Variations (mean (SD)) of the cell counts performed manually and with a coulter machine in samples kept at 4°C, 24 and 48 hours (Bland and Altman method)
| 24 hours | 48 hours | Samples (n) | |
| Manual | −31% to 32% | −46% to 46% | 27 |
| Coulter | −24% to 31% | −28% to 38% | 58 |