For many people, laboratory tests ordered by their doctor return to normal, but symptoms persist. It can be a frustrating experience because people who are unwell often don’t have clear answers. Here is a Functional medicine approachwhich uses a number of functional wellness testingcan provide additional insights. While traditional labs are essential for diagnosing certain medical conditions, they may not always capture early dysfunction or identify the root causes of persistent symptoms. Functional testing enables deeper understanding and, when used in conjunction with traditional labs, allows providers to develop a more complete picture of a patient’s health.
Functional vs. Conventional Tests
During a typical visit to a primary care physician, a patient will often undergo laboratory tests, such as a complete blood count (CBC), metabolic panel, or markers of thyroid health and blood sugar status, along with occasional imaging tests or other diagnostic tools. These tests help detect disease and support clinical decision-making because many of the markers assess individual aspects of health. At the same time, they do not always explain why symptoms occur or how well different systems in the body work together.
Functional tests offer a complementary approach here. While traditional labs focus on determining what condition might be present, this approach aims to better understand why symptoms occur in the first place. Additionally, patterns in metabolites and byproducts of normal physiological processes are examined in greater detail, often resulting in a broader range of markers from a single assay. This provides insight into the functioning of signaling pathways in the body where processes may not be operating efficiently or become clogged, helping to inform more targeted, personalized interventions.
An example of this in practice is hormone testing. Standard labs can show that a hormone like estrogen is elevated, while a functional approach can provide more detailed information about how that hormone is processed, broken down, and excreted from the body. This can help identify where normal pathways may not be working optimally and clarify where support is most needed.
Important functional tests
There are different types of functional wellness tests available, and each offers a unique perspective on how different systems in the body function. Typically they are non-invasive and can be done at home using samples such as stool, urine or saliva to obtain results. Samples are then sent to a laboratory for analysis, where validated methods are used to ensure results are accurate and reliable.
GI microbial testing
Microbial GI testing focuses on the composition and activity of the gut microbiome. It assesses microbial balance, digestive function and inflammatory responses. Since the intestine plays a central role in immune defense, metabolism and mood, disorders in this system can manifest themselves in a variety of ways. This type of testing is often useful for people who suffer from common ailments such as bloating, irregular digestion, skin problems, or low energy levels.
A sample case report of this test in action can be found here Here.
Testing organic acids
Organic Acid Testing (OAT) examines metabolic byproducts in urine and provides insights into the function of important biochemical pathways. These markers can reflect mitochondrial activity, nutrient status, neurotransmitter metabolism and microbial growth. Because it captures multiple systems simultaneously, it can be particularly helpful in more complex cases, such as: E.g. brain fog, low energy, or other persistent problems that don’t point to a single clear cause.
Genome analysis
Genome analysisThe test, usually performed using a saliva sample, provides information about genetic tendencies that may influence how someone processes nutrients, detoxifies, or responds to inflammatory signals. Because an individual’s genetic makeup does not change, this type of testing generally only needs to be performed once. While genes do not determine outcomes, they can explain why certain patterns occur and where someone may be more susceptible. This information can be used to develop more personalized nutrition and lifestyle strategies.
Urine hormone test
Urine hormone test provides a more comprehensive view of hormone health by measuring not only hormone levels, but also how they are metabolized and excreted. This can provide insights into patterns related to estrogen and testosterone balance, cortisol rhythms, and general hormone regulation. Commonly used for PMS, perimenopause, low libido, sleep problems, mood swings, or persistent fatigue, it can provide more targeted support for both men and women.
Example case reports of this test in action can be found here Here And Here.
In practice, these tests are often used to establish a baseline, followed by a personalized protocol or treatment plan, and then repeated after a period of time to assess progress and guide next steps. This allows both the practitioner and the individual to see how the body responds and make more informed adjustments over time. However, testing can be done at any time, whether to investigate new symptoms or to take a more proactive approach to overall health.
When should functional wellness testing be considered?
A functional medicine approach that utilizes functional wellness testing can be particularly helpful for people who continue to experience symptoms despite normal laboratory results, or for people who are dealing with more complex health problems that are difficult to fully explain or resolve. It may also be worth considering if multiple systems appear to be involved or if previous approaches have not provided lasting relief. These tests can be a valuable tool for people who want to take a more proactive approach to their health. Chronic diseases account for approximately 90% of healthcare spending in the United Stateswhich typically develop over a longer period of time. In many cases, functional testing can help detect subtle imbalances and patterns early before they lead to more serious health problems.
Importantly, it is best to perform functional tests under the guidance of a qualified healthcare professional who can interpret the results. Because these tests can be more detailed and nuanced, the presence of an experienced person helps ensure that the results are actually useful and lead to practical, personalized recommendations. Working with a knowledgeable doctor can also help avoid unnecessary tests and costs, reduce the risk of misinterpretations, and ensure next steps are thoughtful and tailored to overall health.
Diploma
Functional testing adds additional depth and personalization to healthcare by helping to uncover patterns and potential root causes that may not be captured by standard labs alone. Rather than replacing traditional testing, it works best as part of an integrative approach that combines both methods. By helping to clarify what is actually going on, it allows for a more personalized and effective approach to care.
Learn more about the benefits of functional testing:
A case report of dietary supplementation with Anaerostipes caccae in a 47-year-old woman with long-term food intolerances
A case report of nutraceutical support and urine metabolite testing in a 61-year-old woman with menopausal problems
By Jesse Martin, MS
