Should I have my blood tested for levels of certain vitamins and minerals if I have gastritis?
If you have a gastrointestinal disease that leads to significant malabsorption (poor absorption of vitamins and nutrients by the intestine), your doctor may measure the levels of certain vitamins and minerals in your blood. Atrophic gastritis, for example, is a condition that specifically leads to the malabsorption of vitamin B12. This vitamin can be measured in your blood.
If your routine laboratory tests (including a complete blood count and a chemistry panel) are normal, you do not need a measurement of your blood vitamin or mineral levels.
If you are found to be anemic and your doctor believes it is a result of a nutrient deficiency, he or she may measure the level of iron in your blood. Iron, in fact, is the only mineral for which blood levels are linked to the total amount of iron that is stored in your body.