Hormone Testing: Serum vs. Saliva vs. Urine (DUTCH Test Guide)

Accurate hormone testing is the foundation of any root cause approach to hormonal health. Yet not all tests are equal — serum, saliva, and urine panels each measure different hormone fractions, metabolites, and rhythms. Understanding what each test reveals (and what it misses) is essential for practitioners and patients navigating hormonal imbalance, BHRT optimisation, adrenal dysfunction, and oestrogen metabolism disorders.

Why Hormone Testing Method Matters

Hormones exist in multiple forms in the body — bound to carrier proteins, free and bioavailable, or already metabolised into downstream compounds. Different testing media capture different fractions:

• Serum (blood) — measures total and free hormone levels at a single point in time
• Saliva — measures free (bioavailable) hormone fractions; captures diurnal rhythms when collected at multiple time points
• Urine (DUTCH) — measures hormone metabolites over 24 hours or via dried urine spots; reveals how hormones are being processed and cleared

Serum (Blood) Testing

What It Measures

• Total and free hormone levels: oestradiol (E2), progesterone, testosterone, DHEA-S, cortisol, FSH, LH, SHBG, thyroid panel
• Snapshot at a single point in time
• Standard reference ranges established from large population studies

Strengths

• Gold standard for diagnosing primary endocrine disorders (hypothyroidism, hypogonadism, adrenal insufficiency)
• Widely available and covered by most insurance plans
• Essential for monitoring BHRT/TRT dosing in many protocols
• Best method for measuring peptide hormones (insulin, IGF-1, TSH, LH, FSH)

Limitations

• Does not capture diurnal cortisol rhythm — a single morning cortisol misses afternoon and evening patterns
• Does not reveal hormone metabolites or detoxification pathways
• SHBG levels significantly affect free hormone calculations — high SHBG can mask functional deficiency
• Progesterone levels are highly variable across the menstrual cycle; timing is critical
• Topical hormone absorption (creams, gels) may not reflect accurately in serum

Best Used For

Initial hormonal workup, thyroid and pituitary assessment, monitoring injectable or oral BHRT/TRT, fertility evaluation, and diagnosing primary endocrine pathology.

Saliva Testing

What It Measures

• Free (unbound, bioavailable) fractions of oestradiol, progesterone, testosterone, DHEA, and cortisol
• Diurnal cortisol rhythm when collected at 4 time points (morning, noon, afternoon, night)

Strengths

• Captures free hormone fractions — the biologically active portion that enters cells
• Excellent for mapping the cortisol awakening response (CAR) and HPA axis rhythm
• Non-invasive; can be collected at home across the day
• Useful for monitoring topical hormone therapy (creams/gels absorb well into saliva)

Limitations

• Does not measure hormone metabolites or downstream processing
• Reference ranges less standardised than serum
• Contamination risk (food, blood from gum disease) can skew results
• Not suitable for monitoring oral or sublingual hormones

Best Used For

Adrenal rhythm assessment, HPA axis dysfunction, monitoring topical BHRT, and evaluating free hormone bioavailability when SHBG is elevated.

Urine Testing — The DUTCH Test

What Is the DUTCH Test?

DUTCH stands for Dried Urine Test for Comprehensive Hormones, developed by Precision Analytical. It uses dried urine spot collection at multiple time points across a day to measure hormone metabolites via LC-MS/MS (liquid chromatography-mass spectrometry) — the most accurate analytical method available for steroid hormone metabolites.

What It Measures

• Oestrogen metabolites — E1, E2, E3, and critically the 2-OH, 4-OH, and 16-OH oestrogen metabolite pathways
• Progesterone metabolites — pregnanediol, allopregnanolone
• Androgen metabolites — DHEA, androsterone, etiocholanolone, testosterone metabolites
• Cortisol & cortisone — free and metabolised fractions; diurnal pattern across 4–5 time points
• Cortisol awakening response (CAR) — the DUTCH PLUS version
• Organic acids — B12, B6, glutathione markers, dopamine/noradrenaline metabolites (HVA, VMA), melatonin (6-OHMS)
• Oxidative stress marker — 8-OHdG

The Oestrogen Metabolism Pathways — Why This Matters

The DUTCH test's most clinically significant feature is its ability to map oestrogen detoxification:

• 2-OH oestrone (2-OHE1) — the "protective" pathway; anti-proliferative
• 4-OH oestrone (4-OHE1) — the "genotoxic" pathway; associated with DNA damage and breast cancer risk when elevated
• 16-OH oestrone (16-OHE1) — proliferative; associated with oestrogen dominance symptoms and cancer risk when disproportionately elevated
• 2-methoxy oestrone (2-MeOE1) — downstream of 2-OH; requires COMT enzyme and methyl donors (magnesium, B6, B12, folate)

Strengths

• Most comprehensive hormonal picture available in a single test
• Reveals metabolic processing — not just levels
• Captures diurnal cortisol pattern including CAR
• Identifies methylation and Phase II detoxification capacity
• Useful for both pre- and post-menopausal women, and men on TRT
• Non-invasive home collection

Limitations

• Does not measure peptide hormones (TSH, LH, FSH, insulin) — serum still needed for these
• Higher cost; rarely covered by insurance
• Requires practitioner interpretation — complex panel with many data points
• Not ideal for monitoring injectable testosterone (serum preferred)

Best Used For

Oestrogen dominance, PCOS, perimenopause/menopause, adrenal dysfunction, HPA axis assessment, BHRT monitoring (especially topical), breast cancer risk stratification, fatigue, mood disorders, and any case where hormone metabolism (not just levels) is clinically relevant.

Comparison at a Glance

Feature	Serum	Saliva	DUTCH (Urine)
Hormone levels	Total & free	Free only	Metabolites
Cortisol rhythm	Single point	4-point diurnal	4–5 point + CAR
Oestrogen metabolism	No	No	Yes (2/4/16-OH)
Topical BHRT monitoring	Poor	Good	Good
Injectable TRT monitoring	Best	Poor	Adequate
Peptide hormones (TSH, LH)	Yes	No	No
Methylation markers	No	No	Yes
Insurance coverage	Usually yes	Rarely	Rarely
Collection	Clinic	Home	Home

Recommended Testing Combinations

For Initial Hormonal Workup

• Serum: TSH, free T3, free T4, oestradiol, progesterone (day 19–21 of cycle), testosterone (total & free), DHEA-S, SHBG, fasting insulin, IGF-1, LH, FSH, cortisol (AM)
• DUTCH Complete: if oestrogen dominance, adrenal dysfunction, or BHRT is being considered

For BHRT/TRT Monitoring

• Topical oestrogen/progesterone: DUTCH + saliva
• Injectable or oral testosterone: serum (total & free T, haematocrit, PSA in men)
• Comprehensive optimisation: DUTCH PLUS (includes CAR) every 3–6 months

For Adrenal & HPA Axis Assessment

• DUTCH PLUS (captures CAR) or 4-point saliva cortisol
• Serum AM cortisol + ACTH stimulation if primary adrenal insufficiency is suspected

Key Nutrients That Support Hormone Metabolism

DUTCH testing often reveals deficiencies in the cofactors needed for healthy oestrogen detoxification and cortisol clearance:

• DIM (diindolylmethane) — shifts oestrogen metabolism toward the protective 2-OH pathway
• Calcium D-glucarate — inhibits beta-glucuronidase; prevents reabsorption of conjugated oestrogens in the gut
• Magnesium, B6, B12, methylfolate — COMT enzyme cofactors for 2-methylation of oestrogen
• Sulforaphane (broccoli sprout extract) — induces Phase II detoxification enzymes (NRF2 pathway)
• NAC & glutathione — support Phase II conjugation and oxidative stress clearance