Atlas of Colposcopy: Principles and Practice

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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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