He began donating whole blood but has now been asked to donate plasma.
"I will continue to do this for as long as I am able," he said. "It's relatively painless ... I just go up to the hospital in my lunchbreak. It only takes me about an hour."
He is one of fewer than 4 per cent of eligible Kiwis who donate blood. The Blood Service has around 110,000 blood donors on its database and about 42,000 people a year receive blood products. Every year around 28,000 drop off the donor registry.
The Blood Service has launched the Missing Type campaign in a bid to find more donors.
The campaign has been spread across 21 countries and involves participating businesses removing As and Os from places of high interest such as websites and advertising. They are hoping to find another 10,000 people who will register online to become first time donors.
Blood Service chief executive Sam Cliffe said getting younger donors was also a goal.
"If we get them at high school or school-leaving age, often they stay life-long."
The number of active donors has decreased from 128,412 in the 2011 financial year, to 109,158 last year, according to the service's annual report.
In part this reflects changes in the way blood products are used, but that does not eliminate the need for new donors to join up.