What's the ideal serum value for the hormone ACTH?

[tea]

The lab provides a wide range (7.2 to 63.3).

I have had results over the range in many occasions which I know is not good.

After taking some cyproheptadine, even the night before the test, I got a result of 34, more in the middle of the range.

Does anyone know what the ideal value should be for this stress hormone? Should it be as low as possible?

Thank you!