Vitamin B12 test helps to detect deficiencies and diagnose the cause of certain anemias, such as pernicious anemia, an autoimmune disease that affects the absorption of B12. This test determines the level of vitamin B12 in the blood present in the form of liquid (serum or plasma).
Vitamin B12 is the part of the B complex of vitamins. Along with Vitamin B 12, folate is another important vitamin and both are necessary for the formation of red blood cells, synthesis of DNA and repair of tissues and cells.
The level of Vitamin B12 is also important for the nervous system as its deficiency can lead to neuropathy which is a form of nerve damage and brain problems.
Besides that, one needs to fulfill the requirement of enough Vitamin B12 in their body through diet and supplements as well.