GE Versana Essential Technical Publication page 275

Sterile Ultrasound Procedures
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Versana Essential
5759238-100 English Rev. 2
ONLY ultrasound gel that is labeled as sterile, is sterile.
Ensure you always use sterile ultrasound gel for those
procedures that require sterile ultrasound gel.
Once a container of sterile ultrasound gel is opened, it is no
longer sterile and contamination during subsequent use is
possible.
User Guide
Probe Overview
5-19