If we see or capture a suspected bed bug in a classroom, should we close the room until a Pest Management Professional inspects it?

No. If it is a bed bug, it is likely that it was unknowingly brought it into the school by someone who encountered it in another place.  If you have captured it, you may have already eliminated the problem. Additionally, many suspected bed bugs are not bed bugs at all. You should send the captured specimen to the DOE Pest Management Unit for identification by following the protocol described in the DOE’s Bed Bug Information Kit.