A %RSD of

%RSD (Relative Standard Deviation) is a key metric in precision analysis, with acceptable values typically ≤ 2% for intra-day and ≤ 3% for inter-day precision, as outlined by AOAC and ISO standards. These guidelines are crucial for ensuring reliability in analytical method validation, particularly in pharmaceutical assays and quality control processes.

You can find this information "HORWITZ EQUATION AS QUALITY BENCHMARK IN ISO / IEC 17025 TESTING LABORATORY" for reference.