A Growing Concern: The Prevalence of Food Allergies 

Food allergies are increasingly common today, significantly impacting the lives of millions across the globe. Blood tests play a crucial role in diagnosing these allergies, offering a window into how our bodies react to different food items. Today, you'll learn about the science behind these tests and how they can aid in enhancing your dietary choices and overall health.

And if you're still itching to dive even deeper into the marvellous world of health after reading this article, don't hesitate to explore some more top-notch health news. Get to know the ins, outs, and fascinating quirks of your body. The right knowledge is the ultimate key to nurturing your overall well-being. Trust me, your body is a wonderland and understanding it is the first step to keeping it humming like a well-oiled machine.

Decoding Food Allergies and Sensitivities 

Food allergies and sensitivities, while often used interchangeably, are distinct. An allergy triggers an immune system response, causing symptoms ranging from mild rashes to severe anaphylaxis. On the other hand, food sensitivities, also known as intolerances, lead to digestive problems and can be more difficult to identify. Common food allergens include peanuts, shellfish, eggs and milk, although many other foods can also trigger reactions. Our quality of life can be greatly affected by these allergies, causing discomfort, anxiety and the need for constant vigilance.

That’s where a great blood test, such as a full blood profile, comes into play. Blood testing for food allergies is designed to measure the presence of specific antibodies, known as Immunoglobulin E (IgE), which your body produces in response to certain foods. The level of these antibodies often correlates with the severity of the allergy. Something important to note is that while these tests can provide valuable insights, they should be considered as part of a larger diagnostic process, including clinical history and additional tests if necessary, to ensure their accuracy and reliability.

Navigating the Landscape of Food Allergy Blood Tests

In the world of allergy diagnosis, several blood tests are used to decipher your body's reactions to different foods. Here, let’s delve into five of the most common ones: A Full Blood Profile, the Radioallergosorbent Test (RAST), the Enzyme-Linked Immunosorbent Assay (ELISA), the ImmunoCAP Specific IgE test, and the ALCAT-test.

Full Blood Profile 

Arguably the most valuable tool in the diagnosis and monitoring of health is a Full Blood Profile, also known as a Complete Blood Count (CBC) or Full Blood Examination (FBE). This test provides a broad overview of your general health status. It measures various components of your blood, including red and white blood cells, platelets, haemoglobin and haematocrit.

While a Full Blood Profile is not a specific food allergy test, it plays a valuable role in ruling out other conditions that may cause similar symptoms, such as infections or anaemia. For instance, if a patient experiences fatigue, shortness of breath and rapid heart rate after eating certain foods, these could either indicate an allergic reaction or an underlying condition like anaemia. A Full Blood Profile can help clarify the cause.

In the case of suspected allergic reactions, elevated levels of certain white blood cells, such as eosinophils, can suggest an allergic response. However, it's crucial to remember that these changes are non-specific and can occur in many other conditions. Therefore, while Full Blood Profiles are useful in the broader context of health evaluation, they should be used alongside specific allergy tests and comprehensive clinical assessment to accurately diagnose food allergies or sensitivities.

The Radioallergosorbent Test (RAST)

The RAST was one of the first blood tests used widely for allergy testing. It works by detecting the presence of Immunoglobulin E (IgE) antibodies to specific allergens in your blood. These antibodies are released by your immune system in response to an allergenic substance. While RAST tests provide valuable insights, they have been largely replaced by more advanced techniques due to their lower sensitivity.

The Enzyme-Linked Immunosorbent Assay (ELISA)

The ELISA test is one of the most widely used methods in medical laboratories due to its specificity. It works by attaching a specific antigen to a surface and then introducing a patient's blood sample. If the patient's blood contains antibodies to the antigen, it will bind to it. An enzyme is then added, which causes a colour change, indicating the presence of the antibody. The ELISA test can accurately measure the amount of IgE antibodies in the blood, making it a valuable tool for diagnosing food allergies.

ImmunoCAP Specific IgE test

This test, also known as the Phadia Immunology Reference Laboratory test, is a highly sensitive method for detecting specific IgE antibodies. It uses an allergen, such as a food protein, that is bound to a solid phase. The patient's serum is then added, and if specific IgE antibodies to the allergen are present, they will bind to the allergen. After washing away unbound substances, enzyme-labelled antibodies are added, which bind to the IgE antibodies. Finally, a developing agent is added, and the reaction is measured. The intensity of the reaction indicates the concentration of the specific IgE antibodies in the patient's blood.


Unlike the tests above, the ALCAT test does not measure IgE antibodies. Instead, it examines changes in the size and quantity of leukocytes (a type of white blood cell) when they are exposed to specific food extracts. Though this test is not traditionally used for allergy testing, some healthcare professionals use it to identify food sensitivities or intolerances.

Each of these tests offers unique insights into your body's reactions to different food items, and the choice of the test may depend on various factors, including the type of allergic reaction suspected, the age of the patient, and the accessibility and cost of the test. Regardless of the type of test used, interpreting the results should always be done by a healthcare professional and alongside a thorough clinical history, to ensure a comprehensive and accurate diagnosis.

The Power of Diagnosis: Blood Tests and Dietary Choices

The ability to diagnose food allergies through blood tests is transformative, and many individuals have seen significant improvements in their lives as a result. Take Jane, for instance. For years, she suffered from unexplained digestive discomfort that disrupted her daily activities. An array of diagnostic approaches turned up no conclusive results until she undertook a blood test. The test unveiled a sensitivity to gluten that had remained undetected for years.

Armed with this new information, Jane was able to make informed changes to her diet, eliminating gluten and incorporating gluten-free alternatives. The effects were profound. The digestive discomfort that once plagued her disappeared, and she was able to enjoy her meals without worry. She also experienced an increase in energy levels, an improvement in mood, and a notable enhancement in her overall quality of life. Jane's story exemplifies the potential of blood tests in guiding dietary choices and optimising health.

"Before getting tests done, I lived in constant discomfort with no idea what was causing it. The day I got my blood test results was a turning point in my life. My doctor told me I had a gluten sensitivity and I helped me make informed decisions about changing my diet. Removing gluten has not only eased my digestive issues but also improved my energy levels and mood, and it's like I've been given a new lease on life. " - Jane

Boosting Health with Blood Tests for Food Allergies

In addition to Jane’s glowing view, the identification and management of food allergies using blood tests have truly far-reaching benefits. Physically, the elimination of allergenic foods from the diet can significantly alleviate allergy symptoms, ranging from digestive issues to skin problems and respiratory complaints. This not only enhances comfort but also boosts overall health and well-being by ensuring the body is not constantly in a state of immune response.

Apart from that, the mental health benefits cannot be underestimated. For those with undiagnosed food allergies, mealtimes often become a source of anxiety due to unexpected and unpleasant reactions. Identifying the offending foods can bring a huge sense of relief and control, reducing mealtime anxiety and enhancing one’s mental well-being.

Beyond diagnosis, blood tests for food allergies serve as an ongoing tool for health management. Regular testing can monitor the progress of an allergy, track the effectiveness of dietary changes and guide adjustments to ensure optimal health. As such, these tests not only diagnose allergies but also act as a compass, steering individuals towards improved physical and mental health.

Concluding Thoughts 

Blood tests play a significant role in diagnosing food allergies and sensitivities, providing an avenue for better dietary choices and improved health. These tests are not simply a diagnostic tool; they can be the gateway to you having a more comfortable, healthier life.



Isreal olabanji a dental assistant and public health professionals and has years of experience in assisting the dentist with all sorts of dental issues.We regularly post timely and trustworthy medical information and news on Fitness, Dental care, Recipes, Child health, obstetrics, and more.

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