Serum transferrin receptor-ferritin index in anemic patients with iron deficiency, anemia of chronic disease/anemia of inflammation, or both

This figure shows the serum (also called soluble) transferrin receptor-ferritin index (sTfR-F index), the ratio of the serum TfR to the logarithm (base 10) of the serum ferritin in IDA (red circles), ACD/AI (green squares), and those with both conditions (IDA + ACD/AI; blue triangles). Median values are indicated by the horizontal bars. A value of ≤1.0 suggests ACD, while values ≥2 suggest IDA or IDA + ACD/AI.