At Biotest plasma center in Ohio, once you're accepted onto the Anti-D program you are considered a rh- negative donor for as long as you donate there. There is three pay level tiers as you donate regularly. You start at $90 per donation as long as you average 7-8 donations a month. If you fall below that the next tier is $75 per donation and below that is $50 per donation. You will never fall below the $50 mark. Even if you stop donating for awhile and then start back again. You'll just start at $50 and work your way back up to $90.