Intravenous forms of vitamin B12 are typically given in the case of severe deficiency or pernicious anemia
A deficiency in these vitamins can contribute to fatigue
So, the tests you will be asked to get done are- a complete blood count to check if you have any type of anaemia, reticulocyte count to see how many new blood cells are being made in the body, serum bilirubin levels which tell how many cells are being lost as bilirubin is a byproduct of blood cell breakdown and checking amounts of homocysteine and methylmalonic acid higher values of which confirm B12 deficiency
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