A cortisol of 19.5 in the morning
19.5 µg/dL
Within the range for this hour
Cortisol of 19.5 µg/dL measured in the morning is inside the range expected at this time of day by commonly reported reference ranges for the time of day
| Where it fallscommonly reported reference ranges for the time of day | Within the range for this hour |
|---|---|
| Cortisolmeasured in the morning | 19.5µg/dL |
| Usual reference range | 6 – 23µg/dL |
| Markedly low | under 3µg/dL |
| Below the range for this hour | 3 – 5.9µg/dL |
| Within the range for this hourthis reading | 6 – 22.9µg/dL |
| Above the range for this hour | 23.1 – 45.9µg/dL |
| Markedly raised | 46 and aboveµg/dL |
Notes
- One reading is not a diagnosis. Cortisol moves with the hour of day above all — it peaks shortly after waking and falls to a trough around midnight — plus stress, illness, pregnancy and steroid medicines. A clinician reads it against your history and usually against a repeat, not on its own.
- Reference ranges differ between laboratories. The bands above follow commonly reported reference ranges for the time of day. Your own report prints the range its analyser was calibrated against, and that printed range is the one to compare against — a difference of a few units between labs is normal and does not mean either is wrong.
- The time of the draw is part of the result. Cortisol follows a daily rhythm: it peaks 30 to 45 minutes after waking and falls to a trough near midnight. A value of 15 µg/dL is unremarkable at 8 am and distinctly high at 4 pm. A cortisol reported without the time it was taken is close to uninterpretable, which is why blood is normally drawn between 7 and 9 am.
- A single measurement rarely settles anything. Suspected excess is investigated with an overnight dexamethasone suppression test, late-night salivary cortisol, or a 24-hour urine collection; suspected deficiency with a morning value plus an ACTH stimulation test. The single blood level is a screening step, not an answer.
- Steroid medicines change the picture completely. Prednisolone, dexamethasone and even potent inhaled or topical steroids suppress the body's own production, so a low result in someone taking them says what would be expected rather than revealing disease. Biotin supplements also interfere with several cortisol assays.
What cortisol of 19.5 µg/dL means
A result of 19.5 µg/dLmeasured in the morning falls in Within the range for this hour by commonly reported reference ranges for the time of day.
The usual reference range is 6 – 23 µg/dL.
Reading it next to the rest of the panel
Almost no blood test answers a question on its own. Each one narrows the field, and what narrows it further is the value sitting beside it on the same report — which is why a printout with one figure circled is harder to interpret than the whole page.
The bands here come from a named source rather than a rounded rule of thumb. A threshold is a decision point somebody argued for in print, and knowing which document a line comes from is what separates a meaningful result from a borderline one.
Nearby sizes
Read more
- CBC Normal Ranges — What Each Line on the Result MeansA value marked high or low on a CBC is common and is often not significant on its own. The pattern across lines is what a clinician reads.
- eGFR Normal Range: Above 90, and the Stages Below IteGFR is an estimate built from creatinine, age and sex — and the estimate is better than the raw creatinine it comes from, for a reason worth understanding.
- TSH Normal Range: 0.4–4.0 mIU/L, and the Number Moves BackwardsTSH runs opposite to the gland it measures. High TSH means the thyroid is underactive, and that inversion catches almost everyone reading their own result.
- Cholesterol Numbers: What Total, LDL, HDL and Triglycerides MeanA lipid panel reports four numbers and the one printed largest — total cholesterol — is the least useful of them.