Cortisol: units, conversion and tracking
Updated
Short answer
Cortisol is reported in µg/dL, nmol/L and ng/mL. 1 nmol/L = 0.03625 µg/dL.
Convert cortisol
Enter a value to see the converted result.
Converts units only and does not interpret a result. For other markers, use the full unit converter.
What is cortisol?
A steroid hormone made by the adrenal glands; levels vary through the day.
BiomarkerHQ groups cortisol under Hormones. On lab reports it can also appear as cortisol total, cortisol am, cortisol morning and serum cortisol.
Cortisol units and conversion
BiomarkerHQ stores each cortisol result in the unit printed on the report, and charts and compares results in µg/dL.
1 nmol/L = 0.03625 µg/dL
1 µg/dL = 27.59 nmol/L
1 ng/mL = 0.1 µg/dL
1 µg/dL = 10 ng/mL
| nmol/L | µg/dL |
|---|---|
| 100 nmol/L | 3.625 µg/dL |
| 200 nmol/L | 7.249 µg/dL |
| 300 nmol/L | 10.87 µg/dL |
| 400 nmol/L | 14.5 µg/dL |
| 500 nmol/L | 18.12 µg/dL |
| 600 nmol/L | 21.75 µg/dL |
| 700 nmol/L | 25.37 µg/dL |
| µg/dL | nmol/L |
|---|---|
| 5 µg/dL | 137.9 nmol/L |
| 10 µg/dL | 275.9 nmol/L |
| 15 µg/dL | 413.8 nmol/L |
| 20 µg/dL | 551.8 nmol/L |
| 25 µg/dL | 689.7 nmol/L |
| 30 µg/dL | 827.7 nmol/L |
| 40 µg/dL | 1104 nmol/L |
For another value, use the lab unit converter. It converts units only and does not interpret a result.
Before comparing cortisol results
Tracking cortisol over time
In BiomarkerHQ, each cortisol result is saved with its collection date, its unit and the reference range printed on that report. The timeline charts the results across your draws against the range from each of your own reports, and any two draws can be compared side by side.
- Keep the unit printed on each report. Convert only to compare.
- Keep each report's own range with its result. See why ranges differ between labs.
- Compare the same lab and conditions where you can. See how to compare two blood tests.
Frequently asked questions
Which units do labs report cortisol in?
Cortisol is reported in µg/dL, nmol/L and ng/mL. BiomarkerHQ stores each result in the unit printed on the report and uses µg/dL for charts and comparisons.
How do I convert cortisol from nmol/L to µg/dL?
1 nmol/L = 0.03625 µg/dL. For example, 400 nmol/L is 14.5 µg/dL.
How do I convert cortisol from µg/dL to nmol/L?
1 µg/dL = 27.59 nmol/L. For example, 20 µg/dL is 551.8 nmol/L.
What should I check before comparing cortisol results?
Cortisol changes through the day, so the collection time matters when comparing results.
Does BiomarkerHQ interpret my cortisol result?
No. It compares a result only with the reference range printed on your own lab report, as below, within or above, and does not say what the result means. Talk to a qualified clinician about your results.
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