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Yes it is recommended that the cause of anemia be investigated, therefore your doctor has ordered these investigations. Please have them done. However ask your doctor about whether before colonoscopy other tests can be done such as fecal occult blood test (FOBT) and fecal immunochemical test (FIT), which are lab tests used to check stool samples for hidden (occult) blood.
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These investigations are done to find out the underlying cause for anemia, which can be bleeding ulcers in the gastrointestinal tract and these may not be malignant.
Yes it can and this is one of the most common cause.
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That is the reason that iron deficiency is not being suspected by her doctor and other causes for loss of iron are being looked for. Both ferritin and hemoglobin are moderately decreased.
Even if hemoglobin is low, it is a cause for concern and further investigations. Dietary deficiency also can cause both to be low.