG profile serves as a roadmap for structured elimination and reintroduction: foods with strong or moderate reactivity are removed for a defined period — typically four to twelve weeks — symptoms are reassessed, and antibody titres may be retested after the gut has had time to heal. The panel is ordered when the clinical picture suggests food-immune involvement and when a broad, empirical trial is preferred to sequential single-food challenges. It is not a replacement for thorough history, symptom diaries, or exclusion of organic disease, but rather a complementary tool in the hands of practitioners comfortable with its contested evidence base and willing to frame results as hypothesis-generating rather than definitive.

What does the 184 IgG GI Panel test measure?

IgG Panel(IgG Antibody Reactivity Profile (184 foods))

Range: Assay-specific thresholds classify each antigen as negative, borderline, mild, moderate, or strong reactivity.Optimal: Negative or low reactivity across the panel is typical in individuals without significant gastrointestinal permeability or immune dysregulation. Elevated IgG to multiple foods may reflect increased intestinal permeability, dysbiosis, or chronic low-grade inflammation.Relative units / Qualitative classification

Food-specific IgG antibodies are produced when dietary antigens cross the intestinal epithelium and trigger an adaptive immune response. IgG is the most abundant immunoglobulin in serum and has a half-life of approximately three weeks, making it a marker of repeated or sustained exposure rather than acute reaction. The presence of IgG to a food may reflect normal immune tolerance, increased intestinal permeability, or an immunologically mediated sensitivity; distinguishing these scenarios requires clinical correlation. Unlike IgE-mediated allergy, which provokes immediate mast-cell degranulation, IgG reactions are postulated to involve immune-complex formation and delayed inflammatory pathways, though this mechanism remains contested in the allergy literature.

The 184 IgG panel quantifies antibody reactivity to a broad array of common and specialised foods, dairy proteins, grains, legumes, fruits, vegetables, meats, seafood, nuts, seeds, spices, and additives. Practitioners in functional and integrative medicine use the profile to guide empirical elimination diets in patients with chronic gastrointestinal symptoms, migraines, fatigue, or other conditions postulated to have a food-immune trigger. The clinical validity of IgG testing for food sensitivity is debated — major allergy societies do not endorse it for diagnosing food allergy, and IgG may simply reflect dietary exposure in healthy individuals. Its utility lies in identifying candidates for trial elimination and monitoring antibody trends during dietary intervention, rather than as a stand-alone diagnostic.

Why is the 184 IgG GI Panel test ordered?

Evaluation of chronic, unexplained gastrointestinal symptoms — bloating, irregular bowel habit, discomfort — after exclusion of inflammatory bowel disease, coeliac disease, and other structural pathology
Investigation of suspected non-IgE food sensitivities in patients with recurrent migraines, chronic fatigue, or fibromyalgia-like presentations where dietary triggers are postulated
Assessment of patients with suspected increased intestinal permeability or dysbiosis, particularly when multiple food intolerances are reported
Guidance for empirical elimination diets in integrative or functional-medicine contexts, where a broad reactivity profile informs the foods to remove
Monitoring of IgG antibody trends in patients on gut-healing protocols or after periods of dietary restriction, to assess whether reactivity has diminished
Exploration of immune-mediated contributors to chronic inflammatory conditions — eczema, psoriasis, inflammatory arthritis — where food antigens are suspected to perpetuate inflammation
Investigation of paediatric behavioural or developmental concerns in which parents or practitioners suspect dietary influences, though evidence remains exploratory

Sample collection and turnaround

Sample type

Blood (serum)

Fasting required

Collection method

Venipuncture at patient service centre

Turnaround

7–10 business days

Collection notes

Standard phlebotomy; minimum 2–3 mL serum required. The sample is sent to Alletess Medical Laboratory for processing. Patients should be consuming their usual diet in the weeks before testing to ensure IgG levels reflect current exposure; recent elimination of suspect foods may reduce antibody titres and lead to false-negative results. Note that Alletess uses a proprietary ELISA platform, so results are not directly comparable to other IgG food panels.

Specimen requirements

Minimum 2 mL serum (red-top or serum separator tube). Separate serum from cells within two hours; freeze if shipment to Alletess is delayed beyond 24 hours. Avoid haemolysis and lipemia, which can interfere with ELISA readings.

What can affect 184 IgG GI Panel results?

elevatesRecent or current consumption of tested foods

IgG antibodies rise with repeated exposure, so a food eaten regularly will typically show higher titres; this may reflect normal tolerance rather than pathology, complicating interpretation.

elevatesIncreased intestinal permeability

When the gut barrier is compromised — by dysbiosis, infection, NSAID use, or inflammation — larger food antigens cross into the circulation and provoke IgG production, so elevated reactivity can be secondary to permeability rather than a primary food issue.

reducesImmunosuppressive therapy or immunodeficiency

Patients on high-dose corticosteroids, biologics, or with hypogammaglobulinaemia may produce blunted IgG responses, potentially masking true reactivity.

reducesTime since last exposure

IgG titres decline over weeks to months after antigen withdrawal, so a food eliminated before testing may show falsely low or negative reactivity.

variableLaboratory and assay variation

Different platforms (ELISA, microarray) and laboratories use distinct antigen preparations, thresholds, and reference populations, so results are not directly comparable across vendors.

variableCross-reactivity between structurally similar proteins

Antibodies raised to one food may bind related proteins in another, leading to apparent polysensitivity; for example, reactivity to multiple grains or tree nuts may reflect shared epitopes rather than independent sensitivities.

What do 184 IgG GI Panel results mean?

Elevated

Multiple elevated IgG reactivities: Consider increased intestinal permeability, dysbiosis, or chronic low-grade gut inflammation as upstream drivers. Use the pattern to design a structured elimination diet — typically removing all moderate and strong reactivities for 4–12 weeks — and reassess symptoms. Isolated strong reactivity to a single food warrants trial elimination of that food. Elevated IgG is not diagnostic of food allergy or intolerance and should be interpreted as a hypothesis for empirical intervention.

Normal

A mixed profile with scattered low-level reactivities is common in healthy individuals and reflects dietary exposure; clinical correlation is essential to distinguish benign exposure from symptomatic sensitivity. Do not recommend elimination based solely on borderline or low-level results without a clear symptom-food temporal relationship.

Reduced

Negative or low reactivity across the panel: Suggests intact immune tolerance and barrier function, or that IgG is not the relevant immune pathway for the patient's symptoms. Consider alternative mechanisms — enzyme deficiencies (lactase, sucrase), fermentable carbohydrate intolerance (FODMAP), histamine excess, or non-immune food reactions. Low reactivity can also occur if relevant foods were already eliminated before testing or if the patient is immunocompromised.

Note: IgG food testing is not endorsed by major allergy societies for diagnosing food allergy or intolerance; IgG may represent normal immune exposure. Results are assay- and laboratory-specific and not interchangeable. Use as part of a broader clinical assessment — symptom diary, dietary history, exclusion of organic disease — and frame as a guide to empirical elimination rather than a definitive test. Retest after gut healing to document antibody decline. Do not use IgG testing to diagnose coeliac disease, IgE-mediated allergy, or lactose intolerance.

Frequently asked questions

IgE food testing detects immediate, potentially life-threatening allergic reactions mediated by mast-cell degranulation. IgG testing measures delayed antibody responses that may reflect exposure, tolerance, or sensitivity; it is used in functional medicine to explore non-anaphylactic food reactions but is not a validated allergy diagnostic.

How to access the 184 IgG GI Panel test

The 184 IgG GI Panel reference page is free and open to all practitioners. Create a free practitioner account to see pricing, save tests to your list, and generate requisition forms. Verification takes 1–2 business days.

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About this page

Published: October 7, 2026

Last reviewed: October 7, 2026

References:

Stapel SO, et al. Testing for IgG4 against foods is not recommended as a diagnostic tool: EAACI Task Force Report. Allergy. (2008)
American Academy of Allergy, Asthma & Immunology (AAAAI) position statement on the use of IgG and IgG subclass measurements in the diagnosis of food allergy. (2019)
Gunasekeera V, et al. Treatment of IgG-mediated food intolerance: a systematic review. Nutrients. (2016)
Lied GA, et al. Antibodies to dietary antigens in irritable bowel syndrome. Neurogastroenterol Motil. (2012)
Fasano A. Intestinal permeability and its regulation by zonulin: diagnostic and therapeutic implications. Clin Gastroenterol Hepatol. (2012)

This content is for licensed healthcare practitioners only and does not constitute medical advice. Clinical decisions should be based on the full clinical picture and not on any single test result.