Is B12 Macro or Microcytic Anemia? Understanding Your Blood Test Results
                                
                                
                                •
                                
                                
                        
                                    
                                    2 min read                                
                            
                                According to the National Institutes of Health, vitamin B12 deficiency is a significant cause of megaloblastic anemia, a type of macrocytic anemia. Therefore, B12 deficiency causes macrocytic anemia, characterized by abnormally large red blood cells.