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Standard Blood Tests vs. Functional Testing: Unraveling the Differences

In the world of healthcare and clinical nutrition, testing is a vital tool for assessing our health. Traditionally, standard blood tests have been the go-to method for diagnosing and monitoring various conditions. However, in recent years, functional testing has gained prominence for its ability to provide a more in-depth and holistic understanding of our health. In this blog post, we will explore the main differences between standard doctor-administered blood tests and functional testing methods such as GI mapping, organic acid testing, and Dutch testing.

Standard Blood Tests: The Basics

1. Routine Screening: Standard blood tests are typically used for routine health check-ups and screenings. They are designed to detect common conditions such as diabetes, high cholesterol, and anemia.

2. Limited Scope: Standard blood tests often focus on a narrow set of markers like glucose levels, cholesterol levels, and complete blood counts. These tests may not provide a comprehensive picture of overall health and may miss underlying issues.

3. Diagnostic in Nature: Doctors primarily use standard blood tests to diagnose specific diseases or conditions. These tests may not provide insight into the root causes of health problems.

4. Symptom-Based: Standard blood tests are typically ordered in response to specific symptoms or known risk factors. They may not be suitable for proactive health assessment.

Functional Testing: A Holistic Approach

1. Targeted and Comprehensive: Functional testing methods, like GI mapping, organic acid testing, and Dutch testing, take a more targeted and comprehensive approach. They assess various markers to provide a broader view of health.

2. Root Cause Analysis: Functional tests aim to identify the underlying causes of health issues rather than simply diagnosing symptoms. This can be particularly valuable for chronic conditions and complex health concerns.

3. Personalised Insights: Functional testing often yields personalised results, allowing healthcare professionals to tailor treatment plans to the individual's unique needs.

4. Early Detection: These tests can detect imbalances and dysfunctions in the body before they manifest as noticeable symptoms, enabling proactive intervention.

Types of Functional Testing

GI Mapping: This test assesses the gut microbiome by analysing stool samples. It provides insights into the composition of gut bacteria, inflammation, digestive function, and the presence of pathogens. GI mapping is valuable for addressing digestive disorders, autoimmune diseases, and even mental health issues linked to gut health.

Organic Acid Testing: This urine test measures organic acids produced by cellular metabolism. It can reveal nutrient deficiencies, mitochondrial dysfunction, and imbalances in neurotransmitters. Organic acid testing is often used to uncover underlying factors in conditions like chronic fatigue syndrome and autism.

Dutch Testing: The Dutch test evaluates hormones and their metabolites through urine samples collected throughout the day. It can uncover hormonal imbalances, adrenal function, and potential hormone-related issues. Dutch testing is particularly useful for addressing hormonal disorders, mood disorders, and menopause-related symptoms.


While standard blood tests serve their purpose in diagnosing and monitoring common health conditions, functional testing offers a more holistic and proactive approach to health assessment. By examining a broader range of markers and considering the root causes of health issues, functional testing empowers healthcare professionals to provide more personalised and effective treatments.

In the world of clinical nutrition, the choice between standard blood tests and functional testing depends on the individual's health goals, symptoms, and specific concerns. Ultimately, both approaches have their place in modern healthcare, working in tandem to promote optimal health and well-being. If you have questions about which testing method is right for you, consult with a healthcare provider or nutrition specialist to create a tailored health plan that suits your unique needs.


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