Why are urine hormone metabolites measured instead of serum levels?

Urinary GCMS measures integrated steroid production and metabolism over hours, capturing conjugated metabolites and hydroxylation pathways that serum snapshots miss. This approach reveals how hormones are partitioned and eliminated, which functional practitioners use to guide lifestyle and supplement interventions.

What is the clinical significance of oestrogen metabolite ratios?

Higher 2-hydroxyoestrone to 16α-hydroxyoestrone ratios are hypothesised to be favourable for breast health, based on observational data. However, metabolite ratios are not standardised, lack robust validation, and should be interpreted as exploratory markers rather than diagnostic endpoints.

Is fasting required for this panel?

No. The dried blood spot thyroid markers do not require fasting, and the timed urine collections are performed throughout the day according to the kit instructions, independent of meals.

How should patients time the urine collections?

The kit specifies four collection times — typically morning upon waking, midday, evening, and bedtime — to map diurnal cortisol rhythm. Patients must record the exact time of each collection and document menstrual cycle day for accurate interpretation of sex hormones.

Can this panel be used for patients on hormone-replacement therapy?

Yes, but exogenous hormones (thyroid medication, oestrogen, progesterone, testosterone, DHEA) directly alter measured analytes and metabolites. Results must be interpreted in the context of therapy, and the panel helps guide dose adjustments and assess metabolite balance.

Does biotin supplementation affect the results?

High-dose biotin (above 5 mg per day) can interfere with some thyroid immunoassays, including TSH and free T₄. Patients should discontinue biotin 48–72 hours before collecting the dried blood spot to avoid spurious results.

How long do results take?

Typical turnaround is seven to fourteen business days from receipt at ZRT Laboratory, as GCMS and LCMS analysis of dried specimens requires more processing time than routine serum immunoassays.

BML-THY-033thyroid endocrineUSA

Blood Spot Thyroids + Dried Urine GCMS Hormone Metabolites and LCMS Diurnal Hormones I

Q: What does a flattened diurnal cortisol curve indicate?

Loss of the normal morning peak and evening nadir — a flattened curve — is associated with chronic stress, burnout, and hypothalamic–pituitary–adrenal axis dysregulation. It is a functional finding rather than a formal diagnosis and guides stress-management and lifestyle interventions.

This panel combines dried blood spot measurement of TSH, free T₄, free T₃, and thyroid antibodies with gas chromatography–mass spectrometry quantification of urinary sex-steroid metabolites and liquid chromatography–mass spectrometry diurnal cortisol and cortisone, offering an integrated functional assessment of thyroid axis, ovarian/adrenal steroid production, oestrogen metabolism, and…

Biomarkers

Dried blood spot

Sample

7–14 business days

Turnaround

Fasting

What is the Thyroid + Dried Urine Hormone Panel test?

This multi-matrix panel combines dried blood spot thyroid markers with gas chromatography–mass spectrometry quantification of urinary sex-steroid metabolites and liquid chromatography–mass spectrometry measurement of diurnal cortisol and cortisone. It is designed for practitioners seeking an integrated view of thyroid function, ovarian and adrenal steroid production, metabolic partitioning of oestrogen, and diurnal adrenal rhythm in a single convenient order, typically within functional or integrative practice frameworks. The dried blood spot component captures TSH, free T₄, free T₃, and thyroid antibodies at a single time point, offering a thyroid axis snapshot comparable to venous serum panels. The dried urine collections profile sex hormones and their phase-I metabolites over the collection window, revealing patterns of production, conjugation, and elimination that single serum draws may miss. Diurnal cortisol and cortisone, sampled at four time points, map circadian rhythm and local cortisol:cortisone balance. Together, the panel suits complex hormone cases where thyroid autoimmunity, oestrogen metabolism, luteal adequacy, androgen balance, and adrenal rhythm are all clinically relevant — for instance, perimenopausal women with fatigue, mood changes, and known or suspected Hashimoto's thyroiditis, or patients with suspected oestrogen-dominance patterns and concurrent subclinical hypothyroidism.

What does the Thyroid + Dried Urine Hormone Panel test measure?

TSH(Thyroid Stimulating Hormone (Dried Blood Spot))

Range: Approximately 0.5–4.5 mIU/L; assay- and method-specific.Optimal: Functional practitioners often target TSH between 1.0 and 2.5 mIU/L, though evidence for narrower therapeutic ranges is debated.mIU/L

Thyrotropin is a glycoprotein synthesised by anterior pituitary thyrotrophs under negative feedback from circulating free T₄ and T₃. It drives thyroid hormone synthesis and release, and its concentration is the most sensitive first-line indicator of thyroid axis dysfunction. Dried blood spot measurement captures TSH at the time of finger-prick collection; correlation with venous serum TSH is well established, though reference intervals may differ slightly by platform.

Elevated TSH with low or low-normal free thyroid hormones indicates primary hypothyroidism; suppressed TSH with elevated free hormones indicates hyperthyroidism or exogenous over-replacement. When interpreted with thyroid antibodies and free hormone levels, TSH anchors the diagnosis and guides therapy titration.

Free T₄(Free Thyroxine (Dried Blood Spot))

Range: Platform-dependent; typical serum ranges ~0.8–1.8 ng/dL.Optimal: Mid-reference-range free T₄ is often targeted in replacement therapy, though individual symptom response varies.ng/dL / pmol/L

Thyroxine is the principal secretory product of the thyroid gland; approximately 0.03% circulates unbound and hormonally active. Dried blood spot free T₄ measurement by immunoassay correlates with direct serum free T₄, though matrix effects and haematocrit may introduce small biases.

Free T₄ distinguishes primary hypothyroidism (low T₄, high TSH) from central hypothyroidism (low T₄, low or inappropriately normal TSH), and helps confirm hyperthyroidism. It is essential for monitoring levothyroxine replacement and for detecting over- or under-treatment.

Free T₃(Free Triiodothyronine (Dried Blood Spot))

Range: Platform-dependent; typical serum ranges ~2.3–4.2 pg/mL.Optimal: Functional ranges vary; some practitioners target mid-to-upper reference values, though clinical response and reverse T₃ context inform interpretation.pg/mL / pmol/L

Triiodothyronine is the biologically active thyroid hormone, 80% of which arises from peripheral deiodination of T₄. Free T₃ represents the tiny unbound fraction available to tissue receptors. Dried blood spot sampling captures circulating free T₃ at collection, though assay performance and reference intervals are method-specific.

Free T₃ is disproportionately elevated in some hyperthyroid states (especially Graves' disease and toxic nodular goitre), identifies T₃ thyrotoxicosis when T₄ is normal, and aids assessment of peripheral conversion in patients on levothyroxine monotherapy who report persistent symptoms.

TPO Ab(Thyroid Peroxidase Antibodies (Dried Blood Spot))

Range: Negative is typically <35 IU/mL; assay-dependent.Optimal: Negative; trends may inform disease activity, though titre does not correlate tightly with severity.IU/mL

Autoantibodies against thyroid peroxidase, the enzyme catalysing thyroid hormone synthesis, are the hallmark of autoimmune thyroid disease. Dried blood spot antibody measurement correlates well with serum titres and provides equivalent clinical information.

Positive TPO antibodies confirm Hashimoto's thyroiditis when TSH is elevated or rising, predict progression to overt hypothyroidism in subclinical disease, and identify immune-mediated risk in pregnancy. They are also found in a minority of patients with Graves' disease.

Tg Ab(Thyroglobulin Antibodies (Dried Blood Spot))

Range: Negative is typically <40 IU/mL; assay-dependent.Optimal: Negative; trends matter in cancer surveillance.IU/mL

Autoantibodies against thyroglobulin, the storage protein within thyroid follicles, often co-occur with TPO antibodies in autoimmune thyroid disease. Their presence can interfere with thyroglobulin measurements used in thyroid cancer surveillance.

Positive Tg antibodies support autoimmune thyroid disease, predict progression to hypothyroidism, and flag potential analytical interference in post-thyroidectomy thyroglobulin monitoring.

E₂(Oestradiol (Dried Urine, GCMS))

Range: Method- and sex-specific; varies widely across menstrual phase and menopausal status.Optimal: Functional reference ranges vary by age, menstrual status, and method; interpretation requires clinical context.ng/mg creatinine / pmol/mg creatinine

Gas chromatography–mass spectrometry measures urinary oestradiol and its conjugated metabolites, reflecting integrated production over the collection period. Results are normalised to creatinine to account for urine concentration.

Urinary oestradiol profiles help assess ovarian function, oestrogen exposure, and the balance between parent hormone and downstream metabolites. Integrated measurement may reveal patterns missed by single serum snapshots.

P₄(Progesterone (Dried Urine, GCMS))

Range: Method- and phase-specific; luteal values far exceed follicular.Optimal: Functional thresholds for luteal sufficiency differ by laboratory and method.ng/mg creatinine / µg/mg creatinine

GCMS measures urinary progesterone metabolites (predominantly pregnanediol-3-glucuronide), which integrate corpus luteum output over hours. Creatinine normalisation adjusts for hydration.

Dried urine progesterone reflects luteal adequacy, helps confirm ovulation, and assesses progesterone therapy absorption and metabolism in a way that avoids the venous-draw timing challenges of serum measurement.

T(Testosterone (Dried Urine, GCMS))

Range: Sex- and method-specific.Optimal: Functional ranges vary by sex, age, and clinical context.ng/mg creatinine

Urinary testosterone and its glucuronide conjugates, measured by GCMS, reflect integrated androgen production. Normalisation to creatinine accounts for urine concentration.

Urinary testosterone profiles aid diagnosis of androgen excess (PCOS, adrenal hyperplasia) and deficiency (hypogonadism), and inform the balance between testosterone and its metabolites including DHT and oestrogen.

Cortisol(Cortisol (Dried Urine, Diurnal Series, LCMS))

Range: Time-of-day-dependent; morning highest, midnight lowest.Optimal: Healthy rhythm shows morning peak declining to night nadir; functional ranges are method-specific.ng/mg creatinine

Liquid chromatography–mass spectrometry quantifies free cortisol in dried urine across multiple timed collections (typically morning, afternoon, evening, night), mapping the diurnal rhythm. This method avoids cross-reactivity with cortisone and synthetic steroids.

Diurnal cortisol profiles detect loss of rhythm (flattened or inverted curves in chronic stress or Cushing's), identify nocturnal elevations, and guide functional adrenal-support interventions. Patterns matter more than single values.

Cortisone(Cortisone (Dried Urine, Diurnal Series, LCMS))

Range: Time-of-day-dependent; tracks cortisol rhythm.Optimal: Functional interpretation centres on the ratio and diurnal rhythm rather than absolute values.ng/mg creatinine

Cortisone, the inactive 11-keto metabolite of cortisol, is measured alongside cortisol by LCMS. The cortisol:cortisone ratio reflects 11β-hydroxysteroid dehydrogenase activity, which regulates tissue glucocorticoid exposure.

Altered cortisol:cortisone ratios may indicate dysregulated local cortisol metabolism, relevant in metabolic syndrome and chronic inflammation. Diurnal cortisone patterns complement cortisol interpretation.

DHEA(Dehydroepiandrosterone (Dried Urine, GCMS))

Range: Age- and sex-dependent; declines with age.Optimal: Functional practitioners often target mid-to-upper reference ranges, though evidence is limited.ng/mg creatinine

DHEA is the principal androgen precursor secreted by the adrenal zona reticularis. Urinary GCMS measurement integrates adrenal androgen output over the collection window.

DHEA levels help assess adrenal androgen reserve, support diagnosis of adrenal insufficiency or hyperandrogenism, and inform supplementation decisions in functional medicine. The DHEA:cortisol ratio is often used as a marker of anabolic–catabolic balance.

E₂ metabolites(Oestrogen Metabolite Ratios (2-OH, 4-OH, 16-OH pathways))

Range: Method-specific; 2-OH:16-OH ratios often reported.Optimal: Functional targets (e.g., 2-OH:16-OH >2.0) are not consensus-based and should be interpreted as exploratory.Ratio

Oestradiol is metabolised via hydroxylation at the 2, 4, and 16 positions, generating metabolites with differing biological activity. GCMS quantifies each pathway, and ratios (especially 2-hydroxyoestrone:16α-hydroxyoestrone) are calculated as markers of metabolic favourability.

Higher 2-OH:16-OH ratios are hypothesised to correlate with lower breast cancer risk, though evidence is observational and contested. Metabolite profiling is used in functional and integrative practices to guide lifestyle, dietary, and supplement interventions aimed at modulating oestrogen metabolism.

Why is the Thyroid + Dried Urine Hormone Panel test ordered?

Perimenopausal or menopausal women with persistent fatigue, mood disturbance, weight gain, or cognitive symptoms in whom thyroid autoimmunity and sex-steroid shifts may co-exist
Patients with known or suspected Hashimoto's thyroiditis who report ongoing symptoms despite TSH normalisation on levothyroxine, where peripheral conversion, adrenal function, and sex-steroid context may inform management
Investigation of suspected oestrogen-dominance patterns — heavy menses, fibrocystic breasts, premenstrual syndrome — alongside thyroid dysfunction and adrenal rhythm disturbances
Functional assessment of patients with polycystic ovary syndrome, where androgen excess, insulin resistance, and thyroid autoimmunity commonly overlap
Monitoring of hormone-replacement regimens (thyroid, oestrogen, progesterone, DHEA) where integrated metabolite and rhythm data guide dose titration and route selection
Chronic fatigue, burnout, or fibromyalgia cases in which thyroid, adrenal, and sex-steroid axes are hypothesised to interact
Patients interested in oestrogen-metabolite profiling for breast-health risk stratification or lifestyle intervention, interpreted cautiously given the exploratory nature of metabolite ratios
Practitioners following functional or integrative protocols that emphasise metabolite balance, diurnal rhythm restoration, and multi-system hormone optimisation

Sample collection and turnaround

Sample type

Dried blood spot, Urine (dried)

Fasting required

Collection method

Finger prick

Turnaround

7–14 business days

Collection notes

Home collection kit. The kit includes lancets and filter-paper cards for dried blood spot (one finger-prick sample for thyroid markers and antibodies) and absorbent strips or cards for four timed dried urine collections (typically morning, noon, evening, bedtime) to capture diurnal cortisol rhythm and sex-steroid metabolite profiles. Patients must follow the timing instructions precisely and document collection times, menstrual cycle day, and any exogenous hormones. Discontinue biotin supplementation 48–72 hours before the blood spot collection. Ensure even saturation of blood spots; avoid touching the collection area. Dried specimens are stable at room temperature for shipping.

Specimen requirements

Dried blood spot: fully saturated filter-paper circles as indicated on the card. Dried urine: absorbent strips or spots collected at the four specified times, with creatinine correction applied during analysis. Document cycle day, time of day for each collection, and all medications and supplements.

What can affect Thyroid + Dried Urine Hormone Panel results?

variableHaematocrit and spot uniformity

Dried blood spot analyte recovery depends on haematocrit and even saturation of the filter card; under-filled or non-uniform spots can yield inaccurate results, particularly for immunoassays.

variableUrine hydration status and collection completeness

Creatinine normalisation adjusts for concentration, but extreme hydration, incomplete collection, or missing time points compromise the accuracy of integrated hormone profiles and diurnal curves.

variableMenstrual cycle timing

Oestradiol, progesterone, and testosterone vary across the menstrual cycle; collection timing (follicular, ovulatory, luteal) must be documented and matched to phase-specific reference ranges, or serial collections performed.

elevatesExogenous hormone therapy

Oral contraceptives, hormone-replacement therapy, thyroid medication, and DHEA supplementation directly alter measured analytes and metabolites; practitioners must document all therapies and interpret results in that context.

variableBiotin supplementation

High-dose biotin (>5 mg/d) can interfere with some immunoassays, including TSH and free thyroid hormones; discontinuation 48–72 hours before collection is recommended.

variableLiver and gut metabolism

Hepatic conjugation, enterohepatic recirculation, and gut microbiome composition influence urinary metabolite profiles; liver disease, gut dysbiosis, or medications affecting phase-II enzymes can shift metabolite ratios independently of production.

What do Thyroid + Dried Urine Hormone Panel results mean?

Elevated

Elevated TSH with low free T₄ or T₃ indicates primary hypothyroidism (often Hashimoto's if antibodies are positive); suppressed TSH with elevated free hormones indicates hyperthyroidism or thyroid-medication over-replacement. Elevated urinary oestradiol or testosterone points to ovarian or adrenal hyperandrogenism (PCOS, adrenal hyperplasia) or exogenous therapy. High cortisol across diurnal points, especially at night, suggests Cushing's syndrome, exogenous glucocorticoid exposure, or chronic stress with rhythm dysregulation. Elevated 16-OH oestrogen metabolites relative to 2-OH metabolites are hypothesised — though not proven — to confer higher oestrogenic activity and breast cancer risk.

Normal

Normal-range results do not exclude subclinical or early-stage dysfunction, particularly when symptoms persist and functional thresholds are narrower than laboratory reference limits. Thyroid antibodies may be positive despite normal TSH, predicting future hypothyroidism. Cortisol rhythm may be normal in total but abnormal in pattern (loss of peak-to-nadir amplitude). Oestrogen metabolite ratios are exploratory and should not be interpreted as diagnostic of health or disease.

Reduced

Low TSH with low free T₄ and T₃ indicates central hypothyroidism; low free T₃ with normal T₄ and TSH may reflect impaired peripheral conversion. Low urinary progesterone in the luteal phase suggests inadequate corpus luteum function or anovulation. Flattened or low diurnal cortisol, especially low morning values, is seen in adrenal insufficiency, chronic fatigue, or hypothalamic–pituitary–adrenal axis dysregulation. Low DHEA reflects declining adrenal reserve with age or adrenal insufficiency. Predominance of 2-OH metabolites is considered favourable in functional frameworks, though clinical endpoints are not established.

Note: Results are method-, platform-, and laboratory-specific; reference ranges for dried blood spot and dried urine analytes differ from venous serum and 24-hour urine norms. Diurnal cortisol interpretation requires all four time points and attention to collection adherence. Oestrogen metabolite ratios are not standardised, lack robust clinical validation, and should be presented as exploratory tools rather than diagnostic endpoints. Thyroid antibody positivity does not predict the pace of progression to overt hypothyroidism, and metabolite 'imbalances' do not mandate intervention. Interpretation must integrate clinical history, cycle timing, exogenous therapies, and the broader hormone context; isolated analyte abnormalities should not drive treatment decisions.

Frequently asked questions

Dried blood spot TSH, free T₄, and free T₃ correlate well with venous serum results and are clinically validated for thyroid monitoring. Reference intervals may differ slightly by platform, so serial results are best compared within the same laboratory.

How to access the Thyroid + Dried Urine Hormone Panel test

The Thyroid + Dried Urine Hormone Panel reference page is free and open to all practitioners. Create a free practitioner account to see pricing, save tests to your list, and generate requisition forms. Verification takes 1–2 business days.

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About this page

Published: October 7, 2026

Last reviewed: October 7, 2026

References:

Jonklaas J, et al. Guidelines for the treatment of hypothyroidism: prepared by the American Thyroid Association task force on thyroid hormone replacement. Thyroid. (2014)
Pearce SHS, et al. 2013 ETA guideline: management of subclinical hypothyroidism. Eur Thyroid J. (2013)
Krasowski MD, et al. Cross-reactivity of steroid hormone immunoassays: clinical significance and two-dimensional molecular similarity prediction. BMC Clin Pathol. (2014)
Handelsman DJ, et al. Mass spectrometry, immunoassay and valid steroid measurements in reproductive medicine and science. Hum Reprod. (2018)
Fourkala E-O, et al. Association of oestrogen metabolism with breast cancer risk in a prospective cohort. (verify year and journal). (2012)
Adam EK, et al. Diurnal cortisol slopes and mental and physical health outcomes: a systematic review and meta-analysis. Psychoneuroendocrinology. (2017)
Russell E, et al. Hair cortisol as a biological marker of chronic stress: current status, future directions and unanswered questions. Psychoneuroendocrinology. (2012)

This content is for licensed healthcare practitioners only and does not constitute medical advice. Clinical decisions should be based on the full clinical picture and not on any single test result.