What must be done to a Doppler probe before using it in a sterile field?

To ensure the proper use of a Doppler probe in a sterile field, covering it with a sterile drape is essential. This practice maintains the sterility of the probe, preventing contamination during surgical procedures. In a sterile environment, any instruments or probes that are to come into contact with sterile tissues must also be sterile to minimize the risk of infection.

Using a sterile drape not only provides a barrier from any microorganisms but also facilitates easy handling during the procedure. Other options, such as wrapping it in gauze or soaking it in antiseptic, do not effectively maintain sterility for a probe intended for precise use in surgery. Placing the probe in a sterile basin may not create the necessary sterile barrier when the probe is being used in direct contact with surgical sites. Therefore, employing a sterile drape is the best practice to ensure safety and adherence to sterile technique in the operating room.