What is the reference range for Food-Specific Immunoglobulin A?

The standard reference range for Food-Specific Immunoglobulin A is Lab-specific threshold; typically 50 elevated.. Reference ranges vary by laboratory and assay platform — interpret in context of the issuing laboratory's stated range.

Which tests measure Food-Specific Immunoglobulin A?

Food-Specific Immunoglobulin A is measured in 1 test on BiomarkersLabs.com, including 198 Vegetarian Food Panel: IgA/IgG/IgG4.

Biomarker Reference · IgA

What does the Food-Specific Immunoglobulin A test measure?

Q: Why is Food-Specific Immunoglobulin A measured?

Food-specific IgA is used in functional and integrative medicine to identify foods that may be driving gastrointestinal symptoms or systemic inflammation through mucosal immune activation. Serum IgA antibodies to foods are not part of standard allergy diagnostics and their clinical validity as predictors of food intolerance remains under investigation.

Food-Specific Immunoglobulin A (IgA) is a clinical biomarker used in food-sensitivity-allergy assessment. Immunoglobulin A is the dominant antibody at mucosal surfaces, secreted into the gut lumen where it neutralises pathogens and dietary antigens. It is measured in 1 laboratory test on BiomarkersLabs.com.

Reference Range: Lab-specific threshold; typically <20 AU considered negative, 20–50 borderline, >50 elevated.
Units: Arbitrary units (AU), Relative units
Measured In: 1 test
Category: Food Sensitivity

Functional medicine optimalUS BioTek reports results as negative, borderline, or elevated based on internal reference populations; optimal is typically reported as negative (<20 AU).

What is Food-Specific Immunoglobulin A?

Immunoglobulin A is the dominant antibody at mucosal surfaces, secreted into the gut lumen where it neutralises pathogens and dietary antigens. Serum IgA to food proteins reflects mucosal exposure and may indicate a break in oral tolerance or active mucosal inflammation. Unlike IgE, which mediates immediate allergic reactions, IgA responses are part of the secretory immune system and are thought by some to correlate with ongoing gut permeability or inflammatory gut conditions, though evidence for this is contested.

Why is Food-Specific Immunoglobulin A measured?

Food-specific IgA is used in functional and integrative medicine to identify foods that may be driving gastrointestinal symptoms or systemic inflammation through mucosal immune activation. Serum IgA antibodies to foods are not part of standard allergy diagnostics and their clinical validity as predictors of food intolerance remains under investigation.

Reference ranges

Standard reference: Lab-specific threshold; typically <20 AU considered negative, 20–50 borderline, >50 elevated.
Functional medicine optimal: US BioTek reports results as negative, borderline, or elevated based on internal reference populations; optimal is typically reported as negative (<20 AU).
Units: Arbitrary units (AU), Relative units

Reference ranges vary by laboratory and assay platform. Interpret in context of the issuing laboratory's stated range.

Tests that measure Food-Specific Immunoglobulin A

1 test on BiomarkersLabs.com include this biomarker.

BML-FSA-015Comprehensive

198 Vegetarian Food Panel: IgA/IgG/IgG4

Food-Specific Immunoglobulin A reference range in this test: Lab-specific threshold; typically <20 AU considered negative, 20–50 borderline, >50 elevated.

Related clinical conditions

Related Biomarkers

Frequently measured alongside

Food-Specific Immunoglobulin GIgG1 test Food-Specific Immunoglobulin G Subclass 4IgG41 test Vegetarian Food Reactivity ProfileReactivity Profile1 test

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