What does a cortisol level of 3.9 mean?

A cortisol level of 3.9 micrograms per deciliter (µg/dL) can be considered within the normal range, depending on the time of day the test was taken, as cortisol levels fluctuate throughout the day. Typically, cortisol levels are highest in the morning and decrease throughout the day. It's important to interpret this result in the context of symptoms and other clinical findings, as well as to consult a healthcare professional for a comprehensive assessment. If you have concerns, discuss them with your doctor for personalized insight.