I work in a 28 bed hospital. The OB nurses float to m/s when there is no patient. They can be low censused, but no one is allowed to clock in and just sit. We used to have OB nurses just on call, the charge nurse would check the pt then call the OB nurse when the pat was dialated to 5 or more. Yikes! Not for me, I work ICU. It is nice to have scheduled OB nurses, and yes, they are expected to work the floor. Cross contamination can be prevented with good hand washing and extra scrubs for when they get an expectant mom in.