Solr query for a profile field that is multiple select

Looking for direction on how to properly send a Solr query to filter based on profile field values of a type that is multi-select checkbox.  Simply using profile_HFProfession:Audiologist is not returning any results, when I know I have people in the database with that set.  Would like to send a query to Solr like this:  profile_State:MN && profile_HFProfession:Audiologist