Understanding Lab Tests for Yeast Allergy
Written by Private MD Labs Medical Writing Team • Last Updated: September 8, 2025
A yeast allergy occurs when the immune system mistakenly identifies proteins in yeast as harmful substances, triggering an allergic reaction. Baker's yeast and brewer's yeast are common culprits found in bread, baked goods, beer, and other fermented products. Symptoms can include digestive issues, skin problems, headaches, and other systemic reactions.
Recommended Test
Food Specific IgG Allergy (Adult) Panel
This comprehensive panel includes testing for IgG antibodies to yeast (baker's and brewer's yeast). Elevated IgG antibodies indicate an immune response to yeast proteins, which can manifest as symptoms including abdominal pain, headaches, itchy skin, bloating, and other allergic reactions. This test helps identify yeast as a potential trigger for chronic symptoms.
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Diagnosing Yeast Allergy Through Blood Testing
While food allergies are often suspected based on symptoms and dietary patterns, blood testing provides objective evidence of immune system responses to specific allergens. IgG antibody testing can identify delayed immune reactions to yeast proteins, helping to confirm whether yeast exposure is contributing to chronic symptoms.
Understanding Your Results
High levels of IgG antibodies to yeast suggest that your immune system is reacting to yeast proteins. This reaction can contribute to various symptoms and may indicate the need to reduce or eliminate yeast-containing foods from your diet. Working with a healthcare provider can help you interpret results and develop an appropriate management plan.
Important Considerations
The information here is for educational purposes only and is not a substitute for professional medical advice. Always consult with a healthcare provider for diagnosis and treatment of food allergies and sensitivities.
