Standard medical testing is designed to screen for overt disease. It catches problems after they have arrived. Functional medicine testing is designed to identify the metabolic, hormonal, immune, nutritional, and gut-related imbalances that drive disease, often years before conventional labs become abnormal. This is the difference between reactive medicine and root-cause medicine.
At Vitality Family Health in Oak Brook, IL, we offer a comprehensive range of specialty lab testing that goes far beyond what conventional practices order. Each test is selected based on your symptoms, your history, and your health goals. We do not run panels indiscriminately. We test with purpose, interpret results through a functional lens (optimal, not just “normal”), and use the findings to build a treatment plan that addresses what is actually driving your symptoms. Below is an overview of the specialty testing we offer.
Have you been told your labs are “normal” while you continue to feel exhausted, foggy, inflamed, or unwell?
Do you suspect that food sensitivities, gut issues, or nutrient deficiencies are at the root of your symptoms, but no one has tested for them?
Are you dealing with chronic stress, fatigue, or burnout and wondering whether your adrenals and cortisol rhythm are part of the problem?
Do you have a family history of heart disease or diabetes and want testing that goes deeper than a basic lipid panel and fasting glucose?
Are you looking for a provider who uses lab work to find answers, not just rule things out?
The hypothalamic-pituitary-adrenal (HPA) axis governs your body’s stress response and regulates cortisol production throughout the day. Under healthy conditions, cortisol follows a predictable rhythm: highest in the morning to promote wakefulness, declining through the afternoon and evening as melatonin rises to support sleep. Chronic stress, poor sleep, overwork, trauma, and illness can dysregulate this rhythm, producing patterns of elevated evening cortisol (wired but tired), blunted morning cortisol (cannot wake up, need hours to feel functional), or a flat cortisol curve (exhausted all day regardless of rest).
HPA axis testing uses salivary or urinary cortisol measurements taken at multiple points throughout the day to map your personal cortisol rhythm. This reveals whether chronic stress has disrupted your stress response system and is contributing to fatigue, insomnia, anxiety, weight gain, brain fog, hormonal imbalance, or immune dysfunction. Standard blood cortisol tests (a single morning draw) miss the dynamic pattern entirely. This testing is especially relevant for patients who describe feeling “burnout,” chronic exhaustion that does not improve with rest, or the combination of being tired during the day and wired at night.
Food sensitivities (IgG and IgA mediated delayed reactions) are fundamentally different from food allergies (IgE mediated immediate reactions). A food allergy produces a rapid, often dramatic response (hives, swelling, anaphylaxis) within minutes. A food sensitivity produces a delayed inflammatory response that can take 24 to 72 hours to manifest, making it nearly impossible to identify the trigger through observation alone. Symptoms of food sensitivities include bloating, gas, headaches, fatigue, joint pain, skin rashes, brain fog, mood changes, and nasal congestion.
Our food sensitivity panels test IgG and IgA reactions to dozens of common foods, revealing hidden triggers that may be maintaining chronic inflammation. For many patients with eczema, rosacea, IBS, autoimmune conditions, migraines, or unexplained fatigue, identifying and removing reactive foods is one of the most impactful steps in their treatment plan. We guide you through the elimination process and help you reintroduce foods systematically to identify which ones your body can and cannot tolerate.
The gut is central to nearly every system in the body. It houses roughly 70 percent of the immune system, produces the majority of the body’s serotonin, and plays a direct role in hormone metabolism, nutrient absorption, and systemic inflammation. Comprehensive stool testing provides a detailed map of your gut ecosystem that a standard stool culture cannot match.
Our stool panels evaluate the composition and diversity of your gut microbiome (beneficial bacteria, commensal organisms, and pathogenic species), markers of intestinal inflammation (calprotectin, lactoferrin), digestive enzyme function (elastase), the presence of parasites, yeast overgrowth (Candida), and pathogenic bacteria (C. difficile, H. pylori), short-chain fatty acid production, and indicators of intestinal permeability (leaky gut). This testing is foundational for patients with chronic digestive symptoms, autoimmune conditions, skin disorders (eczema, rosacea, acne), mood and cognitive concerns, recurrent infections, and unexplained fatigue. It is also critical for patients with Hashimoto’s, given the strong gut-thyroid axis.
Nutrient deficiencies are far more common than most patients and providers realize, and they directly drive symptoms that are frequently attributed to other causes. Fatigue may stem from iron or B12 deficiency. Anxiety and insomnia may be fueled by magnesium depletion. Hair loss may reflect low ferritin or zinc. Immune dysfunction may be worsened by inadequate vitamin D. Conventional medicine rarely tests beyond a basic metabolic panel and CBC, leaving these deficiencies invisible.
Our micronutrient testing evaluates intracellular levels of vitamins, minerals, amino acids, and antioxidants, providing a more accurate picture of your nutritional status than standard serum tests alone. We assess vitamin D, B12, folate, iron/ferritin, magnesium, zinc, selenium, vitamin A, omega-3 fatty acid status, and markers of oxidative stress (the imbalance between free radical production and antioxidant defense that contributes to aging, inflammation, and chronic disease). Identifying and correcting deficiencies is often one of the simplest and most impactful interventions in a functional medicine treatment plan.
Celiac disease affects an estimated 1 in 100 people worldwide, but up to 80 percent of cases remain undiagnosed. Non-celiac gluten sensitivity is even more common and is increasingly recognized as a driver of chronic inflammation, digestive symptoms, neurological issues, skin conditions, and autoimmune activation. Standard celiac screening (tissue transglutaminase IgA) misses a significant number of cases, particularly in patients with IgA deficiency or early-stage disease.
Our advanced celiac and gluten testing panel includes tissue transglutaminase (tTG) IgA and IgG, deamidated gliadin peptide (DGP) IgA and IgG, endomysial antibodies (EMA), total serum IgA (to rule out IgA deficiency, which can cause false-negative results on standard screening), and when indicated, genetic testing for HLA-DQ2 and HLA-DQ8 (the genetic markers associated with celiac susceptibility). This comprehensive approach catches cases that basic screening misses. For patients with Hashimoto’s, this testing is particularly important, as autoimmune thyroid disease carries a four to five times higher risk of concurrent celiac disease.
Heart disease is the leading cause of death in the United States, and type 2 diabetes affects over 37 million Americans with tens of millions more in the prediabetic stage. Standard screening (total cholesterol, LDL, HDL, fasting glucose) detects these conditions only after they have progressed significantly. Functional cardio-metabolic testing identifies risk years earlier, when interventions are most effective.
Our advanced panels include lipoprotein(a), a genetically determined and highly atherogenic particle that standard panels never measure; LDL particle number and size (small, dense LDL is far more dangerous than large, buoyant LDL); apolipoprotein B; high-sensitivity C-reactive protein (hs-CRP) and homocysteine (markers of vascular inflammation); fasting insulin (the earliest marker of insulin resistance, detectable years before glucose or A1c becomes abnormal); hemoglobin A1c; uric acid; and fibrinogen. This level of testing transforms cardiovascular and metabolic risk assessment from a rough estimate into a precise, actionable picture that can guide targeted prevention.
For patients with neurological or psychiatric symptoms that have not responded to standard treatment, neural antibody testing evaluates whether an autoimmune process may be affecting the brain and nervous system. Autoimmune neurological conditions can cause cognitive decline, memory problems, seizures, movement disorders, psychiatric symptoms (anxiety, depression, psychosis, OCD), neuropathy, and chronic pain. These conditions are frequently misdiagnosed as purely psychiatric or dismissed as unexplained.
Neural antibody panels test for antibodies against specific neuronal proteins and receptors, including NMDA receptors, voltage-gated potassium channels, GAD65 antibodies, and others depending on the clinical presentation. This testing is particularly relevant for patients with sudden-onset neuropsychiatric symptoms, treatment-resistant mood or cognitive conditions, or neurological symptoms occurring alongside autoimmune thyroid disease or other autoimmune conditions. When an autoimmune neurological process is identified, it fundamentally changes the treatment approach.
Ordering the right test is only half the equation. Interpreting the results through a functional medicine lens is what turns data into a treatment plan. We do not simply flag results as “normal” or “abnormal.” We evaluate where your levels fall relative to optimal ranges, how different markers relate to each other, and what the overall pattern reveals about your health. We sit down with you (in person or via telehealth) and walk through every result so you understand what it means, why it matters, and what we recommend doing about it.
Testing is never ordered in isolation. It is part of a broader clinical picture that includes your symptoms, your history, your physical exam, and your goals. The result is a personalized plan that may include dietary changes, targeted supplementation, gut restoration protocols, hormone optimization, stress and lifestyle modifications, or further testing when deeper investigation is needed.
Specialty lab testing is safe and involves standard blood draws, saliva collection, stool samples, or urine collection depending on the test. Some tests require specific preparation (fasting, timed collection, avoiding certain foods or supplements beforehand). We provide clear, detailed instructions before every test. If results reveal a finding that requires urgent attention, our team contacts you promptly and coordinates appropriate next steps. Lab testing does not replace clinical judgment; results are always interpreted in the context of your complete health picture.
“Normal” on a standard panel often means you do not have overt disease. It does not mean your body is functioning optimally. Conventional panels are narrow by design and do not evaluate adrenal function, food sensitivities, gut microbiome health, micronutrient levels, advanced cardiovascular markers, or autoimmune triggers. Specialty testing reveals the patterns that explain persistent symptoms when standard labs come back clean.
Testing is guided by your symptoms, health history, family history, physical exam, and clinical judgment. We do not order panels indiscriminately. We select the tests most likely to reveal actionable information for your specific situation. We discuss the rationale for each test before ordering it so you understand why it matters.
Some standard lab markers may be eligible for insurance reimbursement. Many specialty functional medicine tests (food sensitivity panels, comprehensive stool analysis, adrenal testing, advanced cardiovascular markers) are not routinely covered by insurance. Through our direct primary care membership model, we offer wholesale lab pricing that is often more affordable than what patients pay even with insurance at conventional labs. We are transparent about costs before any testing is ordered.
Standard blood work typically returns within a few business days. Specialty tests (stool analysis, food sensitivity panels, adrenal testing, neural antibodies) may take one to three weeks depending on the lab. Once results are in, we schedule a detailed review with you to walk through every finding and discuss your plan.
Blood draws are performed on-site at our Oak Brook office and also at local Quest Diagnostics testing centers. Stool tests, saliva-based adrenal testing, and urine collections are typically done at home using kits we provide with clear instructions. Results from all tests are reviewed with you in person or via telehealth.
Yes. Lab result reviews and treatment planning can be conducted via telehealth for patients throughout Illinois. The blood draw itself requires an in-person visit, but everything that follows can often be handled remotely.
The discovery consult is a brief, no-cost conversation where you can share your health concerns, ask about which testing might be right for you, and find out whether Vitality Family Health is the right fit. There is no pressure and no obligation.
You may also want to read about On-Site Lab Work, Gut and Digestive Disorders, Hormones, Hormone Imbalances, Hypothyroidism, Heart Health, and Chronic Fatigue, since the conditions we evaluate with specialty testing connect directly to these areas of care.
Medically Reviewed By: Dr Kori Feldman, M.D.
Vitality Family Health & Wellness Partners is located in Oak Brook, Illinois, and serves patients throughout the Greater Chicagoland Area and the entire state of Illinois. These areas include but are not limited to the downtown Chicago area, surrounding suburbs, central, northern, and southern Illinois, and southern Wisconsin and Northwest Indiana.