184 IgG Food Sensitivity & 50 Expanded IgE Combo Panel
The 184 IgG Food Sensitivity & 50 Expanded IgE Combo Panel measures IgG antibodies to 184 foods, IgE antibodies to 50 allergens, and total IgE. IgE results identify sensitisation and risk of immediate allergy; IgG reactivity is used in integrative practice to guide empiric elimination diets, though major allergy societies do not endorse IgG as diagnostic of intolerance.
3
Biomarkers
Blood (serum)
Sample
10–14 business days
Turnaround
No
Fasting
What is the 184 IgG + 50 IgE Combo test?
The 184 IgG Food Sensitivity & 50 Expanded IgE Combo Panel combines measurement of IgG antibodies to 184 foods with IgE antibodies to 50 common allergens and total IgE, aiming to differentiate immediate IgE-mediated allergy from putative delayed IgG-mediated sensitivity. Practitioners order it when patients present with complex, non-specific symptoms — chronic gastrointestinal discomfort, fatigue, headache, joint pain, skin eruptions — that have not responded to standard investigation and where dietary triggers are suspected but the clinical picture does not fit classic IgE-mediated allergy. The IgE component of the panel is well established: it detects sensitisation to foods known to provoke immediate reactions and is used to confirm or exclude IgE-mediated allergy, inform avoidance strategies, and assess risk before supervised challenges. The IgG component is more controversial; food-specific IgG is widely detected in healthy populations and many allergy societies do not endorse IgG testing as a diagnostic tool. Nevertheless, some integrative and functional-medicine practitioners employ IgG panels to guide empiric elimination diets, reporting anecdotal clinical improvement. This panel is thus a tool for exploratory dietary intervention rather than a definitive diagnostic test, and results should be contextualised within the patient's history, symptom diary, and willingness to undertake systematic elimination and reintroduction.
What does the 184 IgG + 50 IgE Combo test measure?
IgG antibodies to dietary proteins are produced after repeated exposure and represent immune recognition rather than necessarily indicating adverse reaction. They are the predominant serum immunoglobulin class and cross the intestinal mucosa as part of routine immune surveillance. Whether elevated food-specific IgG titres reflect pathological sensitivity, tolerance with exposure, or simple dietary history remains contested; different investigators report IgG as a marker of tolerance and others as a driver of delayed hypersensitivity.
Proponents of IgG food-sensitivity testing suggest that elevated titres correlate with delayed, non-IgE-mediated symptoms — fatigue, bloating, headache, joint pain — that may improve with elimination of high-reactivity foods. Critics emphasise that IgG to food is commonly detected in healthy individuals, that commercial assays lack standardisation, and that controlled trials have produced inconsistent results. When used, IgG reactivity is interpreted as a guide to empiric elimination trials rather than as diagnostic proof of intolerance.
IgE antibodies mediate type I immediate hypersensitivity. Food-specific IgE binds to mast cells and basophils; upon re-exposure to the allergen, cross-linking of IgE triggers degranulation and release of histamine and other mediators within minutes to hours, producing urticaria, angioedema, bronchospasm, or anaphylaxis.
Elevated food-specific IgE indicates sensitisation and risk of immediate allergic reaction. Sensitisation does not equal clinical allergy — many individuals with detectable IgE tolerate the food without symptoms — so results must be correlated with history and, where appropriate, supervised oral challenge. IgE testing is standard in the investigation of suspected IgE-mediated food allergy and guides avoidance and emergency preparedness.
Total IgE reflects the sum of all circulating IgE, both allergen-specific and polyclonal. It is elevated in atopic individuals, parasitic infection, and certain immunodeficiencies. Total IgE does not identify the offending allergen but provides context for the likelihood and severity of atopy.
Marked elevation of total IgE supports an atopic diathesis and may guide decisions about biologic therapy (omalizumab) in severe asthma or chronic urticaria. In the context of food allergy, total IgE helps interpret the clinical significance of specific IgE results but does not replace them.
Why is the 184 IgG + 50 IgE Combo test ordered?
- Investigation of chronic, non-specific gastrointestinal symptoms — bloating, altered bowel habit, discomfort — in patients without coeliac disease, inflammatory bowel disease, or other structural pathology
- Assessment of patients with recurrent headaches, fatigue, or musculoskeletal pain where dietary triggers are suspected but standard allergy testing and elimination trials have been inconclusive
- Differentiation of immediate IgE-mediated food allergy from possible delayed sensitivity in patients with mixed acute and chronic symptoms
- Evaluation of atopic individuals with multiple suspected food triggers, where comprehensive IgE and exploratory IgG profiling may streamline empiric diet modification
- Pre-emptive screening in patients planning integrative or functional-medicine dietary intervention, accepting that IgG reactivity is a guide rather than a diagnosis
- Paediatric cases of unexplained chronic symptoms where conventional allergy work-up has been negative and parents seek a systematic approach to dietary trial, provided the limits of IgG interpretation are explained
Sample collection and turnaround
Sample type
Blood (serum)
Fasting required
No
Collection method
Venipuncture at patient service centre
Turnaround
10–14 business days
Collection notes
Phlebotomy required; serum is sent to Alletess Medical Laboratory for analysis. No special dietary preparation is required before the draw, though practitioners may ask patients to maintain their usual diet for a period before testing so that IgG reflects current exposure. Avoid collection during or immediately after acute allergic reaction if possible, to ensure stable antibody titres.
Specimen requirements
Minimum 7–10 mL serum (exact volume confirmed with the laboratory). Separate from clot promptly and refrigerate or freeze if shipment is delayed. Alletess provides collection kits and detailed instructions; follow laboratory protocol for specimen handling and transport.
What can affect 184 IgG + 50 IgE Combo results?
IgG titres reflect exposure history; foods eaten regularly may show higher IgG simply because the immune system has been presented with the antigen, complicating the distinction between tolerance and sensitivity.
Conditions or therapies that suppress antibody production (immunodeficiency, high-dose corticosteroids, chemotherapy) can lower both IgG and IgE, leading to false-negative results.
Acute allergic reactions transiently consume IgE; recent antihistamines do not directly affect antibody levels but can mask clinical correlation. Timing of the draw relative to reaction and medication is noted.
Pollen-food syndromes and cross-reactive carbohydrate determinants can produce positive IgE without clinical food allergy; clinical history is essential to distinguish true from cross-reactive positivity.
Commercial IgG food-sensitivity assays differ in antigen preparation, cut-offs, and reproducibility, so results from different laboratories are not directly comparable and serial monitoring should use the same platform.
Parasitic infection raises total IgE markedly, which can dilute the relative contribution of food-specific IgE and complicate interpretation; geographical and travel history should be considered.
What do 184 IgG + 50 IgE Combo results mean?
Elevated
IgE: Sensitisation to one or more foods; clinical allergy is confirmed by history of reaction and, where safe and indicated, supervised oral challenge. High-level IgE (>15–20 kU/L for major allergens) correlates with higher likelihood of clinical reactivity. IgG: Elevated reactivity to multiple foods; in the functional-medicine paradigm this may guide a structured elimination diet targeting moderate-to-high responders, followed by systematic reintroduction and symptom tracking. Mainstream allergy guidelines do not recognise elevated IgG as diagnostic of food intolerance.
Normal
Negative or low-level IgE and IgG to the tested foods. IgE-mediated allergy to those antigens is unlikely; if symptoms persist, consider non-IgE-mediated mechanisms, other dietary components (FODMAPs, histamine, additives), or non-dietary causes. A negative comprehensive panel substantially narrows the list of dietary suspects.
Reduced
Low or absent IgE to tested foods suggests that IgE-mediated allergy to those antigens is unlikely, though it does not exclude non-IgE-mediated disorders such as eosinophilic oesophagitis or food-protein-induced enterocolitis. Low IgG across the panel is uncommon and may reflect limited dietary variety, immunodeficiency, or assay factors; clinical significance is uncertain.
Note: IgE detects sensitisation, not clinical allergy; correlation with history is mandatory. IgG reactivity is not accepted as a stand-alone diagnostic by major allergy societies; its use is exploratory and must be framed as such to patients. Elimination diets guided by IgG should be time-limited, nutritionally balanced, and followed by reintroduction to confirm symptom–food relationships. Because the panel tests a large number of antigens, incidental low-level positives are common and do not all require intervention.
Frequently asked questions
IgE antibodies mediate immediate allergic reactions — urticaria, angioedema, anaphylaxis — within minutes to hours. IgG antibodies are thought by some practitioners to correlate with delayed, non-specific symptoms, though this interpretation is contested and IgG is commonly found in healthy individuals without food intolerance.
How to access the 184 IgG + 50 IgE Combo test
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Published: October 7, 2026
Last reviewed: October 7, 2026
- Stapel SO, et al. Testing for IgG4 against foods is not recommended as a diagnostic tool: EAACI Task Force Report. Allergy. (2008)
- Boyce JA, et al. Guidelines for the diagnosis and management of food allergy in the United States: report of the NIAID-sponsored expert panel. J Allergy Clin Immunol. (2010)
- Carr S, et al. CSACI position statement on the testing of food-specific IgG. Allergy Asthma Clin Immunol. (2012)
- Carroccio A, et al. Non-celiac wheat sensitivity diagnosed by double-blind placebo-controlled challenge: exploring a new clinical entity. Am J Gastroenterol. (2012)
- Bernstein JA, et al. Allergy diagnostic testing: an updated practice parameter. Ann Allergy Asthma Immunol. (2008)
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.