Learn what different shades of blood mean and how they signal changes in your health or potential medical issues.

Red blood cells look similar to disks. They don’t have nuclei, are circular and flat-shaped, and are concave on both sides. This makes it easy for transporting and the functioning of the cells ...

An MCV test can help diagnose several conditions, especially anemia—when your body does not have enough healthy red blood cells ... A healthcare provider can look at the results of other ...

Black blood can sometimes also indicate a blockage inside a person’s vagina. Other symptoms of a vaginal blockage can include: Like black blood, brown or dark red is a sign of old blood and may ...