Riverina residents are being asked to roll up a sleeve and make a blood donation.
As the devastating bushfires continue to burn across NSW and Queensland, the Australian Red Cross Blood Service has been forced to close its donor centres at Taree, Coffs Harbour and Port Macquarie, and a pop-up centre at Byron Bay.
Blood Service spokeswoman Helen Walsh said the service was looking to the rest of the country to help fill the gaps and ensure blood supplies stay strong.
"Given the unpredictability of the fires, the reality is we're unlikely to immediately know the full impact on donations until later in the week. We do know that we collect around 15 per cent of blood supplies for NSW in the areas where we have had to close our centres.
"In addition to the blood centre closures and with catastrophic fire warnings in place for much of the east coast, we are expecting to see an increase in donors needing to cancel their appointments at our Maitland, Newcastle and Gosford centres at a minimum.
"With blood being a critical resource, we simply cannot afford to take a wait and watch approach and are calling for donors to please roll up their sleeves, now, in order to bolster the nation's blood stocks."
Cathy Chapman from the Red Cross's Riverina and Hume region, said there were still donation appointments available at the Wagga donor centre in Berry Street.
She urged anyone wanting to make a donation to book a time by phoning 13 14 95 or at the website.