American companies will be testing the use of drones to deliver blood and medications during medical emergencies to remote areas.

A drone can be used to deliver blood immediately from a blood bank as soon as a call is received. This would allow hospitals to avoid keeping large amounts of blood in stock, in turn reducing the overall demand.
Drones are cheaper to use for deliveries compared to helicopters. Mayo clinic’s helicopters make 400 flights per year delivering blood and plasma, each costing thousands of dollars, while drones can be used to deliver blood and plasma for pennies in the near future.
Source-Medindia