FAT RBC Mnemonic for Causes of Macrocytic Anemia (MCV > 100) F - Folate (Fetus) and B12 Deficiency - Impairs DNA synthesis for RBC production A - Alcohol - Direct bone marrow toxicity T - Thyroid (Hypothyroidism) R - Reticulocytosis - Larger, immature RBCs released from marrow as a response to anemia B - Bone Marrow Disorders (MDS, leukemia) C - Cirrhosis, Chemicals (drugs, chemotherapy) #FAT #RBC #FATRBC #Mnemonic #Causes #Macrocytic #Anemia #Differential #Diagnosis #Hematology
