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There were 31,000 fewer donors than before the COVID-19 pandemic, meaning more pressure on a smaller number of people willing to roll up their sleeves.

"We've certainly seen the donor base in the last several quarters slowly inch up again. I think about 80 per cent of that target has been met," said ºÃÉ«tv Blood Services CEO Dr. Graham Sher.

"The facts are we have been able to meet patient needs consistently. We've delivered all the product to hospitals … but we're going to the well too many times (with) the same donors."

The service oversees the inventory from which blood and blood products are regularly shifted around the country to meet hospital and patient needs.

Between 400,000 and 425,000 ºÃÉ«tvs give blood on a regular basis.

But inventory has a shelf life — a year for frozen plasma, 42 days for red blood cells and five days for platelets — so it takes some work to ensure supply continues to meet demand.

"Supplies are tight. We like to have 21,000 to 25,000 units of blood in inventory on any given day, because that gives us the agility and elasticity to meet the needs right across the country," Sher said.

"We're operating with an inventory of 15,000 to 16,000 units rather than the 21,000. That is why we're saying we need to build the donor base and increase the collections."

ºÃÉ«tv Blood Services has 25,000 empty appointments to fill before the end of the busy Christmas and New Year periods. It is also dealing with a large number of cancellations or people simply not showing up due to a combination of colds, flu and COVID-19 illnesses.

"Winter cold and flu season is upon us, our cancellation rates have jumped significantly and we're heading into the toughest weeks to collect blood and blood products," said Rick Prinzen, the chief supply chain officer and vice-president of donor relations for ºÃÉ«tv Blood Services.

"Winter storms could further impact collections."

This report by ºÃÉ«tvwas first published Dec.13, 2022.

— By Bill Graveland in Calgary