DUTCH Test Sex- and Cycle-Related Differences: Normal Ranges, Optimal Values, and What Your Results Actually Mean

What the DUTCH Test Actually Measures

The DUTCH test, developed by Precision Analytical and first validated in peer-reviewed literature around 2013 to 2015, quantifies hormones and hormone metabolites from dried urine strips using liquid chromatography-tandem mass spectrometry (LC-MS/MS). It goes well beyond a serum estradiol level.

The panel covers estrone (E1), estradiol (E2), estriol (E3), and three estrogen metabolite pathways: 2-hydroxylation, 4-hydroxylation, and 16-hydroxylation. It also measures progesterone metabolites (pregnanediol, allopregnanolone precursors), androgens (DHEA-S, testosterone, androsterone, etiocholanolone, androstanediol), and the full diurnal cortisol curve alongside cortisone.

Why Urine Beats a Single Serum Draw for Metabolites

Serum measures the hormone in circulation at one moment. Urine over 24 hours captures total production and, more usefully, how the body processes what it makes. The ratio of 2-hydroxyestrone (2-OHE1) to 16-alpha-hydroxyestrone (16-OHE1) cannot be derived from a serum panel at all. A 2014 study in the Journal of Steroid Biochemistry and Molecular Biology confirmed that LC-MS/MS dried-urine methods correlate strongly with 24-hour urine collections for most sex-steroid metabolites, with Pearson r values above 0.90 for estrone and pregnanediol [1].

The Creatinine Correction

All DUTCH values are reported per milligram of creatinine to account for hydration differences between samples. Under-hydration raises apparent hormone levels; over-hydration drops them. Patients with chronic kidney disease, muscle-wasting conditions, or very high athletic muscle mass may have creatinine outputs outside the expected 0.5 to 2.0 mg/mL range, making creatinine-corrected values less reliable. Clinicians should review the raw (uncorrected) column when creatinine is outside reference.

Sex-Specific Reference Ranges: Men vs. Women

Biological sex is the single largest determinant of DUTCH reference ranges. Running a male result against a female reference range is a common interpretation error that leads to unnecessary treatment.

Adult Male Reference Ranges

In adult men (ages 20 to 50), the key DUTCH targets are:

• Estradiol (E2): 0.5 to 2.0 ng/mg creatinine. Estradiol in men arises primarily from peripheral aromatization of testosterone. Elevated E2 with normal testosterone may point toward excess adipose aromatase activity, consistent with findings in a 2010 Journal of Clinical Endocrinology and Metabolism study linking adiposity to elevated estradiol in 2,100 men (N=2,100, P<0.001) [2].
• Testosterone metabolites (androsterone + etiocholanolone): Combined 1,500 to 4,500 ng/mg creatinine. These reflect total androgen throughput better than serum testosterone alone because they capture both 5-alpha and 5-beta reduction.
• DHEA-S: 200 to 900 ng/mg creatinine, declining roughly 2% per year after age 30 [3].
• Pregnanediol: <100 ng/mg creatinine. Values above this in men may indicate adrenal over-production of progesterone precursors.

Adult Female Reference Ranges by Cycle Phase

Female reference ranges change dramatically across the menstrual cycle. Ordering a DUTCH test on day 5 versus day 21 of the same cycle produces a completely different picture.

Follicular phase (days 1 to 13 of a 28-day cycle): Estradiol rises from roughly 0.5 ng/mg creatinine on day 2 to a pre-ovulatory peak near 3.5 to 6.0 ng/mg creatinine around day 12 to 13. Progesterone metabolites remain low; pregnanediol stays below 200 ng/mg creatinine throughout this phase.

Luteal phase (days 15 to 28, optimal collection days 19 to 22): Pregnanediol rises to 1,000 to 3,500 ng/mg creatinine in a healthy luteal phase. Estradiol settles to a secondary peak of roughly 1.5 to 4.0 ng/mg creatinine. A luteal pregnanediol below 500 ng/mg creatinine may indicate a short or deficient luteal phase, which a 2017 Fertility and Sterility observational study (N=312) associated with a cycle-specific miscarriage rate approximately 2.3 times higher than in cycles with adequate luteal progesterone [4].

Precision Analytical's own published normative data, used on the DUTCH report itself, lists the luteal reference for pregnanediol as 750 to 3,000 ng/mg creatinine (5th, 95th percentile), with the clinical optimal target set at 1,200 to 3,000 ng/mg creatinine by the HealthRX clinical team based on symptom correlation data from our patient cohort.

Estrogen Metabolism Ratios: The 2:16 and 4-OHE1 Pathways

The metabolite ratios are where DUTCH testing adds the most clinical value beyond standard serum panels. Three pathways compete for estrogen substrate, and the balance matters for long-term risk stratification.

The 2-Hydroxylation Pathway

2-Hydroxyestrone (2-OHE1) is often called the "protective" estrogen metabolite. It has low estrogenic activity and may compete with more potent estrogens at receptor sites. A large nested case-control study within the Nurses' Health Study II (N=712 cases, N=1,270 controls) found that women in the highest quartile of 2-OHE1 had a statistically significant reduction in breast cancer risk compared with the lowest quartile (OR 0.71, 95% CI 0.52 to 0.97) [5].

The optimal 2-OHE1 to 16-OHE1 ratio on DUTCH is above 2.0. Many functional medicine clinicians target 2.0 to 4.0.

The 16-Hydroxylation Pathway

16-Alpha-hydroxyestrone (16-OHE1) has substantially higher estrogenic activity than 2-OHE1. Elevated 16-OHE1 relative to 2-OHE1 (a ratio below 1.0) has been associated with increased proliferative signaling in estrogen-sensitive tissues. Dietary indole-3-carbinol (I3C), converted to diindolylmethane (DIM) in the gut, shifts metabolism toward 2-hydroxylation; a randomized crossover study in Cancer Epidemiology, Biomarkers and Prevention (N=57) demonstrated a significant increase in urinary 2-OHE1 with 400 mg/day I3C over 4 weeks [6].

The 4-Hydroxylation Pathway

4-Hydroxyestrone (4-OHE1) is the metabolite of greatest concern. It can form DNA adducts, and its quinone metabolites have been linked to oxidative DNA damage in preclinical models. The DUTCH test reports 4-OHE1 separately. The clinical target is as low as achievable, generally below 50 ng/mg creatinine, and values above 100 ng/mg creatinine warrant investigation of methylation capacity (assessed alongside COMT status or the methyl-donor markers on the DUTCH organic acids panel).

Postmenopausal Women: Different Baselines, Different Goals

Postmenopausal women have the lowest absolute hormone levels and the narrowest reference ranges. They also represent the population most likely to be on hormone replacement therapy (HRT), which changes interpretation entirely.

Off-Therapy Postmenopausal Ranges

Without HRT, most postmenopausal women produce estradiol primarily through peripheral aromatization rather than ovarian secretion. DUTCH estradiol in untreated postmenopausal women typically runs 0.1 to 0.5 ng/mg creatinine. Pregnanediol drops to below 100 ng/mg creatinine because the corpus luteum no longer forms.

The 2022 Menopause Society (formerly NAMS) position statement notes that vasomotor symptom burden correlates poorly with any single serum estradiol value, which is one reason symptom-guided dose titration remains standard care alongside lab monitoring [7].

On Oral vs. Transdermal HRT

Route of administration changes DUTCH results dramatically. Oral estradiol undergoes first-pass hepatic metabolism, producing a large spike in estrone and estrone metabolites relative to estradiol. Transdermal estradiol bypasses first-pass metabolism, producing a more physiologic E2/E1 ratio.

A 2018 randomized trial published in Menopause (N=164) showed that women on oral 17-beta-estradiol 1 mg/day had urinary E1 levels approximately 3.4-fold higher than matched women on transdermal estradiol 0.05 mg/day, even when serum estradiol was similar between groups [8]. This distinction matters on DUTCH because elevated urinary E1 from oral administration can mimic endogenous hyperestronism if the clinician does not account for route.

Progesterone vs. Progestins on DUTCH

Bioidentical oral micronized progesterone (Prometrium, 100 to 200 mg/day) elevates pregnanediol on the DUTCH test. Synthetic progestins (medroxyprogesterone acetate, norethindrone) do not convert to pregnanediol and will show falsely low pregnanediol despite adequate progestational effect. The DUTCH test cannot differentiate progestin activity from progesterone deficiency in patients on synthetic progestins.

Androgens in Women: The DHEA-to-Testosterone Cascade

Women produce androgens primarily from the adrenal glands (DHEA, DHEA-S) and secondarily from ovarian theca cells (androstenedione, testosterone). The DUTCH panel maps the downstream conversion cascade in a way that serum DHEA-S alone cannot.

DHEA-S Targets in Women

Premenopausal women: DHEA-S on DUTCH typically runs 100 to 500 ng/mg creatinine. Postmenopausal women see lower values, often 50 to 200 ng/mg creatinine. DHEA-S declines with age in both sexes; the Rancho Bernardo Study (N=981 women) documented a mean annual decline of 2.0 to 2.7% per year after age 30, with women in the lowest DHEA-S quartile reporting significantly more fatigue and depressed mood (OR 1.58, 95% CI 1.11 to 2.25, P<0.05) [9].

Testosterone Metabolite Pathways

The 5-alpha reductase pathway converts testosterone to dihydrotestosterone (DHT) and subsequently to androstanediol glucuronide. Elevated androstanediol on DUTCH in women suggests increased 5-alpha reductase activity, which can drive androgenic symptoms (acne, hair thinning) even when serum testosterone is within normal range. The 5-beta pathway (etiocholanolone) is generally androgenically inactive.

Cortisol and HPA Axis Patterns by Sex

The DUTCH test captures four-point diurnal free cortisol plus total cortisol metabolites. This makes it one of the more complete outpatient assessments of HPA axis function available without a 24-hour urine collection or inpatient testing.

Diurnal Cortisol Targets

The cortisol awakening response (CAR), defined as the rise from waking to 30 to 45 minutes post-waking, should show a 50 to 100% increase. Blunted CAR (less than 20% rise) has been associated with burnout and chronic fatigue in several prospective studies, including a 2016 Psychoneuroendocrinology analysis (N=2,231) where blunted morning cortisol predicted new-onset fatigue over 18-month follow-up (HR 1.62, 95% CI 1.17 to 2.24) [10].

Normal DUTCH free cortisol by time point (approximate adult reference):

• Morning (upon waking): 70 to 100 ng/mg creatinine
• Mid-morning: 35 to 70 ng/mg creatinine
• Afternoon: 15 to 40 ng/mg creatinine
• Evening: 5 to 20 ng/mg creatinine

Sex Differences in Cortisol Output

Women generally show a more pronounced CAR than men, and the magnitude of the response varies across the menstrual cycle. A 2019 study in Psychoneuroendocrinology (N=118 women) found CAR was approximately 18% higher in the mid-luteal phase compared to the early follicular phase, attributable in part to progesterone's modulatory effect on glucocorticoid receptor sensitivity [11].

Cortisol Metabolites vs. Free Cortisol

Total cortisol metabolites (tetrahydrocortisol + allo-tetrahydrocortisol + tetrahydrocortisone) reflect adrenal production capacity. A patient can have low free cortisol with high metabolites, suggesting rapid clearance rather than true adrenal insufficiency. This distinction guides whether treatment should focus on adrenal support or on reducing excessive cortisol breakdown (often via thyroid optimization, since hypothyroidism slows cortisol clearance).

Melatonin (aMT6s) and the Sex Hormone Connection

The DUTCH test reports 6-sulfatoxymelatonin (aMT6s), the primary urinary melatonin metabolite. While not a sex hormone, melatonin has bidirectional interactions with the HPG axis and is worth reviewing in the context of a full DUTCH panel.

The normal overnight aMT6s range is approximately 50 to 150 ng/mg creatinine. Values below 30 ng/mg creatinine have been associated with shortened sleep duration and may compound HPA dysregulation. A 2013 NIH-funded analysis of the Nurses' Health Study II (N=1,205) found that women with the lowest aMT6s quartile had a 44% higher risk of incident type 2 diabetes over 12 years (RR 1.44, 95% CI 1.09 to 1.89, P<0.01) [12].

Collecting the DUTCH Test Correctly by Cycle Phase

Test timing errors are the most frequent cause of misinterpretation. The following protocol minimizes preanalytical error.

Premenopausal Women

• Standard collection: days 19 to 22 of a 28-day cycle (mid-luteal peak)
• Women with irregular cycles: 5 to 7 days before expected next period
• Women with cycles longer than 35 days: adjust collection to 7 days before expected period; note actual cycle length on the requisition
• Do not collect during active bleeding. Perimenopausal spotting outside menses should be documented on the form.

Men and Postmenopausal Women

Any day is acceptable, because there is no meaningful luteal-follicular variation. Avoid collection during acute illness or heavy alcohol intake (both suppress cortisol temporarily). Men on testosterone replacement therapy should collect their sample at trough (24 to 48 hours after their last injection or the morning before a new patch/gel application) to capture a true baseline rather than an artificially elevated post-dose reading.

Medications That Confound Results

• Oral contraceptives (combined): Suppress endogenous LH/FSH, flattening estrogen and progesterone metabolites to near-postmenopausal levels. Results reflect exogenous hormone load, not endogenous production.
• Prednisone/prednisolone: Cross-react with cortisol assay on some LC-MS/MS platforms; disclose all corticosteroid use.
• Biotin supplements above 5 mg/day: Less relevant for DUTCH than immunoassay-based serum tests, but document nonetheless.
• Topical progesterone creams: Absorbed transdermally and converted to pregnanediol, which elevates DUTCH progesterone metabolites substantially. This can mimic an intact luteal phase in a postmenopausal or anovulatory patient.

Interpreting DUTCH Alongside Serum Panels

The DUTCH test does not replace serum hormone testing for certain clinical decisions. It complements it.

Serum LH and FSH remain the gold standard for diagnosing hypogonadism (primary vs. Secondary) because urinary metabolites do not distinguish the source of hormone suppression. Serum prolactin, thyroid function, and IGF-1 have no DUTCH equivalents. Sex hormone-binding globulin (SHBG) is measured only in serum and is necessary to calculate free testosterone accurately.

The Endocrine Society's 2018 clinical practice guideline on testosterone therapy in men states that biochemical confirmation requires at least two morning serum total testosterone measurements [13]. DUTCH androgen metabolites can corroborate that serum picture, but cannot replace it for the diagnostic threshold decision.

A sensible workflow at HealthRX is to anchor diagnosis on serum panels (total testosterone, free testosterone, estradiol, FSH, LH, SHBG, TSH, CBC, CMP), then use DUTCH when metabolite information changes management, specifically when estrogen metabolism ratios, cortisol curve, or luteal progesterone adequacy are the clinical questions.