Canadian Blood Services is asking donors to make an extra effort soon to help overcome a low supply that was worsened by last week's blizzard.

The blizzard, which brought much of eastern and central Newfoundland to a standstill on Friday, forced the cancellation of three clinics.

Paul McGrath, the national manager of public affairs for Canadian Blood Services, said the disruption has meant a further dent in supplies, which are typically lower anyway after Christmas.

"We really need a strong recovery this week," McGrath said.

The cancelled clinics meant that about 150 expected units were not collected. To put that in perspective, McGrath said that a typical victim in a motor vehicle accident would need as much as 50 units.

"So 50 Newfoundlanders and Labradorians would need to donate blood for just that one patient," he said.

Regular clinics are operating this week in St. John's, Corner Brook and Grand Falls-Windsor.

Additionally, clinics are also operating this week in Bay Roberts, Carbonear and the St. John's area.

Potential donors can call the toll-free Blood Services number at 1-888-2-DONATE, or 1-888-236-6283.