37
Standards & Quality Control
dure section. 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 neces-
sary.
3. Repeatability tips are specified in the previous chapter. It depends
to a certain extent upon operator technique and can usually be
improved by carefully following the suggestions in the repeatability
tips section.
4. Instrument accuracy is determined by comparing your results on
precisely-known standards and/or controls with their specified val-
ues. The instrument accuracy is adjustable; if it is unsatisfactory, it
should be corrected by recalibrating, as instructed in the next chap-
ter. However, it has been shown that frequent unnecessary recali-
bration 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 regu-
latory bodies.
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