Algorithm for diagnosis of iron deficiency anemia and ACI using clinically available tools. *In certain circumstances, patients with ferritin >100 μg/L may be responsive to iron supplementation (eg, chronic renal insufficiency and congestive heart failure). CHr, reticulocyte corpuscular hemoglobin; F, female; HYPO%, percent hypochromic red blood cells; M, male; sTfR1, soluble transferrin receptor 1; Tf sat, transferrin saturation.