Hi phaedrus,
My dr told me that they can tell from the colpo biopsy results if the abnormal cells have spread past the base membrane. He explained that the pathologist takes each piece of tissue (yuck!

) and makes a vertical cut, looking for the extent of dysplasia. Roughly, if 1/3 of the epithelium is taken up by abnormal cells, it is CIN1; if 2/3, then CIN2; if 3/3 are dysplastic, then it is CIN3, i.e. severe (high grade) dysplasia. If the dysplasia has proceeded past the base membrane, then it is invasive cancer. (But even in this case there are grades according to how many millimeters the cells have spread past the membrane, so nothing is decided yet!!!)
However, do not freak out over CIN numbers. As I learned on this site, the pathologist will give you a CIN3 "verdict" even if s/he sees only a few CIN3 cells. My dr has confirmed this. They always go by the highest grade cells, no matter how few they are. Your post-LEEP biopsy could come back as CIN2 for all you know!
I hope you can find the strength to relax and take care of yourself until the LEEP. From what I have read and the dr tells me, they should have been able to tell from the colpo biopsies if it was cancer, so if they are saying just dysplasia, chances are this is all it is.
Hugs and best, best wishes.