Your husband is a great man for donating blood. I agree, type O negative is extremely rare. My GF is a nurse and they treat this type as a celebrity.
Thank you- they can’t believe how fast the blood just fills a bag or two. He is just in and out in no time. He enjoys doing it.
I tried one time at work to donate. They put the needle in and I watched many people come and go; I am still squeezing my hand, trying to fill the bag. After an hour or more I asked the nurse, what is wrong, I am still here and the bag is not even half full. She checked and said Oh my, you have very small veins. Next time you donate tell them you need a butterfly type needle. I never gave again. Kudos to folks who donate.