* A complete blood count can reveal microcytic anemia, although this is not always presenteven when<unk>  progresses to<unk>  anemia. * Low serum ferritin (see below) * Low serum iron * High TIBC (total iron binding capacity), although this can be elevated in cases of anemia of chronic inflammation. * It is possible that the fecal occult blood test might be positive, if<unk>  is the result of gastrointestinal bleeding; although the sensitivity of the test may mean that in some cases it will be negative even with enteral blood loss. As always, laboratory values have to be interpreted with the lab's reference values in mind and considering all aspects of the individual clinical situation. Serum ferritin can be elevated in inflammatory conditions; so a normal serum ferritin may not always exclude<unk> , and the utility is improved by taking a concurrent C-reactive protein (CRP). The level of serum ferritin that is viewed as "high" depends on the condition. For example, in inflammatory bowel disease the threshold is 100, where as in chronic heart failure (CHF) the levels are 200.
Iron deficiency
Zinc deficiency
Zinc toxicity
Manganese deficiency 
Iron metabolism disorder
Folate deficiency
Copper deficiency
Cerebral folate deficiency