Borderline smear but CIN 3 on colposcopy

quite simply i dont understand how my smear can show a borderline result but the biopsy says cin 3? Surely my smear should have said moderate or severe changes?

Hello,

I can understand that this must seem confusing. In brief, a smear brushes off a small sample of surface cells while a biopsy removes a small piece of tissue. In the tissue sample there are more cells that they can look at, and this is why the biopsy result can be different. It may be the cells swiped during your smear were only showing slight changes, but the good thing is it alerted them to examine you further.

I hope this helps.

All the best.