Canadian Blood Services (CBS) says blood donors across the country are needed daily, but especially before the Easter long weekend.
Over 7,000 appointments in Canada have to be filled before April 10 to restock supplies in blood, platelets and plasma in order to meet patients' needs. Waterloo Region blood donors are being asked to fill 300 of those appointments.
While all blood types are requested, CBS said there is a "greater need" for O-negative.
"O-negative blood donors are especially needed because this blood type can be transfused to any patient. In times of emergency or for newborn patients, O-negative blood, the universal blood type, makes a lifesaving difference."
Blood donations are needed daily for cancer patients, accident victims, and people with immunodeficiency, autoimmune and neurological disorders.
Those looking to donate in Waterloo Region can do so at 94 Bridgeport Road East in Waterloo.
While appointments are required, same-day bookings are available daily at many donor centres and community events in Canada.
To book an appointment in Waterloo or at another location, visit here, use the GiveBlood app or call 1-888-2-Donate.
Those unable to attend an appointment are asked to rebook for the following month or cancel the appointment so that someone can take the time slot.