Over 250k Biomarkers Tested

Cortisol Awakening Response (CAR) Saliva Test

$187.00 AUD

Tired all day but wired at night? Wondering whether your stress response is working the way it should?

At-home saliva test measuring cortisol at six points across the day, including three in the first hour after waking. Maps the full adrenal rhythm and HPA axis activity. Prepaid return satchel.

Collection Location
Specimen Type

Your at-home test kit and all instructions are posted directly to you (with free shipping). You do not need to visit a collection centre.

Private health tests

How At-Home Testing Works

Get tested from the comfort of your home with our simple three-step process.

1
Order your test kit

Order your test kit

Choose the test that's right for you and receive your kit delivered to your door.

2
Collect your sample

Collect your sample

Follow the simple instructions to collect your sample at home.

3
Get your results

Get your results

Receive your results online and get personalised health insights.

Overview

The Cortisol Awakening Response (CAR) measures your cortisol at six points across a full day, capturing the sharp morning spike that healthy adrenal function relies on, plus the gradual decline through afternoon and evening.

Cortisol follows a predictable daily curve. It rises steeply in the 30 to 45 minutes after waking (the "awakening response"), peaks mid-morning, then tapers off toward bedtime. When this rhythm shifts, whether the morning spike flattens, the evening drop stalls, or the overall curve compresses, it can show up as fatigue, poor sleep, brain fog, or difficulty recovering from stress.

A standard single-point cortisol blood test only captures one moment. Six saliva samples across the day give a far more complete picture of your adrenal rhythm, which is why practitioners often prefer this format for evaluating stress-related symptoms.

Your results map your personal cortisol curve against the expected pattern, so your practitioner can see where and when any deviations occur.

Symptoms

This test suits you if you're dealing with persistent fatigue (especially difficulty waking or afternoon energy crashes), disrupted sleep, brain fog, anxiety, or mood changes that haven't improved with standard approaches. It's also worth considering if you're under chronic stress, recovering from burnout, or working shift or irregular hours. Practitioners use the six-point cortisol curve alongside clinical assessment to evaluate how your HPA axis is functioning and to inform ongoing management.

Questions

  • A standard blood test measures cortisol at a single point in time. This saliva test captures six samples across an entire day, which maps your full cortisol rhythm including the morning awakening response. The pattern matters as much as the individual levels.
  • Saliva measures free (unbound) cortisol, which reflects the cortisol your body is actually using. Blood tests measure total cortisol, including the portion bound to proteins. Saliva also lets you collect multiple samples at home without repeated blood draws.
  • Yes. All six samples should be collected on the same day to capture a complete picture of your daily cortisol rhythm. Choose a day that's reasonably typical for you, not a particularly stressful or unusual day.
  • A flattened response means your cortisol doesn't rise as sharply as expected in the morning. This pattern is sometimes associated with chronic stress, fatigue, or disrupted sleep, but what it means for you specifically depends on your full clinical picture. Your practitioner can help interpret it.
  • Yes, but let your practitioner know your schedule. Shift work changes your cortisol rhythm, and your results need to be interpreted in the context of when you actually sleep and wake, not a standard 7 am to 10 pm day.
  • Pause adaptogenic supplements (ashwagandha, rhodiola, etc.) for 48 hours before collection day if possible. If you take prescription medication, check with your healthcare provider before making any changes.
  • DHEA-S is a hormone produced by the adrenal glands that works alongside cortisol. Measuring it together with cortisol gives your practitioner a more complete view of adrenal function.
  • The Cortisol Profile measures four points across the day. This CAR test measures six points, including three in the first hour after waking, and also includes DHEA-S. If you want the most detailed picture of your cortisol rhythm, particularly the morning awakening response, the CAR test is the better option.

Dr. Vu Tran
Bloody Good’s Chief Medical Officer

How to prepare

You'll collect six saliva samples across a single day. Here's how to prepare:

Collection times: Samples are taken at waking, 30 minutes after waking, 45 minutes after waking, noon, 4 pm, and 10 pm (or bedtime). Set phone alarms for each one. Timing matters for the morning samples especially.

Morning samples: The first three samples capture your Cortisol Awakening Response. Collect the first sample within 5 minutes of waking, the second exactly 30 minutes later, and the third at the 45-minute mark. Don't eat, drink, or brush your teeth before the third sample is done.

Food and drink: Avoid caffeine, alcohol, and high-sugar foods on collection day. Water is fine between samples. Don't eat in the 30 minutes before each afternoon or evening sample.

Exercise: Skip intense exercise on collection day. Light walking is fine.

Medications: Some medications (especially corticosteroids) can affect cortisol levels. If you take prescription medication, check with your healthcare provider about whether to adjust timing. Don't stop prescribed medication without medical advice.

Supplements: Pause adaptogenic supplements (ashwagandha, rhodiola, etc.) for 48 hours before collection day if possible. Check with your practitioner if you're unsure.

Collection method: Use the salivettes (cotton swabs) provided in your kit. Place the swab under your tongue for 2 to 3 minutes until saturated. Return the swab to its tube, label it with the collection time, and store in the fridge until all six are done.

Returning your kit: Pack all six tubes in the prepaid return satchel and post on the same day or next business day. Don't leave samples in a hot car or letterbox.

After the test

Share your results with a qualified healthcare practitioner, ideally one experienced in adrenal health or functional medicine. They can interpret your cortisol curve alongside your symptoms and health history, and help you decide whether any changes to your routine, further testing, or practitioner-guided support would be useful.

Many people retest every 3 to 6 months to track how their cortisol pattern responds to any changes they've made.

Your test results will be available in your private dashboard. If there are any urgent issues, we'll let you know so you can follow up with your health professional.

Understanding results

Your report plots your cortisol levels at each of the six collection times against the expected daily curve. You'll see whether your morning spike, midday levels, and evening decline fall within typical ranges, and where they deviate.

Common patterns practitioners look for include a flattened morning response (where cortisol doesn't rise as sharply as expected after waking), elevated evening levels (which may suggest the body isn't winding down on schedule), and an overall compressed or inverted curve.

These patterns can provide useful context, but they don't tell the full story on their own. A qualified healthcare practitioner can interpret your specific cortisol curve alongside your symptoms, health history, and lifestyle to build a clearer picture of what's going on.

Testimonials

What Our Customers Say

4.9
Average Rating
5,500+ Customers Tested
250,000+ Individual Biomarkers
A
Adam O. ACT

Simple health checks in my control

I didn't know that private blood tests were an option. Tried this platform as the packages suited what I wanted for a good price. Easy to follow instructions, and super quick results. Platform provides more information than my gp's ever have on the tests and what the results meant. Would like more clinics to be able to test at (specifically Capital Pathology) but there is a decent network. Will continue to use.

The Performance Check
C
Christopher N. NSW

Quick access to blood tests

BLOODY GOOD is a very efficient route to access blood testing for a visitor outside the Australian health system. It is quick with the necessary referral and documentation, and quick with results. Thank you

Full Blood Count (FBC) Blood Test
R
Rebecca Y NSW

Great Service!

Fantastic service to deal with, I love the extra explanations for all the tests.

Glycated Haemoglobin (HbA1c)
O
Olga B. New South Wales

Convenient

Getting a referral was easy. Laverty pathology accepted it. Bloody Good offers an affordable and convenient way to check essential blood markers.

hs-CRP Blood Test
M
Marita S. Queensland

Bloody good test

Very comprehensive tests that have given me a good picture of my overall health.

The Bloody Good Test
W
Wayne S. NSW

Bloody Good

This is a great service, very helpful support, cheaper than going to the doctor for a blood test

Vitamin D (25-OH)
L
Lukas C. NSW

Quick, easy, hassle free

Excellent service, quick, easy, hassle free, can recommend.

Testosterone Free/Total + SHBG
A
ABDUL S. QLD

Amazingly quick and efficient

Very easy to use. Love that it stores your blood tests.

The Performance Test
A
Andre D. QLD

5 Stars

Efficient and easy to use

Prostate-Specific Antigen (PSA)
W
Wayne NSW

5 Stars

Extremely helpful company

Calcium Blood Test