E. Quality control implementation
The following recommendations outline the minimum requirements
for quality control:
1. Read, understand and follow the instructions and recommenda-
tions in this user’s guide as closely as practical.
2. The instrument repeatability and accuracy should be checked
each time it is used, as recommended in Chapter 2. Run at least
two levels of standards or controls daily. Prepare, maintain and
follow additional verification procedures specifically adapted to
your own laboratory requirements as necessary.
3. Instrument repeatability is specified in Appendix B. It depends
to a certain extent upon operator technique and can usually be
improved by carefully following the suggestions in Chapter 2.
4. Instrument accuracy is determined by comparing your results on
precisely-known standards and/or controls with their specified
values. The instrument accuracy is adjustable; if it is unsatis-
factory, it should be corrected by re-calibrating, as instructed in
Chapter 4. However, do not re-calibrate when the calibration is
satisfactory. It has been shown that unnecessary re-calibration
will introduce inaccuracy. The calibration of a freezing point
cryoscope in good condition and properly operated will not shift
or drift.
5. Follow quality control requirements of your associations and
regulatory bodies.
45
Standards & Quality Control
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