Quality control samples are special specimens inserted into the testing process and treated as if they were patient samples by being exposed to the same operating conditions. The purpose of including quality control samples in analytical runs is to evaluate the reliability of a method by assaying a stable material that resembles patient samples. Quality control is a measure of precision or how well the measurement system reproduces the same result over time and under varying operating conditions. Pathologists need to be involved in development of quality control protocols, the selection of quality control materials, long term review of quality control data, and decisions about repeating patient samples after large runs are rejected. These quality control activities play an important part in assuring the quality of laboratory tests. Quality control material is usually run at the beginning of each shift, after an instrument is serviced, when reagent lots are changed, after calibration, and when patient results seem inappropriate.
Quality control is a necessary function of business operations. Companies may select from a variety of quality control methods to solve any problem, or potential problem. Most quality control problem solving methods are designed to prevent quality control problems or reduce the negative impact of quality control problems. Other quality control problems may largely be reactionary. Elements of different methods may overlap with other methods. The quality assurance method prevents quality problems and isolates the problem quickly.
Or do you call to mind glassy-eyed, empty-headed teenagers sitting before computer screens, consumed by video games and social networking sites, even as their counterparts in China prepare to ace yet another round of academic exams? Divergent though they are, these characterizations share a common emphasis: homework. The studying that middle school and high school students do after the dismissal bell rings is either an unreasonable burden or a crucial activity that needs beefing up.
Other times, I received more hostile responses. I used to go to great lengths to defend my homework assignments. Death, taxes, homework.