How many types of transformation zones are there? In the colposcopy report, you can see three types of transformation zones, of which types 1 and 2 are satisfactory colposcopic findings and type 3 is unsatisfactory colposcopic findings. The latter type is due to the internal displacement of the transformation zone, as we said earlier, as if a young girl closed her cherry mouth shyly and her red lips were blocked, at this point, the diagnostic significance of colposcopy and direct visual biopsy alone is very limited. We need to use other methods to clarify the diagnosis. Type 1 transformation zone: The transformation zone is completely outside the cervical opening and is visible in its entirety, and can be large or small. Type 2 transformation zone: The transformation zone is partially inside the cervical os and is fully visible. It is partially outside the cervical os and can be large or small. Type 3 transformation zone: The transformation zone is partially located in the cervical orifice and is not fully visible, but can be partially located outside the cervical orifice and can be large or small.