Receiving, labeling and analyzing samples (blood, toxic, tissue etc.) Designing and executing laboratory testing according standard procedures. Conducting experiments under defined conditions to verify/reject various types of hypotheses using refined scientific methods. A lab technician is a scientific and technical worker who assists scientists in laboratories. This often involves work with complex systems to help the functioning of scientific processes and projects, to record the results appropriately, and to aid in the routine procedures that take place in a laboratory.