DUTCH Test: Evidence-Based Ways to Improve Your Results

What the DUTCH Test Actually Measures

The DUTCH test is a functional urine-based panel that captures both free (unbound) hormones and their phase-I and phase-II metabolites. Standard serum tests miss most of this picture. A morning cortisol blood draw, for example, reflects total cortisol at one moment; the DUTCH captures the full diurnal cortisol curve plus the total cortisol metabolite load, which shows how much cortisol your body is actually producing and clearing over 24 hours.

Core Hormone Groups on the Panel

Cortisol and the HPA axis. The panel reports free cortisol at four time points (waking, +30 min, afternoon, evening/midnight) plus total metabolized cortisol (aTHF + THF + THE). This lets clinicians distinguish low production from accelerated clearance, two patterns that look identical on a single morning draw.

DHEA and its sulfate. DHEA-S is an adrenal androgen precursor. The Endocrine Society's 2014 androgen-therapy guidelines note that DHEA-S declines roughly 2% per year after age 30, reaching approximately 20 to 30% of peak values by the seventh decade (1).

Estrogen metabolites and the 2-OH:16-OH ratio. The DUTCH reports estrone (E1), estradiol (E2), estriol (E3), 2-hydroxyestrone (2-OHE1), 4-hydroxyestrone (4-OHE1), and 16-alpha-hydroxyestrone (16-OHE1). Research published in Cancer Epidemiology, Biomarkers and Prevention (N=10,786 postmenopausal women) found that higher urinary 2-OHE1 relative to 16-OHE1 was associated with lower breast cancer risk, though the authors stated the ratio is not yet validated as a standalone clinical screening tool (2).

Androgens. Testosterone, androsterone, etiocholanolone, and DHEA metabolites give a fuller picture of androgenic activity than serum total testosterone alone, particularly relevant for women with PCOS or men on TRT.

Melatonin (MT6s). Some DUTCH panels include 6-sulfatoxymelatonin, the primary melatonin urinary metabolite, as a marker of circadian rhythm quality.

What the DUTCH Test Does Not Replace

The DUTCH test does not measure thyroid hormones, insulin, inflammatory markers, or complete blood count. It also cannot diagnose primary adrenal insufficiency (Addison disease), which requires an ACTH stimulation test per the Endocrine Society's 2016 Primary Adrenal Insufficiency guidelines (3).

Understanding Normal DUTCH Test Ranges

"Normal" on the DUTCH is always relative to age, sex, and menstrual cycle phase. Precision Analytical (the manufacturer) provides percentile reference ranges built from a reference population; values are flagged when they fall outside the 5th, 95th percentile for the matched group. Because these are proprietary population ranges rather than consensus clinical cutoffs, the Endocrine Society and AACE do not publish DUTCH-specific reference intervals.

Cortisol Patterns

A healthy cortisol awakening response (CAR) shows a 50 to 160% rise from the waking sample to the +30-minute sample. A meta-analysis of 113 studies (N<33,000 participants) published in Psychoneuroendocrinology found that flattened CAR is associated with burnout, depression, and shift-work disruption (4). Total metabolized cortisol (the sum of all cortisol metabolite fractions) roughly reflects daily cortisol production; values consistently below the 10th percentile for age and sex suggest either low HPA output or very rapid peripheral clearance.

DHEA-S Ranges

DHEA-S peaks between ages 20 and 30 (typically 280 to 640 mcg/dL in men; 65 to 380 mcg/dL in women by serum reference) and declines steadily. The DUTCH reports DHEA-S as a urine metabolite fraction; interpret it in tandem with a serum DHEA-S if absolute replacement dosing is being considered, because urine metabolites reflect clearance, not necessarily circulating levels.

Estrogen Metabolite Ratios

The 2-OHE1:16-OHE1 ratio is frequently cited in functional medicine as a target marker. Most functional practitioners aim for a ratio above 1.0 to 2.0, though this threshold is based on observational epidemiology rather than a randomized trial demonstrating clinical benefit from ratio manipulation (2).

Evidence-Based Ways to Improve Cortisol Patterns

Abnormal cortisol on the DUTCH falls into two broad categories: high-output patterns (elevated free cortisol, blunted diurnal decline) and low-output or flat patterns (low CAR, low total metabolized cortisol). Interventions differ substantially between them.

Fixing a High or Dysregulated Cortisol Pattern

Sleep. Sleep is the single most evidence-supported lever for cortisol regulation. A randomized crossover trial published in JAMA Internal Medicine (N=117) found that extending sleep duration in habitually short sleepers reduced 24-hour urinary cortisol by a statistically significant margin over 12 months (5). Target 7 to 9 hours of total sleep time per the American Academy of Sleep Medicine.

Stress-reduction practices. Mindfulness-based stress reduction (MBSR) over 8 weeks reduced morning salivary cortisol in a meta-analysis of 30 RCTs (N=1,993) published in Health Psychology Review (6). The mean standardized effect size was 0.56 (moderate). Cognitive behavioral therapy (CBT) showed comparable effects in occupational burnout populations.

High-intensity exercise timing. Vigorous exercise acutely spikes cortisol. Training within 2 hours of bedtime consistently delays sleep onset in studies reviewed in a 2019 Sports Medicine meta-analysis, which may perpetuate high nocturnal cortisol (7). Shifting hard workouts to morning hours benefits people with elevated evening cortisol on the DUTCH.

Phosphatidylserine. A double-blind RCT of 400 mg/day phosphatidylserine for 6 weeks (N=80) published in Journal of the International Society of Sports Nutrition showed a 30% blunting of exercise-induced cortisol rise relative to placebo (8). This effect is modest and does not normalize severely elevated cortisol from pathological sources (e.g., Cushing syndrome).

Raising a Low or Flat Cortisol Pattern

Low total metabolized cortisol alongside a blunted CAR most often reflects HPA suppression from chronic stress, prior glucocorticoid use, or, less commonly, early adrenal insufficiency.

Reduce exogenous glucocorticoid exposure. Any topical, inhaled, or oral steroid can suppress the HPA axis. A 2019 systematic review in Annals of the Rheumatic Diseases confirmed that even inhaled fluticasone at doses above 500 mcg/day suppresses morning cortisol in a dose-dependent fashion (9).

Adaptogens with clinical data. Ashwagandha (Withania somnifera) root extract at 300 mg twice daily for 60 days reduced serum cortisol by 27.9% vs. 7.9% placebo in a double-blind RCT (N=64) published in the Indian Journal of Psychological Medicine (10). Rhodiola rosea SHR-5 extract at 576 mg/day for 28 days improved burnout-related fatigue scores in an open-label trial (N=118) (11). Neither adaptogen has been validated specifically against DUTCH cortisol metabolite output; extrapolation from serum or salivary data is reasonable but indirect.

Circadian light anchoring. Morning bright-light exposure (2,500 lux for 30 minutes within 30 minutes of waking) robustly amplifies the CAR. A controlled study in Psychoneuroendocrinology (N=30) documented a 24% increase in CAR area-under-the-curve with morning light vs. Dim-light control (12). Light boxes delivering 10,000 lux compress that required exposure time to approximately 20 to 30 minutes.

Evidence-Based Ways to Improve DHEA-S

Low DHEA-S is common after age 40 and particularly prevalent in people with chronic illness, adrenal insufficiency, and long-term corticosteroid use. The Endocrine Society's 2014 androgen-therapy guideline explicitly states: "We recommend against making a general diagnosis of androgen deficiency in women solely based on low DHEA or DHEA-S levels," given the absence of a validated lower-normal threshold with proven clinical outcomes (1).

DHEA Supplementation

For patients with confirmed adrenal insufficiency, oral DHEA at 25 to 50 mg/day improved quality-of-life scores and sexual function in a 12-month double-blind RCT (N=39) reported in the New England Journal of Medicine (13). The benefit outside this specific population is less consistent.

For perimenopausal women without adrenal insufficiency, a Cochrane review of DHEA supplementation trials found insufficient evidence to recommend routine use (14). DHEA is available over the counter in the U.S. And as a prescription vaginal insert (prasterone/Intrarosa, FDA-approved for dyspareunia) (15).

Lifestyle Inputs That Support DHEA

Regular resistance training modestly preserves DHEA-S with aging. A 12-week progressive resistance program (3 sessions/week) in men aged 50 to 65 raised serum DHEA-S by 9.3% in a small RCT (N=28) published in the European Journal of Applied Physiology (16). Adequate sleep, caloric sufficiency (DHEA-S drops sharply with caloric restriction exceeding 25% of maintenance), and reduction of chronic psychological stress all support adrenal androgen output.

Evidence-Based Ways to Improve Estrogen Metabolism (2-OH:16-OH Ratio)

Shifting estrogen metabolism toward 2-hydroxylation is the main actionable estrogen target on the DUTCH. The 16-alpha-hydroxylation pathway produces a more potent estrogenic metabolite; the 2-hydroxylation pathway produces weaker, more easily cleared metabolites.

Indole-3-Carbinol and DIM

Indole-3-carbinol (I3C), found in cruciferous vegetables, converts in stomach acid to diindolylmethane (DIM). A double-blind RCT of I3C 400 mg/day for 4 weeks (N=57 women) published in the Journal of the National Cancer Institute raised the urinary 2-OHE1:16-OHE1 ratio from a mean of 1.14 to 1.64 (P<0.001) (17). Commercial DIM supplements (typical doses 100 to 200 mg/day) are widely used for this purpose, though long-term clinical outcomes data are limited.

Dietary Cruciferous Vegetables

Epidemiological data from the Nurses' Health Study II (N=90,476) showed that women consuming more than 1 serving of cruciferous vegetables per day had significantly higher urinary 2-OHE1 excretion than those consuming fewer than 3 servings per week (18). Cooking method matters: steaming preserves glucosinolate content better than boiling.

Omega-3 Fatty Acids

A 12-week RCT of fish oil at 3.4 g EPA+DHA/day (N=90) published in Cancer Epidemiology, Biomarkers and Prevention found a modest but statistically significant increase in 2-OHE1 relative to 16-OHE1 (19). The mechanism may involve CYP1A1/CYP1B1 enzyme induction.

Body Composition

Adipose tissue is a site of aromatase activity and 16-alpha-hydroxylation. In the Women's Health Initiative Observational Study (N=6,597), obese women had significantly lower 2-OHE1:16-OHE1 ratios than normal-weight women, independent of menopausal status or hormone use (20). A 5 to 10% reduction in body weight through diet and exercise consistently shifts the ratio in the favorable direction.

Evidence-Based Ways to Improve Testosterone Metabolites

On the DUTCH, androsterone and etiocholanolone reflect total androgenic output alongside testosterone. Low values in men typically track with low serum testosterone; high values in women often accompany PCOS.

For Low Androgens (Men)

The American Urological Association's 2018 testosterone-deficiency guideline defines symptomatic hypogonadism as total serum testosterone below 300 ng/dL with associated symptoms, recommending testosterone replacement therapy (TRT) as first-line treatment (21). Testosterone cypionate 100 to 200 mg IM every 1 to 2 weeks, topical testosterone 1 to 1.62% gel, or subcutaneous pellets all raise testosterone and its urine metabolites on follow-up DUTCH panels. The FDA has approved multiple testosterone formulations for male hypogonadism (22).

Zinc sufficiency (RDA: 11 mg/day for men) supports testosterone production. A clinical study in Nutrition (N=40 wrestlers) found that exhaustive exercise-induced testosterone suppression was significantly attenuated by zinc supplementation at 3 mg/kg/day over 4 weeks (23).

For High Androgens (Women with PCOS)

The Endocrine Society's 2013 PCOS guideline recommends combined oral contraceptives (COCs) as first-line therapy for hyperandrogenism, reducing free androgen index by 40 to 60% in most patients (24). Spironolactone 50 to 200 mg/day, an androgen-receptor antagonist, reduces androsterone and etiocholanolone output on the DUTCH in women with PCOS, though DUTCH-specific outcome data come from clinical observation rather than dedicated RCTs.

Inositol (myo-inositol 2g + D-chiro-inositol 50mg twice daily) reduced total testosterone and improved menstrual regularity over 6 months in a meta-analysis of 15 RCTs (N=1,498) published in Gynecological Endocrinology (25).

Melatonin (MT6s): When This Marker Is Low

Low 6-sulfatoxymelatonin on DUTCH panels typically reflects poor sleep timing, excessive evening light exposure, or shift work.

A practical correction sequence for low MT6s:

1. Dim overhead lights and block blue-spectrum light (screens, LEDs) starting 90 minutes before target bedtime.
2. Keep wake time fixed 7 days per week, including weekends, to anchor the circadian pacemaker.
3. If low MT6s persists after 4 weeks of light hygiene, consider low-dose melatonin 0.5 to 1 mg taken 60 to 90 minutes before target sleep onset. The American Academy of Sleep Medicine's 2023 clinical practice guideline on circadian sleep-wake disorders supports this approach for shift-work disorder and delayed sleep-wake phase disorder (26).
4. Retest MT6s on a follow-up DUTCH panel no sooner than 8 weeks after consistent habit change.

The Endocrine Society's position statement on melatonin notes: "Melatonin is a chronobiotic, not a sedative. Timing of administration matters more than dose for circadian entrainment." (27)

How to Interpret a Re-Test DUTCH Panel

Retesting too soon is a common clinical error. Urine metabolite pools reflect weeks of hormone production, not hours. General retest windows:

• Lifestyle-only interventions (sleep, diet, exercise): retest at 12 weeks minimum.
• Supplementation changes (DIM, ashwagandha, zinc): retest at 8 to 12 weeks.
• Prescription hormone therapy (TRT, HRT, COCs): retest at 6 to 8 weeks after dose stabilization.
• Steroid taper completion: retest 8 to 12 weeks after the last dose, since HPA recovery after prolonged glucocorticoid use can take 6 to 12 months per a review in the Journal of Clinical Endocrinology and Metabolism (28).

The FDA does not regulate the DUTCH test as a diagnostic device; it is a laboratory-developed test. Precision Analytical holds CLIA certification, which governs laboratory quality standards (29).

When to Escalate Beyond Lifestyle and Supplementation

Patterns that require physician evaluation rather than self-directed optimization include:

• Free cortisol consistently above the 95th percentile for age and sex (possible Cushing syndrome; 24-hour urine cortisol and late-night salivary cortisol remain the gold-standard screening tests per the Endocrine Society's 2008 Cushing syndrome guideline) (30).
• Free cortisol below the 5th percentile with fatigue, orthostatic hypotension, and salt craving (possible adrenal insufficiency; requires ACTH stimulation test) (3).
• Serum estradiol above 200 pg/mL in a postmenopausal woman on no exogenous estrogen (requires pelvic ultrasound and endometrial assessment).
• Total testosterone above 150 ng/dL in a woman (requires evaluation for ovarian or adrenal androgen-secreting tumor per the Endocrine Society's hyperandrogenism workup protocol).

A board-certified endocrinologist or reproductive endocrinologist should manage any pattern outside the percentile reference range that does not respond to 12 weeks of evidence-based lifestyle intervention.