peach here. do not know where to post this but here goes: cannot find much information on the internet for "black blood" all i can find is low oxygen in the blood. wouldn't the veins and the valves be involved as well? there has not been any investigation into this or i cannot find it, the last 2 blood draws (on 2 different arms) were black. even the phlebotomist remarked on this. i know i have severe anemia. very low b-12. it is good to keep up with the health issues. ???? any help will be greatly appreciated and thank you.