Final answer:
Ferritin is decreased in IDA (Iron Deficiency Anemia) compared to AOI (Anemia of Inflammation) or ACD (Anemia of Chronic Disease).
Step-by-step explanation:
Ferritin is decreased in IDA (Iron Deficiency Anemia) compared to AOI (Anemia of Inflammation) or ACD (Anemia of Chronic Disease). Ferritin is a protein that stores iron in the body. In IDA, there is a lack of iron, so the levels of ferritin are low. In AOI or ACD, there is inflammation in the body, which can increase ferritin levels.