I have just been phoned by the receptionist at my GP surgery to say my blood test for morning cortisol came back as less than 25nmol/L and that the GP didn’t know what that means. A quick Google search suggested I should be unconscious in an adrenal insufficiency crisis. It’s too late for me to phone the Asthma Clinic at the hospital but it’s going drive me nuts worrying about it all night. Does anyone else have any experience in this? The asthma clinic ordered the cortisol test because I’ve been reducing my prednisone (been on high daily doses for about a year) and have just got down to 5mg daily. Any help greatly appreciated. Thanks