I am an EMT-B working in OC/LA, California. Yesterday I had a BLS call in OC which I'm having afterthoughts about. Without going into the details, I'm trying to figure out if I missed any signs to upgrade it to ALS. I've been scouring my resources from training and the web for strict standards for BLS to ALS upgrade; things like BP cut-off ranges, specific chief complaints, etc., but I'm not having luck finding an authoritative breakdown of ALS/BLS. Is there a go-to source for these standards anywhere?