Whilst have a routine blood draw at a Douglas Hanley Moir facility I casually asked the phlebotomist if they also do TB testing.
"Oh yes" she replied
"Do you use Quantiferon" I innocently asked
"Oh yes, Quantiferon Gold" she enthusiastically replied
"Is the usage increasing..?"
"Oh yes, it has become much more frequent"
I think I then pushed my luck when I asked her by how much - she was supposed to be doing the extracting not me.
"Have a nice day.."