acth level below 5 at 8 in mourning

hi i got diagnoised with acth defeicency back in april put on hydrocortisone been unwell the last 7 weeks went into crisis 3 weeks ago whilst in hospital they did a short stem cythercin test which came back was addisons i been waiting for acth to come back and it came back today as below 5 at 8 in the the mourning is this normal for addisons my last acth in april was 10 and my cortisol was 63 im just confused

[rumpled]

Without ranges and time of day (is it 8 for all tests?) it is kinda hard to tell much here. ACTH can also be low due to lab handling (if not spun right away it simply degrades to a low reading).

Addison's and AI are pretty much the same thing - except the cause may be different.