Table 1. Run Order in a Typical Analytical Batch^a.

no. of run

1

2

3–7

8

9–13

14

15–19

20

21–25

26

27–31

32

sample

B

QC1

S1–5

QC2

S6–10

QC3

S11–15

QC4

S16–20

QC5

S21–25

QC6

^aB: blank; QC: pooled quality control sample; S: study sample.