Cortisol Test How To

Feeling exhausted no matter how much you sleep? Gaining weight around your midsection despite eating carefully? Waking up at 3 a.m. with a racing heart and no obvious reason? These are exactly the kinds of symptoms that send people searching for answers — and cortisol is often at the center of the conversation.

Cortisol is your body's primary stress hormone, and it plays a far bigger role in your health than most people realize. It governs your sleep-wake cycle, regulates blood sugar, influences immune function, and shapes how your body stores fat. When cortisol levels are chronically too high or too low, the downstream effects can touch nearly every system in your body.

But here is the thing: cortisol is genuinely tricky to test correctly. Unlike cholesterol or blood glucose, there is no single "right" way to measure it, and the time of day you collect a sample matters enormously. Getting accurate results requires understanding which test type fits your situation, what the timing rules are, and how to prepare your body so the results actually reflect what is happening inside you.

This guide walks you through all of it — from blood draws to saliva swabs to 24-hour urine collections — so you can go into the process informed, prepared, and confident.

Table of Contents

1. What Is a Cortisol Test and What Does It Measure?
2. The Three Main Cortisol Testing Methods
3. Cortisol Blood Test: What to Expect
4. Cortisol Saliva Test: How It Works
5. Cortisol Urine Test: The 24-Hour Collection
6. How to Test Cortisol Levels at Home
7. How to Prepare for a Cortisol Test
8. What Can Affect Your Cortisol Results?
9. Understanding Your Results: High and Low Cortisol
10. Which Cortisol Test Is Right for You?
11. Frequently Asked Questions

What Is a Cortisol Test and What Does It Measure?

A cortisol test measures the concentration of cortisol — a steroid hormone produced by the adrenal glands, which sit on top of each kidney — in your blood, saliva, or urine. Doctors order cortisol level testing to evaluate how well your adrenal glands are functioning and to identify disorders caused by too much or too little of this critical hormone. [1][2][3]

Cortisol production follows a predictable daily rhythm controlled by your brain's hypothalamus and pituitary gland. Levels are highest in the early morning, typically peaking around 8 a.m., and then gradually fall throughout the day, reaching their lowest point around 11 p.m. to midnight. [1][2][3] This pattern is called the diurnal cortisol rhythm, and it is so central to accurate testing that almost every cortisol protocol specifies exactly what time samples should be collected.

What Conditions Does Cortisol Testing Help Diagnose?

Doctors commonly use cortisol tests to investigate or monitor:

• Cushing's syndrome — a condition caused by chronically elevated cortisol, often due to a tumor on the pituitary or adrenal gland, or from long-term corticosteroid medication use
• Addison's disease — a condition in which the adrenal glands produce too little cortisol and, often, aldosterone
• Adrenal insufficiency — insufficient cortisol production, sometimes secondary to pituitary dysfunction
• Adrenal tumors — benign or malignant growths that can disrupt hormone production
• Pituitary disorders — because the pituitary releases adrenocorticotropic hormone (ACTH), which signals the adrenals to produce cortisol

Beyond these clinical diagnoses, many people pursue cortisol testing because they suspect chronic stress, burnout, or HPA axis dysfunction is affecting their energy, sleep, or weight. Functional medicine providers and integrative practitioners often use cortisol tests as part of a broader hormonal workup.

The Three Main Cortisol Testing Methods

When people ask how do I test my cortisol, the answer depends on what information is needed and why. Cortisol is typically tested in blood, urine, or saliva, and each method captures slightly different information about how cortisol is behaving in your body. [1][2][3]

Here is a quick overview before we dive into each method in detail:

| Test Type | What It Measures | Collection Setting | Best For | |---|---|---|---| | Blood (serum) | Total cortisol at a specific moment | Lab or clinic | Baseline morning/afternoon cortisol, Addison's/Cushing's workup | | Saliva | Free (unbound) cortisol at a specific moment | Home or clinic | Diurnal pattern, late-night cortisol, HPA axis assessment | | 24-hour urine | Total free cortisol excreted over a full day | Home collection | Cushing's syndrome evaluation, average daily output |

Each of these methods has strengths and limitations, and in many clinical situations, more than one test type may be ordered together to build a complete picture.

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Cortisol Blood Test: What to Expect

The cortisol blood test — also called a serum cortisol test — is the most traditional and widely used method. A healthcare professional draws blood from a vein, usually in the arm, and the sample is sent to a laboratory for analysis. [1][2][3]

Timing Is Everything: The AM Cortisol Blood Test

Because cortisol follows such a strong daily rhythm, the timing of your blood draw is not just a suggestion — it is a clinical requirement for accurate interpretation. The AM cortisol blood test is the most common version ordered by physicians.

Labcorp specifies that blood should be drawn at 8 a.m. and 4 p.m. to evaluate baseline diurnal variation. [4] Canberra Health Services similarly specifies 8:00–10:00 a.m. and 4:00–5:30 p.m. for a diurnal cortisol blood test. [5] These two time points capture cortisol at its expected daily peak and its expected afternoon decline, giving the clinician data about both the absolute level and the pattern of change across the day.

If only a single blood draw is ordered, it is almost always the morning draw — ideally collected right around 8 a.m. — because this is when normal cortisol is highest and most clearly distinguishable from abnormal values.

What Happens During the Blood Draw

The process is straightforward:

1. You arrive at the lab or clinic, ideally at or close to the specified time window
2. A phlebotomist cleans the skin on your inner arm and inserts a small needle into a vein
3. Blood is drawn into one or more collection tubes — the entire process usually takes under five minutes
4. The sample is labeled, processed, and sent to the laboratory
5. Results typically return within one to two business days, depending on the lab

Normal Blood Cortisol Ranges

Normal reference ranges vary slightly between laboratories because of differences in assay methods, but general reference values for serum cortisol are approximately:

• Morning (8 a.m.): 6–23 micrograms per deciliter (mcg/dL)
• Afternoon (4 p.m.): 2–11 mcg/dL [2][3]

A result that is consistently high, consistently low, or that does not show the expected morning-to-afternoon decline may prompt further investigation.

Cortisol Saliva Test: How It Works

The cortisol saliva test has become increasingly popular in both clinical and at-home settings because it is non-invasive, can be collected at home, and measures free cortisol — the biologically active form that is not bound to carrier proteins. [1][2][3]

Why Late-Night Saliva Testing Matters

While blood testing is most commonly done in the morning, saliva testing is often specifically ordered for a late-night sample. This is because cortisol is normally at its lowest point around 11 p.m. to midnight. [1][2][3]

In people with Cushing's syndrome, cortisol does not suppress properly at night, so a late-night salivary cortisol that is elevated above normal is a sensitive screening marker. Many doctors order a late-night salivary cortisol test as an initial step in evaluating suspected Cushing's syndrome, alongside or before a 24-hour urine collection.

For functional and integrative assessments, practitioners often order a four-point or diurnal salivary cortisol test, with samples collected in the morning, midday, evening, and late night. This approach maps the full arc of cortisol output across the day and can reveal patterns — like a flat curve, a delayed peak, or a pattern that rises at night instead of falling — that point to HPA axis dysregulation.

How to Collect a Saliva Sample

Saliva cortisol test kits typically include one or more small tubes or absorbent swabs called Salivettes. The basic collection process is:

1. Follow the preparation instructions (detailed below) for the required waiting period before collection
2. Open the collection device and place it in your mouth
3. Allow saliva to passively pool in the tube, or gently chew the swab to stimulate saliva flow — the kit instructions will specify which method to use
4. Cap the tube securely
5. Label it with the collection time and date
6. Store it as directed (usually refrigerated or frozen) until you can transport or mail it to the lab

Critical Preparation Rules for Saliva Testing

Patient instructions commonly require no eating, drinking, brushing teeth, flossing, smoking, or vaping for 30 minutes before collection. [1][2][3] This waiting period is essential because:

• Food and drink can alter the pH of your mouth and dilute or contaminate the sample
• Brushing or flossing can cause minor gum bleeding, and blood in saliva significantly elevates measured cortisol levels
• Nicotine from smoking or vaping can acutely stimulate cortisol release

If you bleed from your gums or accidentally eat or drink during the waiting period, it is best to discard that collection and try again after the full waiting period has passed, if possible.

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Cortisol Urine Test: The 24-Hour Collection

The cortisol urine test — more precisely, the 24-hour urine free cortisol test — provides a picture of your total cortisol output over an entire day rather than a snapshot at a single point in time. [1][3] This makes it particularly useful for evaluating Cushing's syndrome, where cortisol production is chronically elevated and a single-point measurement might miss peaks that occur at variable times.

Why 24 Hours?

Cortisol fluctuates throughout the day in response to stress, meals, exercise, and your natural circadian rhythm. A 24-hour collection averages out those fluctuations and measures the total amount of cortisol that your kidneys filter out of your blood and excrete in urine. This is a more stable measure of overall cortisol burden than any single blood or saliva sample.

How to Do a 24-Hour Urine Cortisol Collection

Instructions commonly require collecting all urine for 24 hours, refrigerating it during collection, and returning it promptly to the lab. [1][3] Here is the typical step-by-step process:

Day 1 — Starting the Collection

1. Choose a start time in the morning, such as 7 a.m. or 8 a.m.
2. When you first wake up and urinate, flush this first void — do not collect it. Note the exact time, because this is your official start time.
3. From this point forward, collect every urination into the large container provided by the lab

Throughout the 24 Hours

1. Store the container in the refrigerator between voids. Cortisol degrades at room temperature, and refrigeration preserves the sample
2. If you need to use a public restroom during the 24 hours, collect into a smaller clean container and transfer it to the main container as soon as possible
3. Drink normal amounts of fluid — do not restrict or dramatically increase fluid intake, as both can affect results

Day 2 — Ending the Collection

1. At exactly 24 hours after your start time (e.g., 7 a.m. the next morning), collect your final void — this is included in the collection
2. Record the total volume of urine collected, as the lab may ask for this
3. Transport the container to the lab as directed — most labs ask that it be returned within a few hours

Common Mistakes to Avoid

• Missing even one void can significantly alter results — treat every urination as critically important
• Allowing the container to sit at room temperature for extended periods
• Not noting the start and end times precisely
• Forgetting to collect a nighttime void if you urinate during the night

How to Test Cortisol Levels at Home

One of the most common searches people make is for ways to check cortisol at home — and the good news is that genuinely useful at-home testing is available. At-home cortisol tests are commonly sold as saliva tests, with some urine or blood spot options available. Results are typically returned online after mailing the sample to the lab. [2][7]

What At-Home Cortisol Testing Actually Looks Like

A cortisol test kit ordered online or purchased from a health retailer typically includes:

• Collection device (saliva tube, Salivette swab, urine container, or finger-prick blood spot card)
• Detailed instruction sheet specific to the test type
• Biohazard bag for the sample
• Pre-paid return shipping envelope or box (in most kits)
• Information on how to create an account and access results online

You follow the collection instructions at home — at the specified time of day — then mail the sample to the affiliated laboratory. Results are typically available through a secure online portal within five to ten business days, depending on the provider.

Saliva Kits: The Most Common At-Home Option

Most consumer cortisol test kits focus on salivary cortisol because it is genuinely measurable from saliva, requires no needles, and can be reliably collected at home with no specialized equipment. Diurnal saliva panels — where you collect four samples at different times of day — are popular with functional medicine providers and people investigating burnout, fatigue, or sleep disruption.

Urine Kits

Some at-home kits include instructions and materials for a 24-hour urine collection done entirely at home, with a prepaid shipping label for a temperature-controlled return. Others test a single morning urine sample for cortisol-to-creatinine ratio, which adjusts for urine concentration and can be a useful marker of daily cortisol excretion.

Blood Spot Kits

A smaller number of at-home test kits include a finger-prick lancet and blood spot collection card. You prick your fingertip, allow drops of blood to fall onto the card, let it dry, and mail it back. Blood spot cortisol testing is less common in consumer kits than saliva but is used in some specialty panels.

Important Caveats About At-Home Testing

At-home cortisol testing is genuinely useful for identifying patterns and prompting meaningful conversations with healthcare providers. However, it is not a substitute for clinical evaluation. If results from a cortisol test at home are outside the reference range, work with a physician to determine whether further clinical testing — such as a morning serum cortisol, a low-dose dexamethasone suppression test, or imaging — is appropriate.

How to Prepare for a Cortisol Test

Preparation matters enormously for cortisol testing. Because cortisol responds so dramatically to acute stressors, even the experience of being nervous about a test can temporarily spike levels. Here is how to prepare for each type of test.

General Preparation for All Cortisol Tests

Timing: Confirm the exact time window for your test and plan your schedule around it. For an AM cortisol blood test, this may mean arriving at the lab before 8 a.m. and arranging your morning routine accordingly.

Medications: Many medications can affect cortisol results. [2][3] Tell your doctor and the lab about all medications you take, including:

• Corticosteroids (prednisone, dexamethasone, hydrocortisone) — these can significantly suppress cortisol or interfere with the assay
• Hormonal contraceptives — can elevate cortisol-binding globulin, affecting total blood cortisol levels
• Diuretics, antifungals, and certain psychiatric medications

Your doctor may ask you to temporarily stop certain medications before testing, but never discontinue a medication without medical guidance.

Stress and Activity: Try to avoid intense exercise, significant emotional stress, and sleep deprivation in the 24 hours before testing. All of these can acutely alter cortisol levels.

Specific Preparation for a Blood Cortisol Test

• Fasting: Check with your ordering physician. Some protocols require fasting for several hours before the draw; others do not. WebMD and MedlinePlus note that your provider will give you specific fasting instructions. [2][3]
• Arrive on time: Getting there at the right time point within the specified window is critical
• Rest before the draw: Sit calmly for a few minutes before the blood is drawn — the act of rushing to the lab and being physically stressed can elevate results

Specific Preparation for a Saliva Cortisol Test

• No eating, drinking, brushing teeth, flossing, smoking, or vaping for 30 minutes before collection [1][2][3]
• Rinse your mouth with water about 10 minutes before the collection window begins
• Collect the sample at the time specified by the laboratory — morning, midday, evening, and/or late-night depending on the panel ordered

Specific Preparation for a 24-Hour Urine Test

• Follow the exact start and end times
• Refrigerate the collection container throughout
• Avoid excessive fluid intake or restriction
• Note any medications taken during the collection period, as the lab may need this information

What Can Affect Your Cortisol Results?

Even with careful preparation, a number of factors can alter cortisol levels and potentially confound test results. Understanding these gives you more control over the accuracy of your testing. [2][3]

Physical Factors

Exercise: Intense physical activity causes an acute cortisol spike. A hard workout the morning before a test can temporarily elevate blood cortisol significantly. Avoid strenuous exercise in the 24 hours before testing when possible.

Sleep: Sleep deprivation raises cortisol. If you had a poor night of sleep before your morning blood draw, results may be elevated. Note any significant sleep disruption when discussing results with your provider.

Illness: Acute illness — including infections, injuries, or surgery — dramatically elevates cortisol as part of the body's stress response. If you are acutely unwell, discuss whether to postpone testing with your doctor.

Pregnancy: Cortisol levels rise significantly during pregnancy, particularly in the second and third trimesters. Reference ranges do not apply in the same way during pregnancy.

Psychological Factors

Anxiety and acute stress: The anticipation of medical procedures, work stress, family conflict, or any acute psychological stressor can elevate cortisol. The effect is most pronounced in the hour following the stressor.

Chronic psychological stress: People experiencing chronic, ongoing stress — burnout, caregiving, relationship conflict — often have dysregulated cortisol patterns that are what is being assessed. Be honest with your provider about your overall stress load so results can be interpreted in context.

Medications and Substances

Corticosteroids: Even topical or inhaled steroids can suppress the HPA axis and lower measured cortisol. [2][3] Alcohol: Chronic heavy alcohol use is associated with elevated cortisol. Even acute alcohol consumption can affect next-day levels. Caffeine: Moderate caffeine consumption may transiently elevate cortisol, particularly in people who do not regularly consume it. Nicotine: Smoking and vaping stimulate cortisol release, which is one reason you must avoid both for 30 minutes before a saliva collection.

Timing Errors

Missing the collection time window is one of the most common sources of inaccurate cortisol results. A sample collected at 10 a.m. instead of 8 a.m. may show lower levels simply because cortisol has already begun its normal morning decline — not because anything is wrong with your adrenal function. Precision matters.

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Understanding Your Results: High and Low Cortisol

Once you have your results in hand, understanding what they mean requires context. Abnormal cortisol does not automatically indicate disease — many factors affect cortisol transiently — but persistent abnormalities do warrant medical follow-up. [2][3]

What High Cortisol May Indicate

Consistently elevated cortisol — particularly when the normal diurnal decline is absent — may suggest:

Cushing's syndrome: The hallmark presentation involves chronically high cortisol due to excess ACTH from a pituitary adenoma (Cushing's disease), an adrenal tumor, or ectopic ACTH production. Symptoms often include weight gain concentrated in the abdomen and face, a fatty deposit between the shoulder blades ("buffalo hump"), stretch marks, easy bruising, high blood pressure, and mood changes.

Chronic psychological stress: Ongoing stress can sustain elevated cortisol without any underlying disease. This is clinically significant but requires a different management approach than a tumor.

Exogenous corticosteroid use: Taking prednisone or similar drugs — even at modest doses — can substantially suppress your HPA axis and interfere with cortisol interpretation.

Other causes: Obesity, depression, alcoholism, and poorly controlled type 2 diabetes are all associated with altered cortisol patterns.

What Low Cortisol May Indicate

Persistently low cortisol may suggest:

Addison's disease (primary adrenal insufficiency): The adrenal glands do not produce enough cortisol and often aldosterone as well. Symptoms include chronic fatigue, weight loss, low blood pressure, salt craving, skin darkening (hyperpigmentation), and nausea.

Secondary adrenal insufficiency: The pituitary gland does not produce adequate ACTH to signal cortisol production. Often caused by a pituitary tumor, surgical damage, radiation, or long-term corticosteroid use that has suppressed the axis.

HPA axis suppression: Long-term use of corticosteroid medications can suppress your body's own cortisol production. When the medication is stopped, it can take weeks to months for natural production to recover.

What to Do With Your Results

If your results are outside the reference range on a single test, do not panic. One abnormal result typically prompts confirmatory testing — because cortisol is so sensitive to transient factors, clinicians generally require at least two abnormal values before pursuing a diagnosis. If your results are clearly abnormal, your provider will likely recommend additional testing such as:

• A low-dose dexamethasone suppression test (LDST) for high cortisol
• A cosyntropin (ACTH) stimulation test for low cortisol
• Imaging of the adrenal glands or pituitary

Which Cortisol Test Is Right for You?

Choosing between blood, saliva, and urine cortisol testing — or a combination — depends on your symptoms, your provider's clinical goals, and the practical realities of your situation. Here is a summary to help orient the conversation with your healthcare team.

Choose a Blood Cortisol Test If:

• Your doctor wants a straightforward baseline morning cortisol measurement
• You are being evaluated for Addison's disease or adrenal insufficiency (blood is preferred for this)
• You need a test result that is directly comparable to established clinical reference ranges
• You are having an ACTH stimulation test, which requires blood draws at multiple time points
• An AM cortisol blood test is required as part of a standard endocrinology workup

Choose a Saliva Cortisol Test If:

• You want to assess your cortisol pattern across the full day (diurnal panel)
• You are being screened for Cushing's syndrome with a late-night salivary cortisol
• You want to collect samples at home without a venipuncture
• A functional medicine or integrative provider has recommended it as part of an adrenal or HPA axis assessment
• You are interested in how stress, sleep, or lifestyle is affecting your cortisol rhythm

Choose a 24-Hour Urine Test If:

• Your physician is evaluating for Cushing's syndrome and wants a measure of total daily cortisol output
• A single time-point test has returned equivocal results
• You need an average daily cortisol measure that smooths out moment-to-moment variability

Consider an At-Home Test Kit If:

• You do not currently have a healthcare provider guiding this process and want initial data to bring to an appointment
• You are monitoring a known pattern over time
• Your provider has recommended a diurnal saliva panel and offered a kit as part of a functional medicine protocol
• Accessibility to a clinical lab is limited

Frequently Asked Questions

How do I test my cortisol without going to a doctor?

You can use a cortisol test at home by purchasing a cortisol test kit online or from a health retailer. Most at-home kits use saliva collection, though some offer urine or blood spot options. You collect your sample following the kit instructions, mail it to the affiliated laboratory, and access your results online. Results from at-home tests are genuinely useful but work best when reviewed with a healthcare provider who can put them in clinical context.

Do you need to fast before a cortisol blood test?

Fasting requirements vary by the specific test protocol and your ordering physician's instructions. Some cortisol blood test protocols do require several hours of fasting, while others do not. [2][3] Always confirm fasting requirements with your provider or the lab before your appointment.

What time should I get my cortisol tested?

For a blood cortisol test, the most clinically meaningful time is typically 8 a.m., when cortisol is at its natural daily peak. Some protocols also require a second draw at around 4 p.m. to evaluate the diurnal decline. [4][5] For saliva testing, the time depends on whether you are testing for a morning peak, a midday level, or — very commonly in Cushing's screening — a late-night sample around 11 p.m. to midnight. [1][2][3]

What should I avoid before a saliva cortisol test?

For 30 minutes before collecting a saliva sample, avoid eating, drinking anything other than water, brushing your teeth, flossing, smoking, and vaping. [1][2][3] Rinse your mouth with plain water about 10 minutes before the collection window opens. Avoid anything that could cause gum bleeding, as blood in saliva significantly elevates measured cortisol.

What medications can affect cortisol test results?

Corticosteroids (prednisone, dexamethasone, hydrocortisone, and inhaled or topical steroids), hormonal contraceptives, certain antifungal medications, diuretics, and some psychiatric medications can all affect cortisol levels or how cortisol is measured in a test. [2][3] Always tell your provider and the lab about all medications you are taking so results can be interpreted accurately.

Can stress affect my cortisol test results?

Yes, significantly. Acute psychological stress — including anxiety about a test, a difficult conversation, work pressure, or rushing to reach a lab on time — can transiently elevate cortisol. [2][3] This is why preparation instructions often include advice to rest calmly before the blood draw. Chronic, ongoing stress can also produce persistently altered cortisol patterns.

How long does it take to get cortisol test results?

For a blood or urine test processed through a clinical lab, results typically return within one to two business days. At-home test kits that require mailing a sample generally return results in five to ten business days, with results available through a secure online portal.

Can I test cortisol at home accurately?

At-home saliva cortisol testing is a genuinely valid measurement method when collected correctly and processed by an accredited laboratory. The key factors are following the collection timing and preparation instructions precisely, using a kit from a reputable company with lab accreditation, and interpreting results in context. At-home cortisol level testing works best as part of a broader health conversation, not as a standalone diagnosis.

What happens if my cortisol is high or low?

A single abnormal result is usually not enough to make a diagnosis. If results are persistently abnormal across more than one test, your provider may order confirmatory testing — a dexamethasone suppression test for high cortisol, or an ACTH stimulation test for low cortisol — along with imaging if needed. [2][3] The clinical meaning of abnormal cortisol depends entirely on the full picture of your symptoms, health history, medications, and additional test results.

Is there a difference between a cortisol test kit and a clinical lab test?

The core measurement — how much cortisol is in a sample — can be equally accurate in both settings, provided the at-home kit is processed by an accredited laboratory. The main differences are in convenience, cost, and the degree of clinical oversight. Clinical lab tests ordered by a physician are covered by insurance in many cases and come with professional interpretation. At-home kits are typically paid out of pocket and may not provide the clinical interpretation that a physician-ordered test does.

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A Final Word on Cortisol Testing

Understanding cortisol test how to do it correctly is not just a technical exercise — it is about making sure the data you get reflects what is actually happening in your body, not an artifact of timing, preparation mistakes, or transient stress.

Cortisol is a hormone that tells a compelling story about your biology, but only if the test is done right. The morning blood draw needs to happen at the right time. The saliva sample needs to be collected without food, drink, or toothbrushing in the preceding 30 minutes. The 24-hour urine cannot miss a single void. These details are not bureaucratic red tape — they are what separate meaningful data from noise.

Whether you are pursuing cortisol level testing through your physician, exploring a cortisol test kit at home, or following up on symptoms that have puzzled you for months, you are now equipped to do it thoughtfully. Take the preparation seriously, communicate openly with your healthcare team about all medications and health conditions, and treat any results as a starting point for conversation — not a final verdict.

Your cortisol story is worth understanding clearly. Now you know how to read it.

This article references Cleveland Clinic [1], WebMD [2], MedlinePlus [3], Labcorp [4], and Canberra Health Services [5] for clinical guidance on cortisol testing methods, timing, and preparation. This content is for informational purposes only and does not constitute medical advice. Always consult a qualified healthcare provider before making decisions about testing or treatment.