Table 4.
Intra-day and inter-day precision.
| Day 1 | Day 2 | Both Days | |||||
|---|---|---|---|---|---|---|---|
| Mean (ng/mL) | SD (ng/mL) | RSD (%) | Mean (ng/mL) | SD (ng/mL) | RSD (%) | RSD (%) | |
| MC-RR | 193.0 | 10.0 | 5.2 | 208.3 | 44.7 | 21.5 | 5.4 |
| MC-YR | 31.1 | 3.4 | 10.8 | 32.7 | 6.5 | 19.9 | 3.5 |
| MC-LR | 502.7 | 22.8 | 4.5 | 682.9 | 44.0 | 6.4 | 21.5 |
| MC-FR | 271.9 | 14.5 | 5.3 | 383.0 | 43.5 | 11.4 | 24.0 |
| MC-WR | 81.6 | 16.1 | 19.7 | 127.3 | 16.9 | 13.3 | 31.0 |
| MC-RA | 73.5 | 9.4 | 12.8 | 75.8 | 13.5 | 17.8 | 2.2 |
| MC-RAba | 21.1 | 1.0 | 4.5 | 22.6 | 2.7 | 12.1 | 5.0 |
| MC-LA | 112.6 | 17.9 | 15.9 | 102.9 | 8.6 | 8.3 | 6.4 |
| MC-FA | 145.5 | 2.4 | 1.7 | 119.6 | 6.0 | 5.0 | 13.8 |
| MC-WA | 46.3 | 3.1 | 6.7 | 38.0 | 5.5 | 14.6 | 14.0 |
| MC-LAba | 89.0 | 10.2 | 11.5 | 87.4 | 6.5 | 7.4 | 1.3 |
| MC-FAba | 49.7 | 8.1 | 16.2 | 39.1 | 3.1 | 8.0 | 16.9 |
| MC-WAba | <LOQ | n.d. | n.d. | < LOQ | n.d. | n.d. | n.d. |
| MC-LF | <LOQ | n.d. | n.d. | < LOQ | n.d. | n.d. | n.d. |
| D7-LR | 10.0 | 0.0 | 0.0 | 10.0 | 0.0 | 0.0 | 0.0 |
| D5-LF | 10.0 | 0.0 | 0.0 | 10.0 | 0.0 | 0.0 | 0.0 |
Samples (n = 3) were measured on day 1. RSD is a measure for intraday precision. Identical samples were also measured on day 2 with slightly different RSD. The last column shows the RSD when the means of day 1 and day 2 are used.