英文版 Batch sizes for determination should be adjusted so that detector response to a single injection of bracketing calibration standards does not drift >20% at ≥2 x LCL, or >30% at 1–2 x LCL (if the LCL is close to the LOQ). If the drift exceeds these values, repeat of determinations is not necessary where the samples clearly contain no analyte, providing that the response at the calibration level corresponding with the reporting level (RL) remains measurable throughout the batch.