The Vitamin B12 Test is a serological test used to measure the levels of vitamin B12 in your blood. Your body needs Vitamin B12 to make blood cells and ensure the proper functioning of the brain and nervous system. Vitamin B12 deficiency results in the reduction of red blood cells, which is known as pernicious anemia or megaloblastic anemia. Vitamin B12 is a water-soluble vitamin needed by your body to keep your blood and nerve cells healthy. Vitamin B12 also helps make the genetic material in your cells known as DNA. The Vitamin B12 Test is prescribed as a diagnostic test for macrocytic anemia and megaloblastic anemia or pernicious anemia. For people whose regular reports show signs of these types of anemias, the Vitamin B12 Test helps confirm the diagnosis. Pernicious anemia or megaloblastic anemia may be caused due to poor absorption of vitamin B12 from your intestines. Macrocytic anemia is a condition where your body’s red blood cells are overly large and there is a decrease in the total number of normal red blood cells. Studies show that vitamin B12 deficiency is an endemic condition in Indians. 47% of Indians suffer from this deficiency. To manage your daily requirement of vitamin B12 levels, you can include meats, dairy and seafood in your diet. For example, eat more liver, pork, beef, fortified soymilk, fish, chicken, poultry and dairy products like milk, yoghurt and cheese. These foods will help maintain your body’s daily requirement of vitamin B12. The Vitamin B12 Test is done by taking your blood sample. You can get this test done along with your regular tests or as a single blood test.