Intolerance Screen Blood Test

The Intolerance Screen Blood Test is a specialised diagnostic tool designed to evaluate your body’s immune response to a range of common food proteins. Unlike classic food allergies, which trigger immediate, often severe reactions, food intolerances typically lead to delayed symptoms that can be harder to trace—such as bloating, fatigue, skin issues, migraines, and digestive discomfort. These reactions are often driven by non-IgE immune pathways and may emerge several hours or even days after eating a problematic food.

This blood test analyses immunological markers associated with food intolerance, helping to identify the foods most likely contributing to chronic inflammation, digestive imbalance, or systemic symptoms. Clinical studies, including those published by researchers at the University of York and King’s College London, have shown that removing foods identified through intolerance testing can improve symptoms in conditions such as irritable bowel syndrome (IBS), migraines, eczema, and fatigue-related disorders.

By identifying hidden food triggers and low-grade immune responses, this test offers a foundation for creating a personalised elimination diet, supporting gut health, reducing inflammation, and improving overall well-being.

What Does This Test For?

This test investigates your body’s immune response to a range of common dietary proteins by measuring markers associated with food intolerance. It helps to identify which foods may be contributing to subtle or delayed symptoms that can affect digestion, mood, energy levels, skin health, and systemic inflammation. Unlike allergy testing, which focuses on rapid-onset IgE-mediated responses, this screen focuses on delayed hypersensitivity and low-grade immune reactions, commonly associated with non-IgE pathways such as IgG4 or T-cell activation.

This type of intolerance testing is particularly useful for individuals suffering from chronic conditions like bloating, IBS, unexplained fatigue, eczema, headaches, or joint pain, where conventional diagnostic tests may show no abnormalities. Identifying and removing trigger foods can lead to measurable improvements in symptoms and quality of life, as supported by recent clinical trials published in the Journal of Inflammation Research and Clinical Gastroenterology and Hepatology.