PCOS blood test: what to expect.
A PCOS blood test measures androgens, cycle hormones and metabolic markers in one draw. You fast for eight to twelve hours beforehand, ideally collect early in your cycle and early in the day, and it takes about ten minutes. Results usually come back within a few business days.
If you have been told PCOS might explain your irregular cycles, acne or hair changes, this is usually the next step. Here is a practical walk-through of what happens, how to prepare, what it costs, and what the results can and cannot do.
What is measured, and why
- Testosterone and SHBG, which together give the free androgen index: the blood-test half of "signs of high androgens".
- LH and FSH, where a relatively high LH is a supporting clue.
- Fasting glucose and HbA1c, because insulin resistance sits behind many PCOS symptoms and shifts long-term risk, and these are the glycaemic markers the guideline recommends.
- Lipids, for the heart-health baseline.
- TSH and prolactin, to rule out thyroid and pituitary causes of irregular cycles.
AMH is not part of the standard KnowLuna PCOS panel. In adults a doctor can request it separately, because a high AMH reflects ovaries carrying many small follicles and can stand in for the ultrasound criterion. It is not used that way in teenagers, and the cut-off is specific to the laboratory assay.
Our article on PCOS and your hormones explains what each pattern means once the numbers arrive.
Preparing for collection
- Cycle day. If you have cycles, day 2 to 5 is ideal for LH and FSH. If they are very irregular or absent, collect any time and note when your last period was.
- Time of day. Testosterone peaks in the morning, so an early appointment gives the most interpretable androgen result.
- Contraception. The combined pill lowers androgens and raises SHBG, which can hide exactly the pattern you are testing for. If you are on it, tell your doctor. Our guide to contraception and hormone tests goes marker by marker.
- Medicines and supplements. List everything you take. Some affect insulin, lipid or thyroid readings.
- Water and comfort. Water is allowed and makes the draw easier. Wear a sleeve that rolls up.
On the day
Bring your request (KnowLuna sends yours to your phone) and your ID. The usual route is an accredited NATA collection centre near you, and a home kit or a nurse visit is available if you would rather not attend one. Most centres take walk-ins, and a standard draw is two or three small tubes. Expect about ten minutes in the chair, less if the centre is quiet. You can eat straight afterwards, so bring something with you.
Your results timeline
| When | What happens |
|---|---|
| Day 0 | You collect at the centre. Samples go to the laboratory the same day. |
| 1 to 3 business days | Most hormone and metabolic markers are resulted. Any add-on marker your doctor requests separately can take a little longer. |
| Within about 5 business days | Your plain-English report appears in your KnowLuna account, with every marker explained and anything outside range flagged. |
| After that | Your 20-minute video consult, if you chose the doctor option. Abnormal results are always followed up by a doctor, whichever option you chose. |
Turnaround varies by laboratory and by test; your account shows progress for each marker.
What it costs
Through a GP, PCOS bloods are often rebated by Medicare when there is a clinical reason to investigate, so your main cost is the appointments. Self-pay prices vary by provider and by how many markers are included, which is the number worth comparing rather than the headline price. The KnowLuna PCOS panel is $169 with your own doctor's signed request, or $249 with a KnowLuna doctor who requests the panel and explains the results in a 20-minute video consult. Prices are indicative launch prices in Australian dollars.
What the results can tell you
Whether your androgens are raised, whether your LH and FSH pattern fits, how your blood sugar and lipids are tracking, and whether the metabolic markers suggest your doctor should look further at insulin resistance. Read alongside your symptoms and cycle history, that lets a doctor apply the diagnostic criteria properly.
What they cannot
Confirm PCOS on their own. PCOS needs two of three features: irregular ovulation, high androgens (on bloods or clinically), and polycystic ovaries on ultrasound (or, in adults, a raised AMH in place of the scan), with other causes excluded. Blood tests cover parts of that, and sometimes an ultrasound is still needed. Normal results do not necessarily rule PCOS out either, especially on the pill. The PCOS diagnosis criteria article sets out how a doctor weighs it all up.
Afterwards
Your report explains every marker in plain English, and your doctor talks it through: whether PCOS looks likely, what else might need checking, and what a sensible next step is. PCOS is manageable, and understanding your own pattern is where that starts.
Common questions
Do I need to fast for a PCOS blood test?
Yes, if the panel includes fasting glucose or lipids, and most do. Have nothing but water for 8 to 12 hours, which in practice means an early morning appointment after an ordinary night's sleep. The hormone markers do not need fasting, but there is no harm in collecting them at the same time. Bring breakfast for afterwards.
What day of my cycle should I test for PCOS?
Day 2 to 5, counting from the first day of proper bleeding, gives the cleanest LH and FSH baseline. If your cycles are long, unpredictable or absent, do not wait for a period that may not come: collect any time and tell your doctor when you last bled. The metabolic markers are not cycle dependent, and neither is AMH if your doctor adds it.
How much does a PCOS blood test cost in Australia?
Through a GP the pathology is often rebated by Medicare when there is a clinical reason, so your cost is mainly the appointments. Self-pay prices vary widely with the number of markers included. KnowLuna's PCOS panel is $169 with your own doctor's request or $249 with a KnowLuna doctor's request and results consult.
What blood tests are done for PCOS?
Testosterone and SHBG for the free androgen index, LH and FSH, DHEA-S, fasting glucose and HbA1c, lipids, and TSH with prolactin to exclude other causes of irregular periods. In adults a doctor may also request AMH separately, where it would stand in for an ultrasound. The exact list varies with your symptoms and history.
How long do PCOS blood test results take?
Most markers are resulted within one to three business days of collection, with any separately requested add-on sometimes a little longer. Your KnowLuna report is usually ready within about five business days, and your doctor consult is booked after that. Anything clearly abnormal is followed up by a doctor rather than left in your account.
Sources and further reading
- Monash University: International Evidence-based Guideline for the Assessment and Management of PCOS 2023
- Teede HJ et al. Recommendations from the 2023 International Evidence-based Guideline for the Assessment and Management of PCOS. J Clin Endocrinol Metab 2023
- Pathology Tests Explained (RCPA): testosterone
- Pathology Tests Explained (RCPA): sex hormone binding globulin (SHBG)
- Healthdirect: polycystic ovarian syndrome (PCOS)
- Jean Hailes for Women's Health: polycystic ovary syndrome (PCOS)
General information only, not medical advice. If your symptoms are severe or sudden, see a doctor promptly. This page does not replace a consultation with a doctor who knows your history; read our medical disclaimer.