Patients need round-the-clock care; therefore working hours include days, nights, weekends, and holidays. Clinical / Technical laboratory staff spends a considerable amount of time walking, bending, stretching and standing; therefore, they must follow proper body mechanics to guard against injury. Clinical / Technical laboratory staff must be able to work accurately around frequent interruptions. Lab staff frequently faces hazards from exposure to chemicals and infectious diseases and must be prepared for such instances and take proper precautions at all times. In addition, lab staff may have to collect blood samples from patients that may be confused, irrational, agitated, and/or uncooperative.