Can a positive IgE result confirm a food allergy?

Not on its own. Positive IgE indicates sensitisation and raises the probability of allergy, but many people with detectable IgE tolerate the food without symptoms. Clinical history is essential, and in ambiguous cases an allergist may perform an oral food challenge to confirm or exclude true allergy.

Should all foods that test positive be eliminated from the diet?

Not necessarily. IgG positives are common and do not mandate avoidance; functional practitioners typically trial elimination of high-reactive foods and reintroduce them systematically, guided by symptom response. IgE positives warrant caution if there is a history of reaction, but asymptomatic sensitisation does not require strict avoidance—discuss with an allergist.

Does this panel diagnose coeliac disease or lactose intolerance?

No. Coeliac disease requires tissue transglutaminase or endomysial antibodies and duodenal biopsy; lactose intolerance is diagnosed by breath testing or trial elimination. IgG/IgE panels measure immune responses to proteins, not enzymatic or autoimmune pathology, and should not replace disease-specific tests.

How soon after starting an elimination diet should the test be done?

Ideally before elimination. IgG titres fall during prolonged avoidance, so testing after weeks off a food may yield false negatives. If elimination has already begun, discuss reintroduction for several weeks before testing, balancing symptom control against the validity of the result.

Are results from different laboratories interchangeable?

No. IgG food-sensitivity assays are not standardised; cutoffs, methods, and panels vary between labs. Serial or comparative testing should use the same laboratory, and switching labs may produce discordant results even without true biological change.

What are the limitations and controversies around this panel?

IgG food testing lacks endorsement from mainstream allergy organisations and is considered investigational; positive results do not establish causation of symptoms. IgE testing is validated for sensitisation but does not distinguish clinical allergy from asymptomatic reactivity without history. Both require clinical correlation, and results should inform—not dictate—management. Patients should be counselled on the contested evidence base and the empirical, trial-based nature of any dietary changes.

BML-FSA-012food sensitivity allergyUSA

184 IgG Food Sensitivity & 25 Comprehensive IgE Combo Panel

Q: What is the difference between IgG and IgE food antibodies?

IgE mediates immediate allergic reactions—urticaria, angioedema, anaphylaxis—and its presence indicates sensitisation that may predict clinical allergy. IgG reflects immunological exposure to foods and is common in healthy individuals; mainstream allergy organisations regard it as a marker of tolerance or exposure rather than allergy, though some functional practitioners use it to guide elimination diets.

Q: Is IgG food testing accepted by conventional allergy specialists?

No. Major allergy societies including EAACI, AAAAI, and CSACI state that food-specific IgG testing is not recommended for diagnosing food allergy or intolerance. Its use is largely confined to integrative and functional medicine, where it informs empirical dietary trials rather than serving as a standalone diagnostic.

The 184 IgG Food Sensitivity & 25 Comprehensive IgE Combo Panel measures serum IgG to 184 foods and IgE to 25 allergens. IgE reflects true allergic sensitisation but must be correlated with clinical history; IgG testing is not endorsed by mainstream allergy societies for diagnosis yet is employed in functional medicine to guide empirical elimination diets, interpreted as exposure markers rather…

Biomarkers

Blood (serum)

Sample

7–10 business days

Turnaround

Fasting

What is the 184 IgG + 25 IgE Combo test?

The 184 IgG Food Sensitivity & 25 Comprehensive IgE Combo Panel measures serum antibodies to a broad range of foods, pairing an extensive IgG screen with a focused IgE panel. It is ordered by practitioners seeking to explore possible food-related triggers in patients with chronic, non-specific symptoms — fatigue, headaches, gastrointestinal discomfort, joint pain, or skin complaints — that have not yielded to initial investigation and where dietary factors are suspected but unclear. The panel's design reflects two distinct immunological mechanisms: the IgE component addresses true allergic sensitisation and immediate hypersensitivity, while the IgG component is employed in functional and integrative settings to identify foods that might provoke delayed or non-IgE-mediated reactions. Mainstream allergy guidelines do not endorse IgG testing for food allergy or intolerance diagnosis, and practitioners who order this panel typically frame it as a tool to guide empirical elimination trials rather than as a definitive diagnostic test. The results inform personalised dietary interventions, which are then assessed by symptom response rather than antibody titre alone.

What does the 184 IgG + 25 IgE Combo test measure?

IgG(Food-Specific Immunoglobulin G Antibodies)

Range: Laboratory-specific; results typically reported as negative, borderline (equivocal), or positive relative to a validated cutoff.Optimal: No validated 'optimal' range exists; the concept of an optimal IgG titre to a food is not supported by conventional immunology. Results are interpreted in the context of symptoms and dietary history rather than as standalone diagnostic markers.Arbitrary units (U/mL or standardised scale) / Qualitative (negative/borderline/positive)

IgG is the most abundant immunoglobulin class in serum, mediating long-term immune memory and conferring passive immunity. Food-specific IgG antibodies develop after repeated exposure to dietary antigens that cross the gut mucosa. Their presence reflects immunological exposure rather than necessarily indicating a pathological immune reaction. IgG responses to food are common in healthy individuals and may represent oral tolerance mechanisms as much as adverse reactivity.

The clinical significance of food-specific IgG remains contested. Mainstream allergy organisations, including the European Academy of Allergy and Clinical Immunology and the American Academy of Allergy, Asthma & Immunology, regard IgG testing as a marker of exposure rather than allergy or intolerance. Some integrative and functional medicine practitioners employ IgG panels to guide empirical elimination diets when patients report chronic symptoms possibly linked to foods, though the evidence base for this approach is limited and the results should not be equated with IgE-mediated allergy or coeliac disease.

IgE(Food-Specific Immunoglobulin E Antibodies)

Range: Class 0 (<0.35 kU/L) is negative; class 1 (0.35–0.69 kU/L) low positive; classes 2–6 indicate progressively higher titres. Clinical reactivity correlates imperfectly with titre and depends on the allergen.Optimal: Optimal is the absence of clinically significant IgE sensitisation (class 0), though low-level IgE without symptoms does not mandate avoidance. Decision thresholds for likely reactivity vary by allergen and are continually refined.kU/L (kilounits per litre) / Qualitative class (0–6)

IgE antibodies are produced by plasma cells in response to allergens and bind high-affinity receptors on mast cells and basophils. Cross-linking of surface-bound IgE by multivalent allergen triggers degranulation and immediate hypersensitivity, the hallmark of IgE-mediated (Type I) allergy. Food-specific IgE develops when mucosal tolerance fails and the immune system mounts a Th2-skewed response to dietary proteins.

Elevated food-specific IgE indicates sensitisation and raises the probability of an IgE-mediated allergic reaction upon ingestion, but sensitisation is not synonymous with clinical allergy — many sensitised individuals tolerate the food. IgE results must be interpreted alongside clinical history; a positive result with no history of reaction may represent asymptomatic sensitisation or cross-reactivity with environmental allergens. Conversely, a negative result does not exclude non-IgE-mediated food allergy or intolerance.

Why is the 184 IgG + 25 IgE Combo test ordered?

Investigation of chronic, non-specific symptoms — fatigue, bloating, headache, joint pain, or skin inflammation — where dietary triggers are suspected but history and symptom diary have not identified clear culprits
Patients reporting suspected delayed food reactions that do not fit the immediate-onset pattern of IgE-mediated allergy and for whom standard allergy testing has been unrevealing
Guidance for structured elimination-and-reintroduction diets in integrative or functional medicine protocols, where empirical dietary trials are a planned part of management
Evaluation of possible food triggers in irritable bowel syndrome or other functional gastrointestinal disorders, when standard gastroenterological investigation has excluded organic disease
Assessment of suspected food sensitisation in atopic patients — eczema, asthma, or allergic rhinitis — where environmental allergen control has been optimised yet symptoms persist
Preconceptional or paediatric nutrition planning in practices that employ food-sensitivity testing to tailor anti-inflammatory diets, though evidence for this indication is limited
Baseline screening in patients interested in personalised nutrition who request antibody-guided dietary modification, with informed consent regarding the contested evidence base

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 venepuncture; serum separated and shipped to Alletess Medical Laboratory. No fasting required, though some practitioners prefer patients to be on their usual diet for several weeks before testing to capture typical exposure patterns. Avoid testing during acute illness or while on high-dose immunosuppression if possible, as these may alter antibody responses.

Specimen requirements

Minimum 5 mL serum (red-top or serum separator tube). Separate serum promptly, refrigerate or freeze if shipment is delayed. Avoid haemolysed or lipemic specimens where possible. Follow Alletess-specific instructions for collection kit and shipment if provided.

What can affect 184 IgG + 25 IgE Combo results?

variableRecent dietary exposure and avoidance

IgG titres rise with regular consumption and fall during prolonged avoidance, so recent elimination of a food may yield a false-negative IgG result. IgE titres are more stable but can also wane after extended avoidance or with the development of tolerance.

variableTotal serum IgG or IgE concentration

Hypogammaglobulinaemia lowers all IgG responses, including food-specific; conversely, polyclonal elevation (infection, autoimmunity) can non-specifically raise IgG. Hyper-IgE syndromes or atopy elevate total IgE, potentially increasing food-specific titres without clinical relevance.

elevatesGastrointestinal permeability

Increased intestinal permeability — whether from infection, inflammation, coeliac disease, or other enteropathy — allows greater passage of food antigens and may drive higher IgG responses independent of true intolerance.

reducesConcurrent immunosuppression or immunotherapy

Corticosteroids, biologics, or immunotherapy can blunt antibody production and alter the titre and pattern of food-specific antibodies, potentially masking sensitisation.

variableCross-reactivity between allergens

Homologous proteins in botanically or taxonomically related foods (e.g., tree nuts, shellfish) and pollen-food cross-reactivity (oral allergy syndrome) can produce positive IgE results without primary sensitisation to that specific food, complicating interpretation.

variableLaboratory method and cutoff calibration

IgG food-sensitivity assays are not standardised across laboratories; results and cutoffs are method-specific and not interchangeable. Repeat testing should use the same laboratory for valid comparison.

What do 184 IgG + 25 IgE Combo results mean?

Elevated

Elevated food-specific IgG reflects immunological exposure and is common in healthy individuals; it does not diagnose allergy or intolerance by mainstream criteria. In functional medicine practice elevated IgG is used to prioritise foods for temporary elimination, with reintroduction guided by symptom response. Elevated food-specific IgE indicates sensitisation and raises the probability of IgE-mediated allergy, but clinical correlation is essential — asymptomatic sensitisation is common, and titre alone does not mandate strict avoidance. High-titre IgE (class 3 or above) to a major allergen warrants cautious reintroduction under supervision if the patient has a history of reaction.

Normal

The majority of tested foods will fall into the 'negative' or low-reactivity range. This is expected — a normal result for most foods does not invalidate the panel but rather helps narrow the focus to the subset of foods showing reactivity. For IgG, 'normal' is the usual state of oral tolerance; for IgE, it reflects the absence of sensitisation to those specific allergens.

Reduced

Low or absent IgG to tested foods may indicate limited dietary exposure, effective oral tolerance, or recent prolonged avoidance. Low or negative IgE is reassuring but does not exclude non-IgE-mediated food allergy, delayed-pattern adverse reactions, or intolerances mediated by non-immune mechanisms (enzyme deficiencies, pharmacological reactions). Normal antibody results should not deter investigation of suspected coeliac disease, lactose intolerance, or histamine intolerance, which require different tests.

Note: IgG food-sensitivity testing is not endorsed by major allergy societies for diagnosing food allergy or intolerance; its use is largely confined to integrative and functional medicine and should be presented to patients as a tool to guide empirical dietary trials rather than as a definitive test. IgE results must be interpreted with clinical history — sensitisation without symptoms does not require avoidance, and a negative result does not rule out all adverse food reactions. Cross-reactivity, particularly between pollens and plant foods, can yield positive IgE without primary food allergy. Results are laboratory-specific and not interchangeable between assays. Any significant positive IgE or concerning clinical history should prompt referral to an allergist for confirmatory testing, oral food challenge if indicated, and management planning including emergency preparedness.

Frequently asked questions

IgE mediates immediate allergic reactions—urticaria, angioedema, anaphylaxis—and its presence indicates sensitisation that may predict clinical allergy. IgG reflects immunological exposure to foods and is common in healthy individuals; mainstream allergy organisations regard it as a marker of tolerance or exposure rather than allergy, though some functional practitioners use it to guide elimination diets.

How to access the 184 IgG + 25 IgE Combo test

The 184 IgG + 25 IgE Combo 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. EAACI Task Force report: testing for IgG4 against foods is not recommended as a diagnostic tool. 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)
Sampson HA, et al. Food allergy: a practice parameter update—2014. J Allergy Clin Immunol. (2014)
Carr S, et al. CSACI position statement on the testing of food-specific IgG. Allergy Asthma Clin Immunol. (2012)
Muraro A, et al. EAACI food allergy and anaphylaxis guidelines: diagnosis and management of food allergy. Allergy. (2014)

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.