TABLE 2

Intra-assay and interassay imprecision of BNZ measurements on DBS

Nominal concn (μg · ml−1)Found mean concn (μg · ml−1)SD (μg · ml−1)RSD (%)RE (%)
Intra-assay (n = 9)
    0.05
        Day 10.0530.0035.306.05
        Day 20.0530.0024.006.67
        Day 30.0560.00611.2611.20
    0.15
        Day 10.1650.0084.7510.10
        Day 20.1570.0138.424.46
        Day 30.1720.0063.7114.87
    10.00
        Day 110.1970.3823.751.97
        Day 210.0990.3863.820.99
        Day 311.1570.1691.5111.57
    17.00
        Day 118.1420.7364.056.72
        Day 216.8900.5253.11−0.65
        Day 317.8320.1380.774.89
Interassay (n = 27)
    0.050.0540.0047,847.97
    0.150.1650.0116.929.81
    10.0010.4850.5795.534.84
    17.0017.6210.7474.243.65