170
9 Managing the Quality Systems
of the measuring setup and/or reagents can be obtained. In the case of blank testing,
it is recommended to introduce the value of the analytical signal and not the concentration value calculated from the calibration curve. In that way, the use of negative
values, as well as values registered below the detectability limit, is justified. In cases
where the blank does not hold the determined component, the central line should be
at the zero level. Different placement of the central line (above zero) means that the
blank was contaminated with the determined substance.
When planning the method of quality management in a laboratory, the fact that
the CRMs might be an indispensable element of the management should be taken
into account; however, they are not the only choice. An efficient quality management system should include regular use of materials of lower order, including: RMs,
various kinds of control materials as well as homogeneous and well-characterized
samples analyzed in the given laboratory. We also cannot forget about the programs
that test the proficiency of the laboratory. Including all those elements in the systems
leads to limiting the use of CRMs, and therefore to cost reduction.
9 Managing the Quality Systems
of the measuring setup and/or reagents can be obtained. In the case of blank testing,
it is recommended to introduce the value of the analytical signal and not the concentration value calculated from the calibration curve. In that way, the use of negative
values, as well as values registered below the detectability limit, is justified. In cases
where the blank does not hold the determined component, the central line should be
at the zero level. Different placement of the central line (above zero) means that the
blank was contaminated with the determined substance.
When planning the method of quality management in a laboratory, the fact that
the CRMs might be an indispensable element of the management should be taken
into account; however, they are not the only choice. An efficient quality management system should include regular use of materials of lower order, including: RMs,
various kinds of control materials as well as homogeneous and well-characterized
samples analyzed in the given laboratory. We also cannot forget about the programs
that test the proficiency of the laboratory. Including all those elements in the systems
leads to limiting the use of CRMs, and therefore to cost reduction.