They tend to call abnormal cells mild, moderate, severe or low moderate high roughly translating to CIN 1,2,3. Like I say smears aren't higely accurate. at the colposcopy they will be able to see what it looks like (they are pretty good at judging by sight) and will biopsy. I've had Vain (vaginal equivalent of CIN) my last smear said severe changes, at colposcopy they thought it looked severe but biopsy showed moderate. Likewise I've had looks severe and came back as borderline.
CIN3, if it is CIN 3, is very treatable so please try not to panic too much, which I know is easier said than done.