Table 2.
Discrimination indices for differential between βTT (n = 537) and IDA (n = 370) in patients with microcytic anemia.
| Discriminant Formula | Reference | Calculation | Cut–off βTT | Cut–off IDA |
|---|---|---|---|---|
| England and Fraser (E&F) | 19 | MCV − RBC − (5 HB) − 3.4 | <0 | >0 |
| RBC | 20 | RBC | >5 | <5 |
| Mentzer | 21 | MCV/RBC | <13 | >13 |
| Srivastava | 22 | MCH/RBC | <3.8 | >3.8 |
| Shine and Lal (S&L) | 23 | MCV × MCH × 0/01 | <1530 | >1530 |
| Bessman | 24 | RDW | <14 | >14 |
| Ricerca | 25 | RDW/RBC | <4.4 | >4.4 |
| Green and King (G&K) | 26 | (MCV2 × RDW)/(100 HB) | <65 | >65 |
| Das Gupta | 27 | 1.89 RBC − 0.33 RDW − 3.28 | >0 | <0 |
| Jayabose (RDWI) | 28 | (MCV × RDW)/RBC | <220 | >220 |
| Telmissani – MCHD | 29 | MCH/MCV | <0.34 | >0.34 |
| Telmissani – MDHL | 29 | (MCH × RBC)/MCV | >1.75 | <1.75 |
| Huber– Herklotz | 30 | (MCH × RDW/10 RBC) + RDW | <20 | >20 |
| Kerman I | 31 | (MCV × MCH)/RBC | <300 | 300–400 |
| Kerman II | 31 | (MCV × MCH × 10)/(RBC × MCHC) | <85 | 85–105 |
| Sirdah | 32 | MCV − RBC − (3 Hb) | <27 | >27 |
| Ehsani | 33 | MCV − (10 RBC) | <15 | >15 |
| Keikhaei | 34 | (HB × RDW × 100)/(RBC2 × MCHC) | <21 | >21 |
| Nishad | 35 | 0.615 MCV + 0.518 MCH + 0.446 RDW | <59 | >59 |
| Wongprachum | 36 | (MCV × RDW/RBC) – 10 HB | <104 | >104 |
| Sehgal | 37 | MCV2/RBC | <972 | >972 |
| Pornprasert | 38 | MCHC | <31 | >31 |
| Sirachainan | 39 | 1.5 HB – 0.05 MCV | >14 | <14 |
| Bordbar | 40 | |80−MCV| × |27−MCH| | >44.76 | <44.76 |
| Matos and Carvalho (MC) | 64 | 1.91 RBC + 0.44 MCHC | >23.85 | <23.85 |
| Janel (11 T) | 41 | Combination of RBC, Mentzer, S&L, E&F, Srivastava, G&K, RDW, RDWI, Ricerca, Ehsani and Sirdah | ≥8 | <8 |
| CRUISE | MCHC + 0.603 RBC + 0.523 RDW | ≥ 42.63 | <42.63 | |
| Index26 | Combination of all indices except Janel (11 T) index | ≥ 16 | <16 | |