Ability of ferritin, sTfR, TfR-F index and MCHC to identify children with deficiency of iron stores based on new cut-off values
| Original cut-off | New cut-off | % change in cut-off | Sensitivity* | Specificity* | Accuracy* | |
| Ferritin | 30 μg/l | 273 μg/l | 810 | 75 | 76 | 76 |
| sTfR | 8.3 μg/ml | 15.2 μg/ml | 83 | 77 | 76 | 76 |
| TfR-F index | 5.6 | 5.3 | −5 | 74 | 73 | 73 |
| MCHC | 32.0 g/l | 32.1 g/l | 0.3 | 67 | 64 | 65 |
*Sensitivity, specificity or accuracy of new cut-off.
MCHC, mean cell haemoglobin concentration; sTfR, soluble transferrin receptor; TfR-F index, transferrin-ferritin index.