Hormone tests for irregular, heavy or changing periods
The core female hormone picture, read the way a women's health doctor reads it: several markers together, in the context of where you are in your cycle.
Female hormone panel
The core female hormone picture, in plain English.
Female hormone and thyroid panel
Our best-selling combination in market: the full hormone picture plus a complete thyroid panel.
28-day cycle mapping
Your whole cycle, mapped, rather than one day of it.
Vaginal microbiome test
What is actually living there, so treatment can be targeted rather than guessed.
About this stage
This stage covers cycles that have changed and the hormones behind them. That means FSH and LH from the pituitary, oestradiol, progesterone after ovulation, testosterone with SHBG and the free androgen index, DHEA-S, prolactin and cortisol. Thyroid function can be added, because an under-active thyroid changes cycles as reliably as any ovarian hormone does. If a single snapshot has not explained things, a mapped cycle follows oestradiol and progesterone across a whole month instead of one morning.
The questions here are the ones women get told to live with. Why are my periods suddenly 40 days apart. Why are they so heavy I plan my week around them. Why has my period gone missing for four months when I am not pregnant. What are the signs of a hormone imbalance, and is that even a real thing. Can I have a hormone test while I am on the pill. Will my GP order this, and does the day of my cycle actually matter that much.
Testing fits by narrowing the field. Prolactin can be raised for reasons that quietly stop ovulation. Androgens point one way, thyroid another, and low iron from years of heavy bleeding explains more exhaustion than most people expect. A panel checks those together so you are not chasing one marker at a time across three appointments.
Recurrent discharge, thrush or bacterial vaginosis sits in this stage too. A vaginal microbiome test identifies which organisms are actually present, including lactobacillus species, so your doctor is working from a result rather than an assumption when something keeps coming back.
What it cannot do is hand you a label. There is no blood test for a hormone imbalance, because that phrase is a description rather than a diagnosis. Hormones also move hour to hour and day to day, so timing matters and one number in isolation means very little. Combined hormonal contraception suppresses several of these readings, and your doctor will interpret the panel with that in mind. Self-pay, not Medicare-rebated, and abnormal results are always followed up by a doctor.
Irregular, late or missing periods
Which blood tests a doctor checks first, and in what order.
Female hormone imbalance: symptoms and tests
What the phrase actually means, and which markers get checked.
Oestradiol explained
What the test shows across your cycle and through perimenopause.
Testosterone, SHBG and DHEA-S in women
What the androgen tests show, and why SHBG changes the reading.
The day 3 hormone test: why the day matters
How to count day one, and what to do if cycles are irregular.
On the pill? How contraception affects hormone tests
Marker by marker: what is affected, and what you can still learn.
Choose your test
Pick the panel that matches your question. Each test page lists every marker, the preparation, the cycle timing and the price before you order.
A doctor requests it
Upload a request your own GP or specialist has signed, or answer a short questionnaire and have a KnowLuna women's health doctor review it and request the panel.
Collect and understand
Give your sample at an accredited collection centre near you, or choose a home kit or a nurse visit where the test allows it. Plain-English results land in your account, with a doctor to talk them through.
Common questions
What are the signs of a hormone imbalance?
Commonly reported changes include cycles that shift in length or flow, periods that stop, new acne along the jaw, hair thinning or new facial hair, breast tenderness, low mood or irritability, poor sleep, and fatigue. None of these are specific on their own, which is exactly why several markers are read together rather than one at a time.
Can I have a hormone test while I am on the pill?
Yes, but read it with care. Combined hormonal contraception, and the injection or implant, suppresses FSH, LH and your own oestradiol, so those three mostly reflect the method rather than your ovaries; a hormonal IUD affects them much less. On combined methods testosterone is lower and SHBG higher. Thyroid, prolactin, iron and metabolic markers are still informative. Tell us what you take and the doctor interprets accordingly.
Does the day of my cycle really change the result?
For some markers, a great deal. FSH, LH and oestradiol are read against day two to five. Progesterone only means something about seven days after ovulation. Prolactin, TSH, androgens and iron can be collected any day. Where timing matters we tell you the window and the doctor notes the collection day on your report.
Can a blood test explain heavy periods on its own?
Not by itself, and hormone levels rarely explain heavy bleeding. The usual first steps through your GP are a full blood count and ferritin, thyroid function if indicated, clotting studies if bleeding has been heavy since your teens, and a pelvic ultrasound for structural causes. A hormone panel helps when cycles are also irregular or absent. Your doctor puts it together.
Sources and further reading
- Jean Hailes for Women's Health: periods
- Healthdirect: period problems
- Better Health Channel: menstrual cycle
- Pathology Tests Explained (RCPA): follicle stimulating hormone (FSH)
- Pathology Tests Explained (RCPA): prolactin
General information only, not medical advice. A blood test is one input to a doctor's assessment, not a diagnosis on its own. If your symptoms are severe or sudden, see a doctor promptly. Read our medical disclaimer.
Read it properly.