Test ID: S-120 | Sample Type: Saliva | Technology: LC-MS/MS | Results Time: 3–5 Working Days After Laboratory Receives Sample | Laboratory: ZRT Laboratory – CLIA Certified | Hormone Specialist Doctor Interpretation: Included | Suitable For: Adults and Children
What Does This Test Measure?
Saliva — 4-Point Cortisol Profile (LC-MS/MS): Morning, Midday, Evening and Bedtime Cortisol.
This at-home test measures one hormone—cortisol—at four collection times. Your results show how free cortisol levels change across your collection day, providing more information about your daily pattern than a single morning measurement.
Cortisol participates in the stress response, energy regulation and the sleep–wake cycle. Your practitioner can review the profile alongside your symptoms, sleep schedule, medicines and daily routine.
Related Symptoms
Persistent tiredness; difficulty becoming alert in the morning; afternoon energy dips; feeling tired but unable to relax; difficulty falling asleep or staying asleep; and feeling stressed, tense or overwhelmed.
Did You Know?
Cortisol normally follows a daily rhythm, with higher levels around waking and lower levels towards bedtime. Four timed measurements show whether your sampled levels follow this general pattern.
Evening and bedtime results provide information that a morning sample alone cannot supply. Reviewing the profile alongside a sleep and energy diary helps put the measurements into context.
Who Should Consider This Test?
Women experiencing;
- Persistent tiredness or fluctuating energy
- Difficulty becoming alert after waking
- Afternoon energy dips
- Feeling “tired but wired” in the evening
- Difficulty falling asleep, night waking or waking unrefreshed
- Ongoing stress or difficulty winding down
How Your Results Can Help Guide Your Next Steps
Persistent Tiredness or Difficulty Getting Going
Relevant measurements: Morning cortisol and the overall daily profile
The morning result shows your cortisol level near waking. The later measurements add information about how levels change throughout the day.
How to use your results: Record your sleep duration, waking time and when tiredness occurs. Your practitioner can review these alongside the report, discuss sleep consistency and recovery, and decide whether further investigations—such as thyroid, iron or other tests—would be useful.
Afternoon Energy Dips
Relevant measurements: Midday and evening cortisol
These measurements provide information about cortisol at the times you may notice changes in energy. They help your practitioner assess the laboratory pattern alongside your daily experience.
How to use your results: Note meal times, caffeine intake, activity and energy dips. This supports a practical review of regular meals, hydration, sleep and workload, while helping your practitioner investigate persistent fatigue appropriately.
Feeling Tired but Unable to Relax
Relevant measurements: Evening and bedtime cortisol
These results show whether cortisol is within the laboratory’s expected range later in the day, when levels would generally be lower.
How to use your results: Discuss late caffeine, alcohol, demanding evening exercise, work schedules and bedtime habits. Your practitioner can help you choose manageable changes and determine whether further sleep or health assessment is needed.
Difficulty Falling Asleep or Staying Asleep
Relevant measurements: Bedtime cortisol, interpreted with the full profile
The bedtime measurement adds hormone information to your sleep assessment. The complete profile provides context from the rest of the day.
How to use your results: Bring a sleep diary recording bedtime, night waking and waking time. Your practitioner can discuss a consistent sleep schedule, morning daylight, evening routines and evidence-based insomnia treatment where appropriate.
Feeling Stressed, Tense or Overwhelmed
Relevant measurements: The four-point cortisol profile
The profile shows cortisol levels at four times during one day. It provides biochemical information to review alongside the pressures you are experiencing.
How to use your results: Discuss your workload, exercise, recovery and emotional wellbeing. Together, you can plan practical stress-management steps and suitable support. An unusual result may also prompt further clinical investigation.
How the Laboratory Comments Help
Your report’s numerical results, reference ranges and accompanying laboratory comments help explain the measured pattern. Accurate collection times and details of medicines, supplements and treatments make this interpretation more useful.
Bring the report to your healthcare professional to agree which findings need follow-up, which lifestyle changes are worthwhile and whether further tests or treatment are appropriate.
See All Day Cortisol Sample Report (4 Point Cortisol)
What About PMS, Menopause or Other Hormonal Symptoms?
If tiredness or sleep problems occur alongside PMS, menstrual changes or menopause symptoms, this profile can contribute cortisol information to a broader assessment.
Separate evaluation is needed for reproductive hormones, thyroid function, PCOS or HRT management. This panel measures cortisol rather than progesterone, oestrogen, testosterone or melatonin.
Turn Your Results Into a Practical Plan
Use your report alongside a symptom diary to:
- Identify findings that need further investigation
- Review sleep, caffeine, activity and recovery habits
- Agree appropriate care with your practitioner
- Track improvements in energy, sleep and daily wellbeing
The practical benefit is additional information for a focused assessment—not a fixed diet, supplement or treatment plan based on cortisol numbers alone.
Why This Test Is Particularly Important For Women
- Morning cortisol sets the hormonal tone for the entire day in women — a blunted Cortisol Awakening Response is associated with burnout, fatigue severity, and disrupted cycle regularity; an exaggerated response drives anxiety, heart palpitations, and acute progesterone suppression
- Elevated noon and evening cortisol suppress progesterone synthesis via pregnenolone steal throughout the day — producing oestrogen dominance, worsening PMS, luteal phase defect, and cycle irregularity even when absolute estradiol appears normal
- High evening cortisol prevents the natural progesterone and melatonin rise in early evening — directly impairing sleep onset, sleep quality, and the hormonal restoration that occurs during the first sleep cycles
- Elevated night cortisol is the primary driver of insomnia and night sweats in perimenopause — a pattern frequently attributed to oestrogen deficiency alone but driven or compounded by cortisol dysregulation that HRT cannot address
- A flat cortisol curve — seen in advanced burnout — produces profound exhaustion, emotional numbness, and immune suppression that is clinically distinct from elevated-curve patterns and requires a different intervention; the two are indistinguishable from symptoms alone
Not Sure Which Test Is Right for You?
Email us at info@hormonelab.co.uk with your gender, age, symptoms, medications, and any current treatments. We will forward your enquiry to our doctors and respond within 24 hours.
How It Works
- Order your kit — delivered directly to your door
- Collect saliva at four time points: morning (within 30 minutes of waking, before 9am), noon, evening, and night — following the detailed instructions provided
- Post your samples to ZRT Laboratory using the return instructions provided
- Receive your full report by email within 3–5 working days
What You Receive
- All four cortisol readings with female-specific reference ranges
- Visual chart showing your complete daily cortisol rhythm curve
- Written interpretation by a Hormone Specialist PhD Doctor including cortisol–progesterone interaction, cycle impact, and phase-specific hormonal consequences
- Personalised next-step recommendations
- Laboratory fee included — no hidden charges
Why We Use ZRT Laboratory
All testing is performed by ZRT Laboratory — a globally recognised, CLIA-certified diagnostic laboratory founded in 1998 by Dr. David Zava, PhD. ZRT has performed over 11 million tests and is trusted by healthcare professionals in 96+ countries.
- Pioneers of at-home dried blood spot (DBS) and saliva hormone testing
- Advanced LC-MS/MS technology for clinical-grade accuracy
- Qualified for the CDC Hormone Standardization (HoSt) Program
- Personalised reference ranges based on age and sex
Through our partnership with ZRT Laboratory, Hormone Lab UK delivers internationally recognised, research-backed hormone testing to people across the UK and Europe — from the comfort of home.
Frequently Asked Questions
Why measure cortisol at four points rather than just the morning?
Each time point has distinct hormonal consequences for women. Morning cortisol assesses the Cortisol Awakening Response and progesterone suppression risk; noon assesses mid-day stress impact on cycle regularity; evening assesses whether cortisol is preventing the progesterone and melatonin rise needed for sleep; night assesses whether cortisol is driving insomnia or night sweats. A single reading cannot identify which phase is responsible for a woman’s symptoms.
When should I collect my samples during my menstrual cycle?
This test can be taken at any point in your cycle. Guidance on optimal timing is included in your kit instructions.
Can I use this test if I am on HRT, the contraceptive pill, or other hormonal medication?
Yes. This test is suitable for women on HRT, the contraceptive pill, or other hormonal medications. It is particularly valuable for identifying whether cortisol dysregulation is driving residual or breakthrough symptoms that hormone therapy is not addressing.
Should I start with just the morning cortisol test instead?
The morning test (SAL-CORT-AM-F) is an appropriate starting point if your symptoms are primarily morning-focused. If you have symptoms across different parts of the day — afternoon crashes, evening anxiety, or night waking — the 4-point profile is the more appropriate assessment and avoids the need for a second test.
Does the price include the laboratory fee?
Yes. The full laboratory analysis fee is included. There are no additional charges. You are only responsible for posting your samples to the laboratory.
How long is the kit valid for?
The kit must be used within 12 months of the purchase date.
Saliva Sample Collection Instructions
Collect your saliva samples at home using the materials supplied with your kit. Check your Test Requisition Form and kit instructions to confirm whether you need one, two or four samples. You may not need every tube supplied.
Read all instructions before collection, including the Hormone Users section if you take hormone treatment.
1. Confirm Your Collection Times
| Number of samples required | Collection times |
|---|---|
| One | Morning |
| Two | Morning and before bed |
| Four | Morning, before lunch, before dinner and before bed |
Use the large 10 mL tube for your morning sample and the smaller 5 mL tubes for later samples.
2. Choose Your Collection Day
Choose your collection day and mark it on your calendar. Record all current medicines on your Test Requisition Form.
Men, children and women who do not menstruate: Collect on any day of the month, following the hormone-treatment instructions below where applicable.
Women who menstruate: If testing estradiol, progesterone or testosterone, follow this schedule:
| Your usual menstrual-cycle length | When to collect |
|---|---|
| 23–26 days | Day 17, 18 or 19 |
| 27–30 days | Day 21, 22 or 23 |
| 31–34 days | Day 25, 26 or 27 |
| Shorter or longer regular cycles | 5–7 days before your next expected period |
| Infrequent or unpredictable cycles | Any non-bleeding day |
Day 1 is the first day of menstrual flow, not spotting. Ovulation timing varies with cycle length.
3. Hormone Users
Skip this section if you do not use hormones.
List all hormone treatments on your requisition form. This information helps the laboratory select appropriate reference ranges and provide relevant comments.
Continue prescribed hormone treatment. If the collection instructions require a change to your usual dosing time, confirm the timing with your prescriber.
Topical and Oral Hormones
- Continue your prescribed hormones on the day before testing.
- The laboratory specifies at least 12 hours between an evening dose and morning collection. For example, an 8 am collection requires the previous evening’s dose by 8 pm.
- Oral progesterone is an exception: it may be taken immediately before bed.
- For at least two days before collection, use gloves or an applicator when applying topical hormones rather than bare hands.
- Avoid applying hormones to the face, lips or neck.
Troches or Under-the-Tongue Hormones
These treatments are not recommended for saliva hormone testing because they can contaminate samples. Discuss an alternative, such as blood spot testing, with your healthcare professional. Samples may be fully or partially rejected.
Patches, Vaginal Rings, Pellets or Injections
The laboratory advises testing halfway between doses. Examples include approximately three days after a once-weekly patch or two weeks after a once-monthly injection.
Confirm the appropriate timing for your particular treatment with your prescriber.
Steroid Medicines
If you use glucocorticoids, including hydrocortisone or prednisone, ask your healthcare professional about collection timing.
Prevent Hormone Contamination
- Change your sheets, pillowcases and towels the night before collection.
- Avoid touching bathroom surfaces that may contain hormone residue.
- Dry your washed hands with a clean towel.
4. Prepare for Collection
Three days before collection
Avoid anti-ageing or anti-wrinkle facial creams and biotin/vitamin B7 supplements, including hair and nail formulas.
The night before collection
Stay normally hydrated without drinking excessive amounts. Both dehydration and overhydration can affect salivary hormone measurements.
Before your morning sample
Do not eat, drink anything except water, or brush your teeth.
Before any later samples
Do not eat, drink anything except water, or brush your teeth for at least two hours before collection.
5. Collect Your Samples
- Wash your hands with soap and water, then dry them with a clean towel.
- Rinse your mouth with water and wait five minutes.
- Begin your morning collection within 30 minutes of waking, using the large tube.
- Allow saliva to pool naturally in your mouth, then transfer it into the tube.
- Fill the tube at least halfway, excluding bubbles. Collection usually takes 15–30 minutes, depending on saliva flow.
- Screw the cap on securely.
- Label the tube with your name, collection date and collection time, then return it to its bag.
- Repeat these steps at any later required collection times, using the smaller tubes.
To encourage saliva flow: Try yawning, smelling food without eating it, or pressing the tip of your tongue against your teeth. Gently tap the tube on a hard surface to help remove bubbles.
6. Complete Your Paperwork and Return Your Samples
- Complete your requisition form fully, including your symptoms, medical history, medicines and hormone treatments.
- Place your labelled samples, requisition form and any additional paperwork inside the plastic test kit box.
- Include payment only if applicable under your kit’s arrangements.
- Snap the box lid shut and place the entire box inside the return packaging.
- Attach a prepaid label if supplied and applicable, or arrange the required postage.
- Return the package using the carrier specified in your kit instructions.
7. Storage and Collection Mistakes
Freeze any samples that will not be shipped within 24 hours. The laboratory states that samples remain stable under average shipping conditions, including weekends and holidays.
If you make a collection mistake, rinse the affected tube with hot water only—no soap. Shake out the remaining water, allow it to air-dry and restart collection at the appropriate time.
Before packing, check that every sample tube is at least halfway full of liquid saliva, excluding bubbles.
