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Atlas of colposcopy principles and practice

Transformation zone Types of transformation zone

  

Depending on the location and the visibility of the SCJ, the transformation zone (TZ) is categorized into type 1, type 2, or type 3:

  • TZ Type 1: The SCJ is fully visible and is located fully on the ectocervix.





  • Type 2 TZ: The SCJ is fully visible (with or without an endocervical speculum) and is located either fully or partially within the endocervical canal.




  • Type 3 TZ: The SCJ is within the endocervical canal and is only partially visible or not at all visible, even using an endocervical speculum.


































  
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