How to check if sidebars are loaded?

Hi.
How do I add a check to see if sidebars are loaded? I’d then like to load them conditionally if they’re not loaded, to stay consistent with the theme I’m using.
This is an issue with a specific theme I’m using where the visitors can click a permalink to view an activity entry written throuh a buddypress function, but I would think adding syntax to check for sidebars is independent of buddypress.