Hair Testosterone Test
About this test
ELISA — gender-aware reference ranges. Wellness reading.
What this test can show
Hair testosterone reflects longer-term androgen levels accumulated in the hair, giving a stable, retrospective view rather than the moment-to-moment swings seen in blood.
Sample type
Hair — head, proximal 3 cm
Hair testosterone analysis captures approximately three months of cumulative androgen exposure — a longitudinal view of hormone status that single-point serum testing cannot replicate. Particularly informative in women’s hormone presentations, where diurnal and cycle-phase variability complicate interpretation.
Key points
- Months of cumulative exposure, not a single moment. Hair grows ~1 cm/month, capturing roughly three months of integrated free-androgen levels.
- Independent of diurnal and cycle-phase variation. Unlike serum testosterone — which fluctuates with time of day, menstrual-cycle phase and acute stress — hair reflects long-term tissue exposure.
- Particularly informative for women’s hormone presentations — PCOS, hirsutism, androgenic hair loss, persistent acne, menstrual irregularities and fertility evaluation.
- Complementary to Hair Mineral Analysis. The Zn:Cu ratio in HMA influences hormone metabolism — pairing the two provides a fuller endocrine picture.
Why hair, not just serum
Both methods have their place — a clinician investigating an acute presentation may still need a serum draw. But for chronic androgen excess or insufficiency, the analytical signal in serum is often hidden behind biological noise. Hair testosterone smooths the signal across months, exposing trends single-point sampling can miss.
Serum is a snapshot: diurnal variation (up to a 30% swing), cycle-phase variation in women, acute-stress suppression, and SHBG-related interpretation challenges all complicate it. Hair integrates over months: ~1 cm captures ~30 days, a standard 3 cm sample reveals 90 days of trend; it reflects the free (unbound) hormone fraction, bypassing SHBG complexity, and is stable to single-day variability.
Clinical applications
Most clinical use is in the assessment and longitudinal monitoring of androgen-related conditions in women, where the limitations of serum testing are most acute. Practitioners also use it for treatment monitoring in androgen-modulating therapies.
PCOS investigation & monitoring: helps clarify equivocal serum measurements — particularly in lean PCOS phenotypes or where the serum draw missed the elevated window — and monitors response to insulin sensitizers, hormonal therapy or lifestyle intervention.
Hirsutism & androgenic hair loss: these often present with serum testosterone in the upper-normal range — clinically suspicious but lab-equivocal. Hair’s integrated signal can confirm chronic excess where intermittent draws have missed it.
Adrenal androgen disorders: non-classical CAH and adrenal androgen excess can normalize mid-day, confounding morning serum draws; hair captures cumulative steroid exposure across the diurnal cycle.
Fertility & reproductive workup: a useful adjunct in unexplained infertility when androgenic patterns are clinically apparent but serum testosterone is borderline; also informs HRT monitoring in trans-male patients on testosterone.
Methodology
Hair samples are decontaminated to remove surface deposits (sebum, sweat, environmental residues) without disrupting incorporated hormone, then mechanically homogenized to release internalized testosterone for extraction. Quantification is by liquid chromatography coupled with tandem mass spectrometry (LC-MS/MS) — the gold standard for steroid-hormone quantification at physiological concentrations, providing absolute specificity through unique mass signatures and eliminating the cross-reactivity issues common in immunoassays.
CanAlt’s standard analysis uses the proximal 3 cm from the scalp (the most recent ~3 months of growth). Concentrations are influenced by hair growth rate, pigmentation (in some studies), recent chemical treatments and the segment analyzed.
Companion services
Hair Cortisol Analysis: long-term HPA-axis activity from the same hair-sample window — chronic stress can suppress androgens.
Hair Mineral Analysis: the Zn:Cu ratio influences androgen metabolism (zinc is required for testosterone synthesis; copper antagonizes the relationship).
Heavy Metals Hair Analysis: endocrine disruptors — particularly cadmium and lead — interfere with hormone-synthesis pathways.
Regulatory & scope
Performed at CanAlt’s ISO 15189 Plus™ accredited medical laboratory in Mississauga, Ontario, licensed by the Ontario Ministry of Health under the Laboratory and Specimen Collection Centre Licensing Act. Practitioner-ordered — reference ranges are sex- and age-specific and should be interpreted in clinical context with history, symptoms, paired diagnostics and (where indicated) serum measurements. Authorized requisitioners under Ontario Regulation 682 include medical practitioners, nurse practitioners (extended class), midwives and members of the College of Naturopaths of Ontario; out-of-province practitioners are accepted under Reg. 682’s interprovincial provisions.
- Assessment and longitudinal monitoring of androgen-related conditions in women — PCOS, hirsutism, androgenic hair loss, persistent acne, menstrual irregularities and fertility evaluation.
- Treatment monitoring in androgen-modulating therapies (including testosterone replacement and, in male patients, monitoring TRT compliance and dosing trajectory).
How does this differ from a serum testosterone draw?
Serum testosterone is a snapshot — what’s circulating at the moment of the draw, with substantial diurnal, cycle-phase and acute-stress variability. Hair testosterone is integrated — what’s been incorporated into the growing hair shaft over the past three months. Most practitioners use them as complementary tests: serum for the acute window, hair for the chronic trajectory.
How much hair is needed?
Approximately 1 inch from the nape of the neck — about 100 mg (roughly a pencil-width clump), less than HMA requires. For very fine or short hair, multiple smaller samples can be combined.
Can hair testosterone be used in male patients?
Yes, though the use case is narrower. In male patients it’s most useful for monitoring testosterone replacement therapy (longitudinal compliance and dosing trajectory), evaluating suspected androgen abuse, or where serum variability creates interpretive challenges. For routine male hypogonadism workup, serum testosterone with paired SHBG, LH and FSH remains the standard first-line panel.
What about hair treatments — dyes, perms, bleach?
Chemical treatments can alter steroid-hormone concentrations in hair. Collect hair not chemically treated within the previous 4–6 weeks, or note recent treatments on the requisition. Bleaching has the largest effect; dyeing and perming are more variable.
Is hair testosterone affected by topical or oral testosterone therapy?
Yes, predictably — both routes eventually appear in hair as the systemic hormone reaches the growing follicle, which is why hair testosterone is useful for monitoring TRT. Topical application directly to the scalp could contaminate the sample at the collection site; nape-of-neck collection minimizes this.
How often should it be retested?
For monitoring an intervention (medication change, therapy initiation, lifestyle program), re-test 3–6 months after the change so new growth captures the post-intervention period. For ongoing surveillance once stable, annual re-testing is typical.
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