This test is normally used to evaluate the amount of B12 vitamin in blood and is generally carried out side by side with estimation of folate in the blood. It is highly recommended when symptoms of anemia are present as in most cases it is directly involved in underlying causes of anemia. Vitamin B12 carry out many functions in the body, including formation of RBCs, repair of cells and synthesis of DNA. The clinical symptoms that are related to this test include fatigue, weakness of muscles, pale skin, dizziness, rapid heart rate and shortness of breath.
LabEspy recommends Lab Testing API, Walk-In Lab, Ulta Lab Tests for this test.