In patients with lower respiratory tract infections,<unk>  guided antibiotic stewardship didn't result in worse outcomes, but did reduce antibiotic exposure and their associated effects<unk> -guided approach to inform antibiotic therapy didn't result in decreased antibiotic use compared to usual care
Procalcitonin
Calcitonin
Brain natriuretic peptide
Troponin
ACTH 
Beta-HCG
Zoledronate
D-dimer