Cortisol Levels: What Is Normal and What High or Low Means
Order Cortisol Levels Blood TestQuick Answer
Cortisol rises and falls with the clock, so a single number only makes sense with the time it was drawn. This guide covers typical ranges, what high and low cortisol mean, and how to test.
Key Takeaways
- Cortisol is a stress hormone made by the adrenal glands that peaks in the early morning.
- A normal morning cortisol level for a woman is often about 6 to 23 mcg/dL.
- Cortisol naturally falls through the day and reaches its lowest point near midnight.
- High cortisol can cause weight gain around the midsection, easy bruising, and high blood sugar.
- Low cortisol can cause fatigue, dizziness, low blood pressure, and salt cravings.
- Direct-access cortisol testing typically costs about $40 to $90 without insurance.
What Is Cortisol?
Cortisol is a hormone made by the adrenal glands, two small glands that sit on top of the kidneys. It helps control blood sugar, blood pressure, inflammation, and the body's response to stress. Cortisol is not steady through the day. It follows a daily rhythm, rising sharply in the early morning to help you wake up and falling to its lowest level near midnight.
Because of that rhythm, a single cortisol number means little without knowing when the sample was taken. A level that is normal at 8 a.m. would be high at midnight, so time of collection is part of the result.
Cortisol also plays a role in blood sugar and blood pressure, which is why long stretches of high or low cortisol can affect the whole body, not just energy levels. The adrenal glands do not act alone. The pituitary gland in the brain releases ACTH, which tells the adrenals how much cortisol to make, so a full evaluation often looks at both glands.
Normal Cortisol Levels for Women and Men
Reference ranges vary by laboratory and by the time of collection. Typical approximate ranges are:
| Time of collection | Typical blood cortisol |
|---|---|
| Morning (about 6 to 8 a.m.) | About 6 to 23 mcg/dL |
| Afternoon (about 4 p.m.) | About 3 to 15 mcg/dL |
| Late night (about midnight) | Usually below 5 mcg/dL |
Sex does not change the target range much, so what is a normal cortisol level for a woman is close to the range for a man once the time of day is accounted for. Pregnancy, estrogen-containing medications, and shift work can all shift cortisol, so tell the lab about them before the draw.
It is also worth noting that reference ranges are built from a population, so a result near the top or bottom of the range can still be normal for you. Symptoms and the pattern over time usually carry more weight than one isolated number, which is why repeat testing is common when a result does not match how you feel.
What High Cortisol Means
High cortisol can come from ongoing stress, some medications, or a condition where the adrenal glands or pituitary gland make too much. When cortisol stays high, common signs include:
- Weight gain around the midsection and upper back
- A rounder face with thinner arms and legs
- Easy bruising and slow healing
- High blood sugar or high blood pressure
- Mood changes, anxiety, or trouble sleeping
- Weaker muscles and thinner skin
A pattern of high cortisol over time may point to Cushing syndrome, which needs evaluation by a clinician. A single high result is not enough to confirm it, and stress alone can raise a morning reading.
What Low Cortisol Means
Low cortisol can cause persistent fatigue, dizziness when standing, low blood pressure, nausea, weight loss, and salt cravings. It can happen when the adrenal glands are damaged, a condition called Addison disease, or when the pituitary gland stops signaling the adrenals to work.
Low cortisol that worsens can become an emergency, so symptoms such as severe weakness, confusion, or fainting should be taken seriously and checked quickly. Mildly low results are often repeated before any conclusion is drawn.
How Cortisol Is Tested
Cortisol can be measured in blood, saliva, or urine, and each method answers a slightly different question. A morning blood draw is the most common first step. An ACTH test is often added because it shows whether the problem starts in the adrenal glands or in the pituitary.
A late-night saliva sample can reveal a rhythm that has flattened, and a 24-hour urine test measures total output over a full day. Because timing drives the result, follow the collection instructions exactly. This guide is educational information, not medical advice.
Saliva testing is popular because it is easy to collect at home and can capture several points across a day, while a 24-hour urine test gives a total rather than a snapshot. Blood testing remains the most widely used and is the usual starting point when a clinician is looking for a specific condition.
How to Order Testing and Where to Get Tested
Direct-access lab testing lets you order cortisol or an ACTH test online and visit a local collection site without a physician order or insurance. You choose the tests, pay upfront, and get a blood draw at a CLIA-certified partner lab. Results usually arrive in a secure online account within one to three business days.
For a morning cortisol test, book the earliest appointment you can find and note the exact draw time. That detail is what makes the number interpretable.
How Much Does Cortisol Testing Cost
Self-pay pricing is shown before you order. A standalone blood cortisol test commonly costs about $40 to $90, and adding ACTH or other hormone markers usually brings the total to about $90 to $200. Prices vary by lab network and the markers included, and no insurance claim is filed.
Frequently Asked Questions
What is a normal cortisol level for a woman?
A typical morning cortisol level is about 6 to 23 mcg/dL, falling to roughly 3 to 15 mcg/dL in the afternoon and usually below 5 mcg/dL near midnight. Ranges vary by laboratory and collection time.
What are the symptoms of high cortisol?
Signs include weight gain around the midsection, a rounder face, easy bruising, high blood sugar or blood pressure, mood changes, and weaker muscles. A persistent pattern may point to Cushing syndrome.
What are the symptoms of low cortisol?
Low cortisol can cause fatigue, dizziness when standing, low blood pressure, nausea, weight loss, and salt cravings. It may be linked to Addison disease or a pituitary problem.
Does cortisol testing need to be done in the morning?
A morning draw is most common because cortisol peaks early. Saliva or 24-hour urine testing may be used instead to show the daily rhythm. Follow the timing instructions with your test.
Can I order a cortisol test without a doctor?
Yes. Direct-access lab testing lets you order cortisol or an ACTH test online and visit a local collection site without a physician order or insurance.
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This guide is reviewed for sourcing accuracy against the references listed above. It is educational information, not medical advice. Always consult a qualified healthcare provider about your own results and care.
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