The American Red Cross has raised the alert on its blood supply to "critical" -- the last step before "emergency."
Officials are blaming flu and bad weather for keeping donors at home, but some researchers also point to changes in the blood economy.
To keep up with normal demand, the Red Cross has to collect 372 units of blood in Massachusetts every day.
But this season they’re falling short, said Red Cross spokesperson Kelly Isenor.
In the past month, the organization has canceled 28 blood drives in the state, which equals about 750 donations.