It is world's most rare blood type ... people with Rh-null blood lack these Rh antigens, giving the blood a slightly yellow color. The proteins known as Rhesus (Rh) factors or antigens are ...

If you've ever searched the internet for the rarest blood type, you may have come up with more questions than answers. The short answer: AB negative is the rarest of the eight main blood types. Less ...

These color changes are typically permanent, and patients with argyria may experience psychological distress because of their appearance. Symptoms can vary depending on how much silver enters a ...

If it is absent, your blood group is RhD negative. Lesson plan: Blood testing for beginners AB negative is the rarest blood group. O positive is the most common, but O negative is the most safely ...