What is the best way to reduce human error in manual sample prep?

The best way to reduce human error in manual sample prep is to standardize repetitive, error-prone steps such as pipetting, serial dilutions, reagent transfers, plate setup, and sample normalization. Standardized operating procedures (SOPs), training, calibrated pipettes, standardized labware, and consistent tube or plate handling practices all help. 

Benchtop automation can further reduce error by running defined sample prep steps the same way every time, improving consistency and reproducibility across users and runs.