Regina, I was trying to find one of the recent threads where we listed questions to ask and haven't yet. Basically, what is your approach to helping out (who shows up to do what), what is the philosophy and practice around the end of life (is it "stop measuring morphine" on request, or still regimented, for example, and how closely they will work with you, the CALS, vs. their own protocols), if there is a religious component, does it mesh with yours, etc. And of course if the Trilogy is supported when used non-invasively.
I would test their ALS knowledge and comfort level. Whether by asking or stating, they should know that supplemental oxygen in ALS generally shortens life since it accelerates CO2 retention, but is sometimes used palliatively.
It is really about your comfort with them as with any health professional. You don't have to articulate everything as much as listen/watch. If the person they send to explain their services is not a clinical professional, that's a red flag, too.
Generally, not-for-profit hospices are best. And there is a
database with federal information to compare them.