External calibrator used for value adjustment

Mean between-assay CV (%) (SD)

None (initial concentration)

22.8 (4.6)

Both BNP-32 and glycosylated proBNP

5.6 (3.9)

BNP-32 only

31.9 (7.3)

Glycosylated proBNP only

15.5 (2.6)