just to supplement Mark's post:
To get the LCT you can use as already mentioned lct_admin:
select lct_admin('lastchance', db_id)
The db_id you get for example from sp_helpdb.
If lct_admin(“lastchance”, dbid) returns zero, the log is not on a separate segment in this database, so no last-chance threshold exists.
Regards,
Jens