Vitamin B12 is one of the most important nutrients in the body that contributes to the health of your nerve cells and blood. B12 also helps in DNA production and hence it is important to keep the levels of B12 in check. When you undergo vitamin B12 test in Vadodara, a professional phlebotomist will take your blood sample at home and get it tested in the lab. However, it is always recommended to follow the doctor’s instructions and guidance.