Overview
Quick answer
If your hair is thinning or coming out in the brush, a blood test can catch a short list of contributors. It cannot name the pattern. Female pattern hair loss is diagnosed on clinical grounds (Chan and Cook, Australian Journal of General Practice, 2018). The useful job of blood is to filter iron deficiency, thyroid disease, and, when the history fits, androgen excess, so the next conversation is better.
Pattern hair loss is common in older Australians. Gan and Sinclair's 2005 Maryborough survey found mid-frontal hair loss in 57% of women and 73.5% of men aged 80 and over. That is an Australian community sample, not a clinic waiting room.
Australian GPs do not have one national hair-loss panel. AJGP 2018 says laboratory testing should be considered in diffuse alopecia, signs of androgen excess, and early-onset female pattern hair loss, then matches the test to the presentation. A normal set is a useful result. It does not promise that hair will return.
Overview
Key takeaways
The pattern is a clinical diagnosis. Blood cannot see a widening part, a Christmas-tree frontal accentuation, or a receding hairline.
Telogen effluvium is abrupt shedding, usually noticed 3 to 4 months after a trigger. Androgenetic alopecia is gradual miniaturisation driven by dihydrotestosterone (DHT). The two can sit together.
AJGP 2018 matches tests to the story: iron studies and a full blood count for rapid diffuse shedding with a low body-mass index; thyroid function and antibodies for temporal thinning and lateral eyebrow loss; an androgen index, prolactin, and DHEA-S when periods are irregular or there is marked hirsutism or severe acne.
Androgen bloods, when they are ordered, are timed to the follicular phase, between the fourth and seventh days of the cycle. Combined oral contraceptives should be stopped eight weeks beforehand (AJGP 2018).
Iron stores can be low while haemoglobin still looks normal. Australian practice uses ferritin under 30 µg/L as depleted in a well adult; the WHO well-population cut-off is under 15 µg/L. Whether replacing iron regrows hair is a mixed, not settled, question.
TSH is the first thyroid test. High-dose biotin, the kind sold for hair and nails, can interfere with the immunoassays many labs use.
Zinc, vitamin D, and antioxidant supplements are widely sold for hair. Australian Prescriber 2025 calls the evidence highly variable. A symptom is a poor reason to start a stack.
Blood cannot show scarring alopecia, tinea capitis, traction, or trichotillomania. Those need a scalp exam, and sometimes a dermatologist, not another tube.
The frame
Why hair loss is a pattern, not a blood diagnosis
People search "hair loss blood tests" because they want a cause they can fix. The honest Australian answer is narrower. Blood is a filter for a few systemic contributors. The pattern itself is read on the scalp.
The diagnosis is on the head, not the form
AJGP 2018 states that female pattern hair loss is diagnosed on clinical grounds. Australian Prescriber 2025 says the same for androgenetic alopecia in both sexes: the distribution, the hair-pull test, and trichoscopy do the naming. A ferritin or TSH result can sit beside that diagnosis. It does not replace it.
Two jobs, easily mixed up
One job is to recognise the pattern: androgenetic alopecia, telogen effluvium, alopecia areata, or something that scars. The other is to look for a blood-testable amplifier. Mixing the jobs produces a shopping list of fifteen markers and a reader who thinks a normal report means nothing is wrong.
Treat the deficiency first, then talk about hair treatment
Australian Prescriber 2025 is plain: iron deficiency and thyroid dysfunction should be treated before starting treatment for pattern hair loss. That is a sequencing point, not a promise that correcting the blood result will restore density.
If the scalp is itchy, painful, or rapidly bare, or if follicular openings look lost, that is a dermatology question. Blood can wait behind that exam.
Patterns
Three common patterns
Most people who type this query have one of three non-scarring pictures, or two of them at once. The mechanism is different in each, which is why a single "hair loss panel" is the wrong frame.
Androgenetic alopecia (pattern hair loss)
The hair cycle has three main phases: anagen (growth), catagen (transition), and telogen (rest). In androgenetic alopecia, anagen shortens and telogen lengthens, so each follicle spends less time making a thick shaft. DHT, made from testosterone by 5-alpha reductase, binds the same androgen receptor as testosterone but with higher affinity and drives miniaturisation of thick terminal hairs into fine vellus hairs (Sinclair, Torkamani and Jones, 2015, cited by Australian Prescriber 2025). The follicular opening is preserved, which is why the process is at least partly reversible. The pattern is genetically regulated. In women it is usually a widening central part with frontal accentuation, the Christmas-tree pattern, and the occiput is spared. In men it is usually bitemporal recession with or without vertex thinning.
Telogen effluvium (abrupt shedding)
On a normal scalp about 95% of hairs are in anagen and about 5% in telogen, and 80 to 100 hairs are lost each day as they finish the rest phase (Australasian College of Dermatologists). Telogen effluvium is a shift: a larger share of follicles enter telogen together. Shedding is usually noticed 3 to 4 months after the trigger, because that is how long telogen lasts. Triggers include childbirth, high fever, surgery, a major illness or psychological shock, crash dieting, stopping the pill, and some medicines. The hair-pull test is often positive. The scalp looks globally thinner, not patterned. Iron deficiency and thyroid disease are listed among the triggers, which is why those blood tests earn their place here.
Alopecia areata and the rest
Alopecia areata is autoimmune attack on the follicle. It presents as well-circumscribed patches, sometimes with exclamation-mark hairs on trichoscopy. Blood does not diagnose it. Scarring alopecias destroy the follicular opening and can become permanent; itch, pain, scale, or lost ostia are the clues. Traction, tinea, and trichotillomania are examination diagnoses. Australian Prescriber 2025 says symptoms such as scalp pain, itch, burning, extensive loss, or rapid loss without a trigger warrant urgent dermatology referral.
Pattern hair loss and telogen effluvium can run together. A woman can have a Christmas-tree part and a delayed shed after a fever. Blood still cannot separate those two. The history and the scalp can.
Australian practice
What Australian GPs order
AJGP 2018 Table 3 is the Australian primary-care map. It does not say "order everything on everyone with hair loss." It says: match the test to the patient in front of you.
Rapid, diffuse shedding and a low body-mass index
Think nutritional deficiency. The recommended tests are iron studies and a full blood count. This is the presentation where ferritin earns its keep, including iron deficiency without anaemia.
Temporal thinning and lateral eyebrow loss
Think thyroid. AJGP 2018 lists thyroid function tests and thyroid antibodies. Temporal thinning as the first symptom also puts telogen effluvium, frontal fibrosing alopecia, traction, and hypothyroidism on the differential, which is why the scalp exam still comes first.
Irregular periods, severe acne, or marked hirsutism
Think hyperandrogenism, including PCOS, ovarian or adrenal sources. The recommended set is an androgen index, prolactin, DHEA-S, and 17-hydroxyprogesterone. Androgen bloods are timed to days 4 to 7 of the cycle, and combined oral contraceptives should have been stopped for eight weeks.
Obesity, hirsutism, irregular periods, and confirmed female pattern hair loss
AJGP 2018 also flags the metabolic cluster: fasting glucose, a fasting lipid profile, and blood pressure. Pattern hair loss can be the visible complaint sitting on top of insulin resistance. That is a door into the metabolic guides, not a reason to turn this page into a diet protocol.
Early-onset female pattern hair loss, or any diffuse alopecia
These are the two other situations AJGP 2018 names as reasons to consider labs at all. Early onset and a diffuse picture are the prompts. A slowly evolving, classic male pattern in a man with a family history often needs no blood test.
There is no single MBS item called "hair loss panel." Each test is funded, or not, on its own indication. A private clinic list that always includes zinc, vitamin D, DHT, and a full hormone stack is a product, not the AJGP table.
Reading your results
How to read a hair-loss workup report
Australian reports use the field names below. Units matter. A number without its unit is not a result you can act on.
Ferritin, µg/L
Stored iron. Read it with CRP or another inflammation marker, because ferritin rises as an acute-phase protein and can hide a real deficiency. Australian practice treats under 30 µg/L as depleted in a well adult.
Haemoglobin, g/L, on the FBE
The oxygen-carrying protein in red cells. It can still be inside the interval when ferritin is already low. That gap is iron deficiency without anaemia.
TSH, mIU/L, then free T4
TSH is the first thyroid test. Free T4 is added when TSH is abnormal, or when pituitary disease is suspected. Antibodies (TPO) look for an autoimmune pattern; they are not a first-line hair test on their own.
Total testosterone, nmol/L, and SHBG, nmol/L
The androgen index uses both. A high free fraction with a low SHBG is a different story from a high total testosterone. Morning collection still matters for testosterone. In cycling women, so does the day of the cycle.
DHEA-S, µmol/L
An adrenal androgen. Markedly high values push the differential toward an adrenal source. Age-specific intervals are wide; use the interval printed on that report.
Zinc, µmol/L, and 25-OH vitamin D, nmol/L
Sometimes added. A low result is worth treating as a deficiency. It is not, on its own, a diagnosis of why the hair is thinning.
Reference intervals are lab-specific. The floor on a Healius report is not a preventative target, and it is not a hair-density target. Hemexa's own ferritin and TSH bands, where they differ from the printed interval, are Hemexa clinical policy. They are covered on the marker guides, not restated here as consensus.
Iron
Iron, with and without anaemia
Iron is the blood test people most often expect to explain hair shedding. The mechanism is plausible. The outcome data are thinner than the clinic blogs imply.
Why iron can matter to a follicle
Hair-matrix cells divide rapidly and need iron for DNA synthesis and for the iron-sulfur clusters inside mitochondrial enzymes. A shortage can, in principle, push follicles into telogen. That biochemistry is settled. Whether a given person's shed is iron-driven is a separate, clinical question.
Deficiency without anaemia is real
Ferritin can be low while haemoglobin on the FBE still looks normal. Australian Prescriber describes that picture as non-anaemic iron deficiency. AJGP 2018 still wants the full blood count beside the iron studies, because anaemia changes the urgency and the search for a source of loss.
Australian 30 versus WHO 15
Australian Prescriber, GESA, and Australian Red Cross Lifeblood use ferritin under 30 µg/L as the working adult threshold. The WHO well-population cut-off is under 15 µg/L, rated low-certainty in the 2020 guideline. A result of 20 is already below the floor most Australian labs print. It is not "normal for hair."
The hair-specific target is not an Australian standard
Some dermatology papers and clinic pages discuss ferritin targets well above 30 µg/L for shedding. That is practice opinion, not a published Australian college threshold, and it is not Hemexa policy. The evidence that iron replacement regrows hair in telogen effluvium, with or without anaemia, is mixed: reviews note a lack of controlled trials showing regrowth (Kakpovbia, Ogbechie-Godec, Shapiro and Lo Sicco, Journal of Drugs in Dermatology, 2021). Treat documented deficiency because deficiency is worth treating. Do not treat a number invented for hair.
Ferritin also rises with inflammation. Read it with CRP. When inflammation is present, the working rule is a higher ferritin floor plus a low transferrin saturation, not the 30 µg/L well-person cut-off.
For thresholds, inflammation, and how to read iron studies on an Australian report, see the ferritin and iron studies guide.
Thyroid
Thyroid
Both an underactive and an overactive thyroid can shed hair. The mechanism is a change in the hair cycle, not a direct attack on the shaft. Thyroid hormone receptors sit in the follicle; when the signal is wrong, more hairs enter telogen and the shaft can thin.
The scalp clue AJGP actually names
Marked temporal thinning and lateral eyebrow loss are the thyroid-related hair findings in the 2018 table. Diffuse shedding can also follow thyroid disease, and it can look like telogen effluvium. A classic male pattern with no other thyroid symptoms is a weak reason to keep repeating TSH.
TSH first, then free T4
That is the Australian order on the thyroid guide and in RCPA guidance. Free T3 adds less as a routine extra. Antibodies (TPO) support an autoimmune pattern when the history or the TSH already points there. TPO is an addon on Hemexa's panel, not a default hair test.
Biotin can fake the result
High-dose biotin, often 5 to 10 mg in hair and nail products, can interfere with streptavidin-biotin immunoassays used for TSH and free thyroid hormones. Australian thyroid guidance, and the Hemexa thyroid page, ask for a 48 to 72 hour pause before the draw if your clinician agrees. Mention the supplement. Do not assume a wild TSH is real until biotin is out of the picture.
Treating confirmed thyroid disease is standard care. Treating a TSH that sits inside the lab interval, in the hope it will thicken hair, is not an Australian first-line move.
For TSH, free T4, free T3, antibodies, and the biotin pause, see the thyroid blood test guide.
Androgens
Androgens and PCOS
Androgens are why pattern hair loss has that name. They are not why every woman with a widening part needs a hormone panel.
DHT miniaturises the follicle. A DHT blood test rarely helps.
Scalp DHT acts locally. Circulating DHT is not the number AJGP 2018 asks GPs to collect, and it is not an active Hemexa baseline marker. The useful blood question, when it is asked at all, is whether there is systemic hyperandrogenism sitting on top of the pattern.
When the androgen set is indicated
Irregular periods, fertility difficulty, severe acne, or marked hirsutism. That is the AJGP row. The tests are an androgen index (total testosterone with SHBG), prolactin, DHEA-S, and 17-hydroxyprogesterone. Hemexa's annual baseline includes total testosterone, calculated free testosterone, SHBG, and DHEA-S. Prolactin is an addon. 17-OH progesterone is not on the panel.
Days 4 to 7, and an eight-week pill washout
AJGP 2018 is specific: androgen levels need to be drawn in the follicular phase, between the fourth and seventh days of the menstrual cycle, and oral contraceptives should be discontinued eight weeks prior. A random mid-cycle testosterone on the pill is a hard result to read. Stopping contraception is a clinical decision, not a page instruction.
PCOS is a metabolic condition that can show up as hair
PCOS can drive hyperandrogenism and female pattern thinning. The metabolic core is insulin resistance, not "ovarian cysts." Fasting insulin, HOMA-IR, and HbA1c answer that part. The dedicated PCOS blood-test guide covers the 2023 diagnostic criteria, when ultrasound is not required, and how to read an Australian androgen printout.
In men, a female-pattern distribution can occasionally point to testosterone deficiency (Jerjen et al., 2021, cited by Australian Prescriber 2025). That is a specialist conversation, not a reason to start testosterone from a hair complaint.
For morning collection, SHBG, and how Australian labs report testosterone, see the testosterone blood test guide. If the history points to PCOS, use the PCOS blood tests guide rather than treating this hub as that article.
Nutrients
Zinc, vitamin D, and biotin
Hair-and-nail shelves are full of zinc, vitamin D, B-vitamins, and biotin. Australian Prescriber 2025, citing Drake et al. (JAMA Dermatology, 2023), says the evidence for these supplements in hair loss is highly variable, they can be expensive, they can be toxic at high doses, and they can interfere with tests.
Zinc
Zinc is on Hemexa's annual baseline. A low serum zinc is worth discussing as a deficiency. The leap from "my hair is thinning" to "I need zinc" is not supported by strong trials. Small case series exist; they are not a protocol.
Vitamin D
25-OH vitamin D is also on the baseline. Deficiency is common in Australia. The link from a low vitamin D to shedding is inconsistent across studies, and Medicare item 66833 does not list hair loss as a funded reason. Treat deficiency on its own terms.
Biotin
Biotin is sold for hair. In someone who is not biotin-deficient, the hair evidence is weak, and the assay interference is real. If you take a high-dose hair supplement, tell the collector and the GP before thyroid or hormone bloods.
Correct a documented deficiency. Do not build a hair stack from a normal report and a frightened search history.
For units and when vitamin D testing is actually indicated, see the vitamin D blood test guide.
Limits
What blood tests cannot show
A clear blood report is not a dead end. It narrows the search to the things blood cannot measure.
The pattern itself
Androgenetic alopecia is a distribution: Christmas-tree frontal accentuation, vertex thinning, bitemporal recession, a spared occiput. No analyte prints that map.
Scarring versus non-scarring
Lost follicular openings, scale, pustules, and pain are trichoscopy and biopsy questions. Waiting on a zinc result while a scarring alopecia burns follicles is the wrong sequence.
Traction, tinea, and trichotillomania
Tight styles, a fungal scalp, and hair pulling are examination diagnoses. Blood will not show them. Tinea in particular needs scrapings, not a hormone panel.
Whether hair will come back
Australian Prescriber 2025 says treatments for pattern hair loss are not curative, take at least six months to judge, and may need to continue long term. A blood test cannot forecast density. Stopping an effective treatment lets the pattern progress again. This page will not publish doses.
If shedding is sudden, painful, or patchy, or if you have a new bald area with scale, see a GP or dermatologist rather than ordering a wider panel from a webpage.
How to order
How Australians get these tests
| Approach | Best for | Typical cost | What it covers |
|---|---|---|---|
| GP-ordered, Medicare-funded tests when the presentation fits | Diffuse shedding, thyroid clues, or a hyperandrogenism history after a scalp exam | Often bulk-billed or low gap when the GP judges the tests clinically indicated | Typically FBE (MBS 65070), TSH (66716), and iron studies (66596). Androgen tests when the gynaecological history fits. |
| GP-ordered add-ons | A history that points to antibodies, prolactin, vitamin D, or a fuller thyroid panel | Vitamin D is item 66833 and does not list hair loss. TPO and prolactin are often private if there is no other indication. | TPO antibodies, prolactin, vitamin D, or free T4/T3 only when the indication fits, not as a default hair bundle |
| Private standalone tests | Preventative or extra markers outside MBS criteria | Iron studies about $62 to $75; TSH about $20 to $50; TSH plus free T4/T3 about $60 to $150; vitamin D about $40 to $80 | Whatever is written on the request. You still need an authorised GP request. |
| Membership platforms (e.g. Hemexa) | Iron studies, thyroid, androgens, zinc, B12, and vitamin D on one annual draw, then a trend | ~$1,199/year (full membership) | Ferritin and iron studies, TSH/free T4/free T3, testosterone, SHBG, DHEA-S, zinc, B12, vitamin D, and a full blood count among 76–80 signature markers |
Pathology in Australia requires an authorised request from a registered medical practitioner. Collection for Hemexa members is through Healius Pathology, with regional brands that differ by state. A request form is not a diagnosis, and a membership is not a substitute for a scalp exam or a GP visit about red flags.
FAQ
Frequently asked questions
- What blood tests should I ask for if my hair is thinning?
- Start with the story, not a list. For rapid diffuse shedding, ask about iron studies and a full blood count. For temporal thinning or eyebrow loss, ask about TSH and, if indicated, free T4 and thyroid antibodies. For irregular periods, severe acne, or marked hirsutism, ask about an androgen index, prolactin, and DHEA-S, timed to days 4 to 7 of the cycle. AJGP 2018 is the map. A default fifteen-test hair panel is not.
- Can my ferritin be low if my haemoglobin is normal?
- Yes. That is iron deficiency without anaemia: stores are down, the red cell count has not fallen yet. Australian practice treats ferritin under 30 µg/L as depleted in a well adult. The WHO well-population cut-off is under 15 µg/L, so a result between the two can be read two ways.
- Will replacing iron or zinc regrow my hair?
- Not as a promise. Treat a documented deficiency because the deficiency is worth treating. Controlled evidence that iron or zinc replacement regrows hair in telogen effluvium is limited. Australian Prescriber 2025 calls the evidence for hair supplements highly variable.
- Should I stop biotin before a blood test?
- If you take a high-dose hair or nail biotin (often 5 to 10 mg), discuss a 48 to 72 hour pause with your clinician. Biotin can interfere with immunoassay thyroid tests and some hormone assays. Mention it on the form even if you do not stop it.
- Do I need a DHT blood test?
- Usually no. Pattern hair loss is driven by local scalp DHT, not by a circulating DHT result that changes the next decision. AJGP 2018 does not list DHT in the primary-care table. Hemexa does not include DHT on the active baseline panel.
- How much do hair-loss blood tests cost in Australia?
- A GP-ordered FBE, TSH, and iron studies set is often bulk-billed or low gap when clinically indicated. Private standalone prices already published on Hemexa marker guides are about $62 to $75 for iron studies, $20 to $50 for TSH, $60 to $150 for a fuller thyroid panel, and $40 to $80 for vitamin D. Memberships that include these markers on a panel of 76–80 signature markers start around AU$1,199 per year.
- Do I need to fast?
- Iron studies are more reliable when you are otherwise well; serum iron is often collected in the morning. TSH does not need fasting. Androgen tests in cycling women are timed to days 4 to 7. If fasting glucose or insulin is on the same form, you fast for the visit, water only.
- What if every blood test is normal?
- That is a common and useful result. The pattern may still be androgenetic alopecia or a resolved telogen effluvium. The next conversation is the scalp, the timeline, medicines, styling, and whether a dermatologist should look. Blood cannot close those questions.
- Does Hemexa test the markers in a hair-loss workup?
- Yes. The annual baseline includes ferritin and iron studies, TSH, free T4, free T3, testosterone, SHBG, DHEA-S, zinc, vitamin B12, vitamin D, and a full blood count, among 76–80 signature markers. TPO antibodies and prolactin are addons. DHT is not on the active baseline. Collection is through Healius Pathology. A membership does not replace a scalp exam or a GP visit for red flags.
How Hemexa fits
How Hemexa can help
Hair loss has many causes. The useful product move is to put the blood-testable amplifiers on one panel, then read them together, while staying honest that the pattern is still a scalp diagnosis.
Iron studies, thyroid, androgens, zinc, and the FBE on one baseline
Hemexa includes ferritin, iron, transferrin, TSAT, TSH, free T4, free T3, total and calculated free testosterone, SHBG, DHEA-S, zinc, vitamin B12, 25-OH vitamin D, and haemoglobin on the annual baseline, part of 76–80 signature markers. That is the hair-relevant set, not a claim that the panel diagnoses thinning.
Metabolic context when the history points to PCOS
Fasting insulin, HOMA-IR, and HbA1c sit on the same membership. They are the metabolic half of a hyperandrogenism story. They do not replace a gynaecological assessment.
Clinical safety review on the results that cannot wait
Hemexa flags ferritin below 15 or above 1000 µg/L, TSH below 0.1 or above 10 mIU/L, and haemoglobin below 90 or above 190 g/L for follow-up with a doctor, rather than leaving those numbers in a PDF.
Collection through Healius Pathology
Healius Pathology is Hemexa's collection partner, with regional brands that differ by state. Results from other Australian labs can be imported after your first baseline. The partner is the network, not one state brand.
Sources
References
Chan, L., & Cook, D. K. (2018). Female pattern hair loss. Australian Journal of General Practice, 47(7), 459-464. View source ↗
Iyengar, L., & Li, J. (2025). Male and female pattern hair loss. Australian Prescriber, 48, 93-97. View source ↗
Gan, D. C. C., & Sinclair, R. D. (2005). Prevalence of male and female pattern hair loss in Maryborough. Journal of Investigative Dermatology Symposium Proceedings, 10(3), 184-189. View source ↗
Australasian College of Dermatologists. Telogen effluvium (A to Z of Skin). View source ↗
Sinclair, R., Torkamani, N., & Jones, L. (2015). Androgenetic alopecia: new insights into the pathogenesis and mechanism of hair loss. F1000Research, 4, 585. View source ↗