When near MedBay in The Skeld or MIRA HQ, players will hear the sound of a heart-rate monitor steadily beeping. This sound gets louder if players move towards the scanning pad.
On The Skeld, MedBay is a medium-sized room that contains a vent, a scanner, and four hospital beds. It houses two tasks, and its vent leads to the vents in Security and Electrical.
On MIRA HQ, MedBay is a medium-sized room that contains a scanner and seven futuristic hospital beds. It houses two tasks and a vent that directly leads to Locker Room and Balcony.
On Polus, MedBay is a medium-sized room that is only mentioned in the task list and the Task Tester 2000. Otherwise, it is encompassed by Laboratory. It contains a scanner and four hospital beds. The beds look like they have a table next to them. It also contains two tasks.
On The Skeld, there is a vent in the bottom-left corner of MedBay that leads to Security and Electrical. Its most common usage is traveling through a vent entered in Electrical, but entering the vent in MedBay can be useful.
On The Skeld, the top-left bed has what looks to be a folded blanket in addition to a pillow, while the others have only one pillow. This could mean one of the Crewmates at some point was ill, though it is not confirmed, and it is unknown as to who may have been ill.
On The Skeld, there is a Securitycamera outside MedBay. A Crewmate watching the cameras can easily deduce if someone is An Impostor by seeing if someone leaves but never went in or vice versa, hinting that the player entered or exited MedBay via the vent in Electrical.