Hi
The letter didn't mention anything about my score. I just did the self-
evaluation test at cic site and calculated my score.
I am not from a native speaking country. But, I have been in USA for
more than 6 years; I also had Masters and Ph.D. from USA. I sent them a
letter few months ago justifying my english skills. I didn't take the
IELTS test and they didn't ask for it.
Hope this helps