I actual hope Laura already knows Lucky isn't a match.
I was looking up Lulu's blood type - apparently it's A- which is fairly rare (about 6-8% of the population). So yeah, she'd have a harder time finding a donor, but not impossible. I'm curious - have they mentioned her being on the transplant list for a deceased donor as well? They're all talking living donors like it's the only option.
So this means Lucky has to be A-, as well as Nikolas. Which means when Lulu donated blood to Aidan, she donated Nikolas's blood *technically* because of the transplant. Have they tested Aidan??
Does GH have a medical consultant? Because they should.