09/30/2014 12:02 EDT | Updated 11/30/2014 05:59 EST

Canadian Blood Services urges donations as supply 'critically low'

Canadian Blood Services is urging Canadians to make a donation as the country's blood supply is "critically low."

Fewer donations over the past few months has created the lowest blood supply since 2008. All blood types are required, but especially types A and O.  

“Without the help of Canadians we may have difficulty meeting the expected hospital demand across the country. For patients, this may mean deferring elective or routine treatments,” said spokesman Mark Donnison in a press release Tuesday.

To meet hospital demands, Canadian Blood Services regularly collects 17,000 units of blood per week.