Table 2 Suggested acceptable levels of precision.

Method	Acceptable precision (between‐batch coefficient of variation, %)
Turbidimetry	3–5
Nephelometry	3–5
ELISA	8–12
Radioimmunoassay	8–12
Radial immunodiffusion	10–20
Rocket electrophoresis	10–20

ELISA, enzyme‐linked immunosorbent assay.