Anemia

Hemolytic anemia - AIHA, G6PD, infection

Macrocytic anemia - folate, vit b12

Pernicious anemia 

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Iron intepretation 

Ferritin < 30 is considred iron deficiency anemia 

Threshold for iron infusion : iron sat < 20%, Ferritin with ferritin 100-300 - to give iron ferinject in HFrEF and CKD