1. Selection of paternity testing agency Choosing a reliable and professional paternity testing agency is a key step. First of all, you should choose those institutions that have passed ISO9001 quality management certification. Because these institutions have the standardization of process flow and the stability of product quality. Secondly, you should choose an institution with professional identification technology and advanced identification equipment. First-class appraisal institutions will use a variety of advanced analytical instruments and technologies during the appraisal process to ensure the reliability of the appraisal results.