Test. Don't guess.
In conventional medicine, lab testing is mostly used to confirm or rule out a diagnosis. In integrative work, lab testing is used differently — to map where you are and what's actually happening in your body so the healing plan can be precise rather than generic.
Most of my patients come to me having tried multiple supplements, multiple diets, multiple practitioners, and multiple protocols — without testing first. Some of it helped. Most of it did not. The patient could not say which interventions worked and which did not, because they had no baseline measurements to compare against.
When you test first, three things change:
This page is a guide to what to test, when, and through whom.
You do not need every test on this page. Most patients can get a meaningful picture from a small, well-chosen panel — what I think of as the foundational labs — plus one or two targeted panels based on their Weak Link and presenting concerns.
Start with foundational labs. They are the most informative per dollar spent. They catch the issues that matter most to the broadest range of patients.
Then test specifically. If you suspect a gut issue, run a stool analysis. If you suspect a hormone issue, run a comprehensive hormone panel. Targeted testing for targeted concerns.
Retest, don't just test once. Lab values change with intervention. Plan to retest the panels that matter most every six to twelve months while you are actively working on your health.
Work with a practitioner who can interpret. Reference ranges on conventional lab reports are based on the general population, not optimal health. A functional or integrative practitioner will interpret your results against optimal ranges and against your symptom picture — which often reveals what conventional interpretation misses.
These are the labs I run on most new patients. They give the highest-value baseline picture per dollar spent and reveal the issues that matter most to the broadest range of presenting concerns.
Most of these tests can be ordered through:
If you order through DTC, expect to pay $200-500 for the full foundational panel out of pocket. Through a functional medicine practice, costs vary widely.
When the foundational labs flag something — or when symptoms suggest a deeper pattern — these are the panels that go deeper.
For perimenopausal/menopausal symptoms, irregular cycles, low libido, fatigue, weight that won't shift, mood instability, andropause patterns.
For bloating, gas, irregular bowel movements, reflux, food sensitivities, brain fog, autoimmune patterns, skin issues, or any chronic condition that isn't responding to other interventions.
For chronic fatigue, brain fog, exercise intolerance, slow recovery, neurological symptoms, and complex chronic conditions.
For unexplained chronic symptoms, history of significant environmental exposure (mold, occupational chemicals, industrial regions), and complex multi-system presentations.
For patients with elevated cardiovascular risk, family history of heart disease, or concerning conventional lipid panels.
For patients with chronic mood symptoms, cardiovascular risk, fertility issues, or as supplemental information for personalized care.
A note: genetic testing tells you about predisposition, not destiny. The most useful question is not "what genes do I have?" but "what is being expressed?" Genetic information is most useful when paired with current functional testing.
If you do not currently have an integrative practitioner — or if you want to gather baseline data before your first visit — direct-to-consumer testing makes lab access available without a physician's order in most cases.
DTC labs work for foundational testing. They are limited for the functional medicine panels (DUTCH, organic acids, comprehensive stool analysis), most of which still require a practitioner order.
Direct ordering from LabCorp's standard menu
Direct ordering from Quest's menu
Broker for Quest and LabCorp tests at reduced rates
Broker for Quest tests, often at significant discount
At-home kits for specific panels
At-home kits for specific panels
A growing number of functional medicine labs now offer some DTC access:
Most of the deeper testing — DUTCH, comprehensive stool analysis, organic acids, mycotoxin panels — is best ordered through a practitioner. The lab partners you'll see referenced in functional medicine practice include:
A few principles I encourage every patient to keep in mind.
The temptation with lab testing is to "run everything." Don't. Test with a specific question in mind. Is my thyroid being autoimmune-attacked? is a question. Is my gut driving these symptoms? is a question. What's wrong with me? is not a question — it is a state of overwhelm.
A focused panel gives you focused answers. A scattershot panel often gives you a list of "abnormal" results without the context to act on any of them.
A lab result without interpretation is data. With interpretation, it becomes information. A practitioner trained in integrative or functional medicine will interpret your results against optimal ranges (not just population reference ranges), against your symptom picture, and against your goals.
If you order DTC and find concerning results, find a practitioner to help you interpret. (See the Practitioner Interview Guide for how to find one.)
If you are about to start a major intervention — a new diet, a supplement protocol, a cleanse — get the relevant labs first. You will want to know where you were before you can know what changed.
Most functional labs are valuable to retest every 6-12 months while you are actively working on your health. Once stable, annually. Foundational labs (CBC, CMP, lipid, thyroid, vitamin D, ferritin) are reasonable to repeat annually as part of baseline health monitoring.
Functional medicine labs are expensive. Some are not covered by insurance. Build a plan that fits your budget. A single comprehensive stool analysis ($400-600) addresses a specific question better than $200 worth of scattered testing.
A few categories of testing where the science doesn't justify the cost or the clinical claims:
If you have already had testing in these categories, the results can sometimes still be useful — but I would generally not start with them.
Information provided is for educational purposes only and does not constitute medical advice. Lab testing should be ordered, interpreted, and acted on in partnership with a qualified healthcare practitioner. Reference ranges and clinical significance vary by individual.