Hi. What does the doctor who ordered the tests telling you? Cushing syndrome can be hard to diagnose and can take a long time to figure it out. Here's an article on it from mayo clinic. https://www.mayoclinic.org/diseases-conditions/cushing-syndrome/diagnosis-treatment/drc-20351314 They run the tests you've had and others to make that diagnosis. Your cortisol level of below 10 is considered low. That can be because of Addison’s disease or Hypopituitarism. Not saying it is, but these are possibilities to talk to your doctor about. However, this is just the values that one source I use give for cortisol levels. You need to find out the values your lab uses to determine if this is outside of normal. I would say that for the ACTH, you need to find out the values from the lab for where they put normal. The source I use has your number as low here as well. Cushings is usually diagnosed when that number is above normal. So, get clarification from your lab and your doctor and let me know what they say!