> For the complete documentation index, see [llms.txt](https://docs.snomed.org/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.snomed.org/snomed-ct-specifications/snomed-ct-editorial-guide/readme/authoring/domain-specific-modeling/procedure/index-1/index/ultrasonography.md).

# Ultrasonography

## Ultrasonography

* FSN: Ultrasonography of X (procedure)
* PT: Ultrasonography of X
* SYN: Ultrasound scan of X
* SYN: Ultrasound of X
  * For example,
    * 709590000 | Ultrasonography of perineum (procedure)|
      * FSN: Ultrasonography of perineum (procedure)
      * PT: Ultrasonography of perineum
      * SYN: Ultrasound scan of perineum
      * SYN: Ultrasound of perineum

## Doppler ultrasonography

* FSN: Doppler ultrasonography of X (procedure)
* PT: Doppler ultrasonography of X
* SYN: Doppler ultrasound scan of X
  * For example,
    * 710306004 | Doppler ultrasonography of venous structure (procedure)|
      * FSN: Doppler ultrasonography of venous structure (procedure)
      * PT: Doppler ultrasonography of vein
      * SYN: Doppler ultrasound scan of vein

## Obstetric ultrasonography

An obstetric ultrasound may require a complex description. However, the same rules apply, as follows:

* FSN: Obstetric ultrasonography of X (procedure)
* PT: Obstetric ultrasonography of X
* SYN: Obstetric ultrasound scan of X
* SYN: Obstetric ultrasound of X
  * For example,
    * 169670003 | Antenatal ultrasound scan at 17-22 weeks (procedure)|
      * FSN: Antenatal ultrasound scan at 17-22 weeks (procedure)
      * PT: Antenatal ultrasound scan at 17-22 weeks

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