Now welcoming new patients · Riverhead & Huntington · Garden City (virtually) · Telehealth available nationwide · (631) 722-2246

Naturopathic Wellness Center of Long Island

Functional Testing

Functional Testing on Long Island

Personalized, root-cause lab testing that goes beyond standard reference ranges — so your care plan reflects what's actually happening in your body.

Functional lab testing vials with botanical herbs

Many of our patients arrive after months — sometimes years — of standard lab work coming back "normal" while symptoms persist. Functional testing helps us look at the gradient between health and disease: how your hormones, gut, thyroid, adrenals, and metabolism are actually performing day to day.

We use testing strategically. Not every patient needs every panel. After a thorough intake, we recommend only the tests likely to change your plan — and we walk you through every result so you understand what it means and what we're going to do about it.

Please note: our office does not perform blood draws and does not order blood-based lab panels. All of the testing we use is non-invasive and collected at home — dried urine, saliva, stool, or breath. If your physician has already run blood work, we're happy to review those results with you, and we'll refer you back to your provider when blood testing is the right next step.

When Functional Testing Can Help

  • Persistent fatigue, brain fog, or low energy despite normal labs
  • Bloating, irregularity, reflux, or suspected food sensitivities
  • Cycle irregularity, PMS, perimenopause, menopause, or andropause symptoms
  • Thyroid symptoms with "borderline" or unclear conventional results
  • Autoimmune or inflammatory patterns and unexplained flares
  • Stress-response and sleep patterns that aren't recovering

Panels We Commonly Use

Gut & Microbiome

  • Comprehensive DNA stool analysis (GI-MAP)
  • SIBO breath testing (lactulose / glucose)
  • Intestinal permeability ("leaky gut") stool markers
  • H. pylori, parasites, and dysbiosis screens

Hormones & Adrenals

  • DUTCH complete & cycle-mapping (dried urine)
  • Salivary cortisol & DHEA (adrenal rhythm)
  • Hormone metabolite pathways for female & male patients
  • Perimenopause, menopause, and andropause workups

Cellular Energy & Metabolism

  • Urinary organic acids (mitochondrial energy production)
  • Neurotransmitter and detoxification metabolites
  • Yeast and bacterial overgrowth markers
  • Functional nutrient-need markers

Nutrition & Food Reactions

  • Structured elimination and reintroduction protocols
  • Symptom-and-food journaling with clinical review
  • Food-first nutrition planning around identified triggers
  • Review of outside labs you already have

Thyroid Support

  • Clinical review of thyroid labs ordered by your physician
  • Iodine, selenium, and conversion-cofactor considerations
  • Symptom mapping alongside adrenal rhythm testing

Coordination With Your Physician

  • We do not perform blood draws or order blood panels
  • We interpret and integrate results your provider has already run
  • Referral back to your PCP or specialist when blood work is warranted

Tests We Use, Compared

A quick reference to the specialty panels we order most often — what each one measures, when we reach for it, and roughly how long results take.

Comparison of functional diagnostic tests offered
TestSample typeWhat it measuresWhen we use itTurnaround
DUTCH Complete / PlusDried urine (4 samples over 24h, at-home)Sex hormones + metabolites, cortisol rhythm, DHEA, melatonin, organic acids (Plus)Perimenopause, PMS, PCOS, low libido, cortisol/adrenal rhythm workups3–4 weeks
GI-MAP (DNA stool)Single stool sample (at-home)Pathogens, H. pylori + virulence, opportunists, dysbiosis, parasites, calprotectin, secretory IgA, zonulin, elastaseBloating, IBS, IBD workup, autoimmune, chronic skin, suspected dysbiosis2–3 weeks
SIBO Breath TestBreath (lactulose or glucose, at-home)Hydrogen and methane production in the small intestineBloating that worsens with fiber/probiotics, IBS-C or IBS-D, post-food-poisoning IBS2 weeks
Salivary Cortisol / Adrenal RhythmSaliva (multiple samples across the day, at-home)Free cortisol curve and DHEA — the daily stress-response rhythmWired-and-tired patterns, afternoon crashes, poor sleep onset, burnout2–3 weeks
Urinary Organic AcidsFirst-morning urine (at-home)Cellular energy production, neurotransmitter metabolites, detoxification, yeast/bacterial markers, nutrient need markersPersistent fatigue, brain fog, mood changes, post-illness recovery2–3 weeks

Turnaround windows are typical ranges from the lab; actual timing varies with shipping and lab volume.

How It Works

  1. Intake conversation. We discuss your history, symptoms, goals, and any prior results you choose to share.
  2. Testing discussion. We suggest only panels likely to change your plan, with pricing discussed up front.
  3. Convenient at-home collection. Every panel we use is collected at home — saliva, dried urine, stool, or breath. We do not perform blood draws or order blood panels.
  4. Results review. A dedicated follow-up to go through each marker together and discuss what it may suggest.
  5. Personalized suggestions. Food-first nutrition, supplement options where appropriate, and lifestyle steps — revisited over time.

Related Areas of Care

Have Questions?

Functional Testing Questions

Functional testing looks beyond standard reference ranges to evaluate how the body's systems are actually performing — including hormones, gut microbiome, adrenal rhythm, and cellular metabolism. The goal is to identify root-cause patterns that contribute to symptoms, rather than only confirming or ruling out disease.

No. Our office does not perform blood draws and does not order blood-based lab panels. Every test we use is non-invasive and collected at home — dried urine, saliva, stool, or breath. If you already have blood work from your primary care provider or specialist, we're glad to review those results with you as part of your intake.

Conventional labs are designed to flag disease. The functional panels we use map the gradient of wellness in between — looking at trends, ratios, and interconnections across systems so we can personalize a plan before things progress.

Depending on your intake we may recommend comprehensive stool/microbiome analysis (GI-MAP), SIBO breath testing, DUTCH dried-urine hormone testing, salivary cortisol/adrenal rhythm testing, and urinary organic acids. All are collected at home without a blood draw.

A conventional hormone panel gives a single-timepoint measurement. The DUTCH test uses dried urine collected across a full day to measure not only sex and adrenal hormones but also how your body is metabolizing them — showing pathway preferences, cortisol rhythm, and downstream metabolites that a single-timepoint panel cannot capture.

GI-MAP is a quantitative PCR (DNA-based) stool test that measures specific pathogens, opportunists, commensals, H. pylori and virulence factors, parasites, fungi, and gut-health markers such as calprotectin, secretory IgA, elastase, and zonulin. Standard stool cultures generally only detect a narrow set of pathogens by growth in a lab, missing much of the microbiome picture.

No. Testing is one tool among many. Many patients do well with a thorough intake, food-first nutrition, and lifestyle medicine. We recommend testing only when results would meaningfully change the plan.

We are an out-of-network practice and do not accept insurance, so specialty panels are paid out-of-pocket. We're transparent about pricing before any test is ordered, and we'll always discuss whether a less expensive option could answer the same question.

Most panels return in 2–4 weeks. We review results with you in a dedicated follow-up so you understand what each marker means and exactly what we're going to do about it.

Start With a Clear, Personalized Health Plan

In-office in Riverhead & Huntington, virtually in Garden City, or meet with us virtually from anywhere.

Schedule a Consultation(631) 722-2246