Welcome!

It can be done by someone with access to the norm tables (which should be a qualified examiner), but I suspect that those types of scores won't be accepted by DYS anyway. You need an official evaluation report from the examiner. Are you asking if you can generate your own scores, or just trying to figure out if it's worth going back to the examiner for a formal report?

...pronounced like the long vowel and first letter of the alphabet...