to effect quality control in the pulmonary function laboratory one should ( 1 ) ensure that procedures and software conform to standards , ( 2 ) follow routine calibration-check procedures , ( 3 ) check test results for internal consistency and for consistency with other test results , ( 4 ) conduct periodic testing of a quality-control subject or reference sample , ( 5 ) continually evaluate software performance , ( 6 ) carefully evaluate changes in instrumentation and software , and ( 7 ) maintain duplicate copies of data on different types of mass storage media .
C0184661
procedures
C0220825
evaluate