It's just standard vaccinations and checkups, if it was some sort of crisis, Julian would be there til the bitter end. But he's not strictly needed right now--this takes precedence, before one of them slips up.

"Despite having a roommate, he's not even from this reality, so even if he's about he'll have no idea what we're discussing. It's more private than Ten Forward, at least."

He leads Jadzia out of Sickbay with a nod to the security staff, then to the turbolift.