As of May 31, there were 2416 active donors in Northland - people who have given blood in the past two years.
The number of donors has been decreasing - in 2014 there were 3146 - but this year's figure is up on last year's 2193.
Each person donates an average of 470ml which is separated into red blood cells, platelets, blood clotting factors, plasma, anti-D, immunoglobin, globulins and several pharmaceutical components.
About 2.75 per cent of the processed blood goes to Whangarei Hospital's blood bank. That works out to about 3086 units of donated blood in the past year.
The Blood Service also oversees accreditation of blood taking and testing, and blood banking at hospitals. In those hospital labs, blood products are tested pre-transfusion and matched to each individual patient.
People can register to be a donor by calling 0800 448325 or at www.nzblood.co.nz.