Photo: The Canadian Press

Tougher iron guidelines for blood donors will almost certainly reduce collections in the short term, said a spokesman for Canadian Blood Services as the national agency appealed for more donations.

Stricter rules will force female donors to wait longer between donations and male donors will have to pass a stricter hemoglobin test.

It's all meant to promote health and wellness among donors, but the director of donor relations for Ontario said it will also reduce the amount of blood they can collect from regular patrons.

"They're very significant. It will seriously impact our collections," Michael Betel said Tuesday of the changes.

"As you can imagine, there are a lot of female donors and so it's something that we took the time to be able to implement."

Starting Dec. 10, female donors will need to wait 12 weeks between blood donations instead of the current eight-week period.

And starting March 5, 2017, male donors must have a minimum hemoglobin level of 130 grams per litre, up from 125 grams per litre.

Betel said Canadian Blood Services will need about 100,000 new donors to make up for the potential shortfall.

"The key here is we really need to get new donors. We're still at a place where only one in 60 Canadians donate blood — and one in two are eligible."

Betel said the agency has about 400,000 regular donors, with the average donor visiting twice a year. But the service also loses about 175,000 donors a year.

Hemoglobin is a protein found in red blood cells that is necessary for carrying oxygen to the tissues in the body.

Iron is an essential element for producing hemoglobin, but it is also found in other parts of the body. The blood services agency said it's possible to have normal hemoglobin levels but to have low iron.