A total measurement cycle took 11 min, permitting duplicate analysis of 3 samples per hour.
Method imprecision (between-run coefficients of variation [CVs] from duplicate analysis of three quality control [QC] urine pools across 20 runs) was 5.6 12% for ESI, as opposed to 5.3 30% for APCI.
Analytical reproducibility determined by duplicate analysis of 12 random samples revealed good assay consistency for all three analysed antigens, with day to day variation in normal subjects being relatively minor in significance.
Duplicate analysis was carried out.
Duplicate analysis of 12 mouse urine samples showed good reproducibility (CV 6% within assays).
Here again, criteria 1 4 can be distinguished (see "Task 1.1: summary of glossary-internal term duplicate analysis" section) so that the plan of action, shown in Table 8, results by classification of each term-based entry group.
This duplicate analysis was necessary because Despite what officials described as an extraordinarily concentrated collection effort leading up to the operation, no U.S. spy agency was ever able to capture a photograph of bin Laden at the compound before the raid or a recording of the voice of the mysterious male figure whose family occupied the structure's top two floors.
Furthermore, method performance was carefully monitored using multiple internal standards (5 to 10 depending on method, including analogues, 2H and 13C labeled metabolites) and duplicate analysis of samples.
An automatic duplicate analysis was performed.
Samples were assayed by duplicate analysis in duplicate wells.
Values are expressed as means of duplicate analysis ± SD.
