Wellbeing George Nutrition · A Plain-English Guide
How cortisol testing works, and what your levels can't tell you.
Cortisol is your body's main stress hormone, and it moves on a daily rhythm: highest shortly after waking, lowest around bedtime. A cortisol test measures how much of it you're producing, and in Australia there are three common ways to do it. A blood test through your GP takes a single reading, usually in the morning, and can be bulk-billed with a referral. A saliva test collects several samples across one day to map your cortisol rhythm from morning to night. A dried-urine test (such as the DUTCH test) maps the rhythm and adds hormone metabolites. Because cortisol rises and falls all day, a single reading and a rhythm map answer different questions. Functional cortisol testing costs from $355, isn't covered by Medicare, and results are most useful when interpreted with a qualified practitioner alongside your symptoms, sleep and history. It is not a medical diagnosis.
Australia-wide · at-home sample collection · online consults
The basics
What cortisol actually does
Cortisol gets called the stress hormone, but on a normal day it's better described as your body's timing and energy hormone. It's meant to peak within about an hour of waking (that surge is part of what gets you out of bed), then step down through the afternoon and reach its lowest point at night so you can sleep.
That daily curve is the part a single number can't see. Two people can have the same 9am reading with completely different days behind it: one with a healthy morning peak that settles by evening, another running flat in the morning and elevated at midnight. This is why the conversation about cortisol is increasingly about rhythm, not just level, and it's the pattern many people recognise in themselves as feeling wired at night but flat in the morning.
Plenty of everyday things move cortisol around: broken sleep, shift work, caffeine, intense training, illness, some medications, and sustained psychological stress. That's also why one-off readings are interpreted cautiously.
Your options
The three ways to test cortisol in Australia
All three are legitimate tools. They just answer different questions, and an honest page should say so.
| Blood test (via your GP) | Saliva test | Dried urine (DUTCH) | |
|---|---|---|---|
| What it samples | One reading, usually morning | Several samples across one day | Four to five samples across one day |
| What it can show | Total cortisol at that moment; used medically to investigate conditions like Cushing's or Addison's | The shape of your daily rhythm: morning peak, evening low | The rhythm plus cortisol metabolites, sex hormones and melatonin markers |
| Cost | Often bulk-billed with a GP referral | From $355, not covered by Medicare | From $520, not covered by Medicare |
| Where it fits | The right first step when a medical condition is the question. Start with your GP | When the question is your day-to-day pattern: energy, stress load, sleep timing | When you want the fuller hormone picture in one collection |
If your GP has recommended cortisol testing for a medical reason, do that first. Functional testing sits alongside medical care, never in place of it.
Is it for you?
When a cortisol rhythm test may be worth considering
Many of the women we work with have already been to their GP, had standard blood tests, and been told everything is within range, yet they still don't feel at their best. That's a frustrating place to be, and it's exactly the situation where an extra layer of information can help.
A cortisol rhythm test may help explore whether your daily pattern lines up with how your energy, sleep and stress actually feel: where your morning peak sits, how your levels step down through the day, and what's happening at night. It won't explain everything on its own; no single test does. The value is in reviewing the pattern alongside your symptoms, sleep, cycle, nutrition and health history with someone qualified to read it in context.
If your symptoms are new, severe or getting worse, please see your GP first. That's not a disclaimer, it's the right order to do things in.
Our tests
The two cortisol rhythm tests we offer
Well Woman Test
A female hormone and adrenal profile, for insight into cycle patterns, mood, energy and stress load. At-home saliva sample collection, reviewed with a practitioner.
from $355
View the Well Woman TestDUTCH Complete Hormone Test
A dried urine hormone test reviewing sex hormones, adrenal hormones and their metabolites, cortisol rhythm, melatonin and selected organic acid markers. At-home collection.
from $520
View the DUTCH CompleteNot sure which fits your situation, or whether either does? That's what the free call is for. Fifteen minutes with Georgie, no strings, and if a test isn't the right next step for you, she'll say so.
The honest bit
An honest word about what testing can and can't tell you
A cortisol test gives you information, not a verdict. It doesn't diagnose a condition and it doesn't treat anything; its job is to show you a pattern worth reviewing with someone qualified to read it in context.
That cuts both ways, and both directions are useful. A pattern that lines up with how you've been feeling gives the conversation somewhere concrete to start. And a normal result is genuinely valuable too: it lets you and your practitioner rule the pattern out and look elsewhere, which is exactly how this is supposed to work.
You may also come across the term "adrenal fatigue". It's worth knowing that it isn't a recognised medical diagnosis. What the research does support is that cortisol rhythms vary between people and can shift with sustained stress, and that the rhythm is worth looking at as a pattern rather than a verdict.
Common questions
Cortisol testing FAQs
How much does a cortisol test cost in Australia?
A cortisol blood test ordered by your GP is often bulk-billed with a referral. Functional cortisol rhythm testing is privately billed: our saliva-based Well Woman Test starts from $355 and the DUTCH Complete dried-urine test from $520. Neither functional test is covered by Medicare.
Is cortisol testing covered by Medicare?
A GP-ordered cortisol blood test can be, when there's a medical reason for it. Functional saliva and urine rhythm tests are not covered by Medicare and are paid for privately.
Can I test my cortisol at home?
Yes. Saliva and dried-urine cortisol tests use at-home collection: samples are taken at set times across one day and posted to the laboratory. Blood tests are collected at a pathology centre.
What's the difference between a blood cortisol test and a saliva test?
A blood test measures total cortisol at a single moment, usually in the morning, and is the standard medical tool for investigating suspected cortisol disorders. A saliva test takes several samples across a day to show the shape of your cortisol rhythm. One gives a snapshot, the other a curve, and they answer different questions.
What is a normal cortisol level?
Reference ranges depend on the time of day, the sample type and the laboratory, which is why a number on its own means little. Cortisol is normally highest shortly after waking and lowest at night. Results are best interpreted with a qualified practitioner or your GP, alongside your symptoms and history.
How do I lower high cortisol?
That's a conversation to have with your GP or practitioner, because it depends on what's driving it. The areas commonly reviewed are sleep regularity, morning light, movement, caffeine timing, meal rhythm and stress load. This is general information only, not personal advice, and sustained or severe symptoms deserve proper medical review.
How long do results take?
Most functional hormone panels are reported within a few weeks of the lab receiving your samples, and we book your results consultation when you order so the review is already in the diary.
Wondering what your rhythm looks like?
Start with a free 15-minute call with Georgie. Bring your questions, and your GP results if you have them, and leave knowing whether cortisol testing makes sense for you, or whether something else is the better next step.
Reviewed by Georgina, Clinical Nutritionist · Reviewed August 2026 · Sources: Healthdirect, MedlinePlus
This page is general educational information only. It is not medical advice and functional testing does not replace care from your GP or specialist.