Table 1.

Within-run and total imprecision using the CLSI standard EP5A2.

Siemens EMIT® MPA controls			Within-run		Total
IQC levels	Days	Mean (mg/L)	CV (%)	95% CI	CV (%)	95% CI
1	20	1.2	5.5	4.5–6.9	9.3	7.4–11.3
2	20	9.3	1.2	1.0–1.6	4.1	2.9–5.3
3	20	14.1	1.5	1.2–1.9	2.5	1.8–3.2

Roche Total MPA controls			Within-run		Total
IQC levels	Days	Mean (mg/L)	CV (%)	95% CI	CV (%)	95% CI
1	20	0.8	4.3	3.5–5.5	9.7	8.0–12.1
2	20	3.5	1.3	1.1–1.6	2.5	2.1–3.1
3	20	12.6	1.9	1.6–2.5	2.9	2.4–3.5