Table 1.

Between day precision and accuracy for calibrators and three different batches of QC samples. Data were collected from a replication experiment in which each sample was run in duplicate on a different day (n = 5–9). Concentrations of Aβ₄₂ for QC samples lot#242 and 142 were obtained from the calibration curve prepared from standard material lot# 942

Calibrator (pg/mL) lot#942		Mean accuracy (%)	Mean SD	Mean CV (%)	n
Nominal	Reads
50	49.9	99.7	10.7	10.8	18
100	105.1	105.1	7.9	7.4	18
200	200.9	100.4	6.7	6.6	18
350	345.3	98.6	5.5	5.6	18
500	482.5	96.5	4.7	4.8	18
750	738.2	98.4	7.2	7.3	18
1000	1003.5	100.4	6.2	6.1	18
3000	3019.5	100.6	2.7	2.6	18
QC samples lot#942
250	255.6	102.2	24.9	9.7	14
400	404.7	101.2	33.3	8.2	14
800	793.6	99.2	50.7	6.4	14
QC samples lot#242
250	238.2	95.8	22.0	9.2	10
400	366.8	91.7	19.1	5.2	10
800	782.1	97.8	79.3	10.1	10
QC samples lot#142
250	249.0	99.6	24.2	9.7	10
400	402.4	100.6	29.8	7.4	10
800	770.4	96.3	62.7	8.1	10