Does a positive IgG result mean the patient is allergic to that food?

No. IgG antibodies to food are common in healthy individuals and indicate exposure rather than allergy. Practitioners who use IgG panels interpret them as exploratory markers to guide time-limited elimination trials, tracking symptom response rather than diagnosing allergy.

Can someone have a positive IgE result but tolerate the food?

Yes. Positive IgE indicates sensitisation, but not all sensitised individuals have clinical reactions. History of symptoms and, when needed, supervised oral challenge are required to confirm true IgE-mediated allergy.

Is fasting required before the blood draw?

No. The panel does not require fasting, and some practitioners prefer patients to be consuming all suspected foods at the time of testing to maximise antibody detection.

How should results guide dietary changes?

For IgE, positive results combined with a history of immediate reactions support avoidance of that food and consideration of emergency medication. For IgG, practitioners may trial a structured elimination diet removing high-reactive foods for four to six weeks, then systematically reintroduce them while monitoring symptoms to identify true triggers.

Why do allergy societies not recommend IgG testing?

Major allergy organisations state that IgG antibodies to food are a normal immune response to exposure and do not diagnose allergy or intolerance. The evidence base supporting IgG-guided elimination diets remains limited, so these tests are positioned as functional tools rather than diagnostic standards.

Can this panel diagnose coeliac disease or lactose intolerance?

No. Coeliac disease requires specific antibodies (tissue transglutaminase, endomysial) and duodenal biopsy; lactose intolerance is due to enzyme deficiency, not antibodies. Those conditions should be investigated separately before attributing symptoms to IgG or IgE reactivity.

How long do results take?

Results are typically available seven to ten business days from specimen receipt at Alletess Medical Laboratory, though turnaround may be longer during peak periods.

BML-FSA-011food sensitivity allergyUSA

184 IgG Food Sensitivity & 15 Common IgE Combo Panel

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

IgE antibodies mediate immediate allergic reactions (urticaria, anaphylaxis) within minutes to two hours of ingestion and are well established in allergy diagnosis. IgG antibodies are detected in most healthy individuals and are thought to reflect normal exposure; their role in delayed food reactions is contested, and major allergy societies do not endorse IgG testing for food intolerance.

The 184 IgG Food Sensitivity & 15 Common IgE Combo Panel measures IgG antibodies to 184 foods and IgE antibodies to 15 common allergens in a single serum sample. IgE results screen for immediate hypersensitivity; IgG findings are used by some practitioners to guide elimination diets, though major allergy societies do not endorse IgG testing for food intolerance diagnosis.

Biomarkers

Blood (serum)

Sample

7–10 business days

Turnaround

Fasting

What is the 184 IgG + 15 IgE Panel test?

The 184 IgG Food Sensitivity & 15 Common IgE Combo Panel is a broad serological screen combining two mechanistically distinct antibody responses: IgG antibodies to 184 foods, interpreted by some practitioners as markers of delayed sensitivity, and IgE antibodies to 15 common allergens, which underpin immediate hypersensitivity. It is ordered by practitioners who wish to evaluate both suspected IgE-mediated allergy and possible non-IgE, delayed reactions in a single draw. IgE-mediated allergy produces acute symptoms — urticaria, angio-oedema, respiratory distress, or anaphylaxis — and is well established in the allergy literature. The IgG component, by contrast, remains controversial: while some integrative clinicians find IgG-guided elimination diets helpful in patients with chronic unexplained symptoms, major allergy and gastroenterology bodies state that IgG antibodies to food are a normal consequence of exposure and do not diagnose food intolerance. This panel is therefore most commonly used in functional-medicine settings and should be positioned as exploratory rather than diagnostic, with results guiding trial elimination and symptom tracking rather than replacing formal allergy evaluation or oral challenge.

What does the 184 IgG + 15 IgE Panel test measure?

IgG(IgG Antibodies to 184 Foods)

Range: Negative, Borderline, or Positive classification per food; thresholds are method- and laboratory-specific.Optimal: No consensus optimal range exists. Interpretation is relative to the laboratory's classification (negative/borderline/positive) and should be correlated with symptom response to elimination and reintroduction.Arbitrary Units (AU) / Semi-quantitative Scale

Immunoglobulin G comprises roughly 75% of serum immunoglobulins and is the principal antibody of secondary immune responses. IgG antibodies to dietary antigens are detected in most healthy individuals and are thought to reflect normal mucosal exposure and tolerance. Whether elevated IgG titres to specific foods cause symptoms or merely mark exposure remains contested; some practitioners interpret them as markers of delayed food sensitivity, while mainstream immunology views them as physiological responses to frequently consumed proteins.

IgG food antibody panels are used by integrative and functional medicine practitioners to guide elimination diets in patients with unexplained gastrointestinal, dermatological, or systemic symptoms. Evidence supporting their clinical utility is limited, and major allergy societies do not endorse IgG testing for the diagnosis of food allergy or intolerance. When used, results should be interpreted alongside the clinical history and dietary provocation rather than as a standalone diagnostic finding.

IgE(IgE Antibodies to 15 Common Foods)

Range: Class 0 (<0.35 kU/L) is negative; Class 1–6 represent increasing IgE levels, with Class 2 and above generally considered positive.Optimal: Class 0 is optimal for foods that are tolerated. Higher classes correlate with increased likelihood of clinical reactivity, though predictive values vary by food and patient age.kU/L / Class 0–6

Immunoglobulin E mediates immediate-type hypersensitivity reactions. 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, producing symptoms within minutes to two hours. Sensitisation (detectable IgE) does not always equal clinical allergy — many individuals with positive IgE to a food tolerate it without symptoms.

Specific IgE to foods is the serological cornerstone of IgE-mediated food allergy evaluation, alongside skin prick testing and oral food challenge. A positive IgE indicates sensitisation; clinical reactivity is confirmed by history and, when necessary, supervised challenge. The 15-food subset in this panel typically includes the most common triggers — milk, egg, peanut, tree nuts, soy, wheat, fish, and shellfish — making it a useful first-line screen in patients with suspected immediate allergy.

Why is the 184 IgG + 15 IgE Panel test ordered?

Patients presenting with chronic, unexplained gastrointestinal symptoms (bloating, diarrhoea, abdominal discomfort) in whom coeliac disease and inflammatory bowel disease have been excluded
Adults or children with recurrent urticaria, eczema, or dermatitis not adequately explained by environmental allergens or contact triggers
Individuals with suspected delayed food reactions (symptoms hours to days after ingestion) where a food diary has identified multiple potential triggers
Patients with a convincing history of immediate reactions to common foods (milk, egg, peanut, tree nuts, fish, shellfish) who require serological confirmation of IgE sensitisation
Functional-medicine or integrative practitioners designing personalised elimination diets and seeking a broad antibody profile to prioritise foods for trial removal
Paediatric patients with growth concerns, behavioural symptoms, or recurrent infections in whom food sensitivity is suspected, alongside appropriate gastroenterology and allergy referral

Sample collection and turnaround

Sample type

Blood (serum)

Fasting required

Collection method

Venipuncture at patient service centre

Turnaround

7–10 business days

Collection notes

Phlebotomy required. The specimen is sent to Alletess Medical Laboratory for ELISA-based IgG and IgE quantification. No dietary preparation is required, though practitioners may choose to test while the patient is consuming all suspected trigger foods to maximise antibody detection.

Specimen requirements

Minimum 5 mL serum in a red-top or serum separator tube. Separate serum from cells within two hours. Stable refrigerated for up to seven days; freeze if longer storage is needed before shipment.

What can affect 184 IgG + 15 IgE Panel results?

variableRecent ingestion or elimination of tested foods

Antibody titres, particularly IgG, reflect recent and cumulative exposure; foods that have been eliminated for weeks or months may show lower titres, while frequently consumed foods tend to show higher IgG responses.

reducesImmunosuppressive therapy or immunodeficiency

Corticosteroids, biologics, or primary immunodeficiency can lower total and specific antibody production, leading to false-negative or attenuated results for both IgG and IgE.

variableAge and immune maturation

Infants and young children have lower total IgG and developing oral tolerance; IgE sensitisation patterns also change with age, so paediatric reference data differ from adult.

elevatesCross-reactive carbohydrate determinants (CCDs)

Plant glycoproteins can generate IgE responses to CCDs, producing positive results to multiple unrelated foods without clinical reactivity; newer assays attempt to minimise CCD interference.

elevatesConcurrent atopic disease or high total IgE

Patients with atopic dermatitis, allergic rhinitis, or asthma often have elevated total IgE and multiple low-level specific IgE responses, some of which are not clinically relevant.

elevatesGastrointestinal inflammation or increased permeability

Active enteropathy or 'leaky gut' may increase systemic exposure to dietary antigens and raise IgG titres; this association does not prove that the antibodies cause symptoms.

What do 184 IgG + 15 IgE Panel results mean?

Elevated

For IgE: Class 2 or higher to any of the 15 foods indicates sensitisation and raises the likelihood of IgE-mediated allergy; clinical history of immediate reactions strengthens the diagnosis, while asymptomatic sensitisation requires cautious interpretation and, if necessary, oral challenge. For IgG: Positive or high titres to multiple foods are common and do not by themselves diagnose allergy or intolerance. Practitioners may use the pattern to guide a time-limited elimination trial, tracking symptom response and reintroducing foods systematically to identify true triggers.

Normal

Negative IgE to all 15 foods does not exclude non-IgE food allergy (eosinophilic oesophagitis, food-protein-induced enterocolitis) or other causes of food intolerance. Similarly, a largely negative IgG panel does not rule out delayed reactions mediated by other mechanisms.

Reduced

Low or negative IgG responses may reflect infrequent consumption or successful immune tolerance; low IgE is the expected finding in non-allergic individuals. Neither is clinically concerning unless a convincing history of reaction exists, in which case retesting after deliberate exposure or proceeding to supervised challenge may be warranted.

Note: IgG food antibody testing is not endorsed by major allergy societies and should not replace formal allergy evaluation or oral food challenge. Results are exploratory and must be integrated with the clinical history, symptom diary, and response to elimination. IgE results indicate sensitisation but not necessarily clinical allergy; positive predictive values vary by food and patient population. This is a functional/personalised tool, not a diagnostic standard.

Frequently asked questions

IgE antibodies mediate immediate allergic reactions (urticaria, anaphylaxis) within minutes to two hours of ingestion and are well established in allergy diagnosis. IgG antibodies are detected in most healthy individuals and are thought to reflect normal exposure; their role in delayed food reactions is contested, and major allergy societies do not endorse IgG testing for food intolerance.

How to access the 184 IgG + 15 IgE Panel test

The 184 IgG + 15 IgE 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)
Burks AW, et al. ICON: food allergy. J Allergy Clin Immunol. (2012)
Sampson HA, et al. Food allergy: a practice parameter update—2014. J Allergy Clin Immunol. (2014)
Berin MC, Sampson HA. Mucosal immunology of food allergy. Curr Biol. (2013)
Sicherer SH, Sampson HA. Food allergy: A review and update on epidemiology, pathogenesis, diagnosis, prevention, and management. J Allergy Clin Immunol. (2018)

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.