|PROFICIENCY TESTING (PT) SCHEMESProficiency Testing (PT) schemes and QA systems
The special advantages of PT-schemes organized by iis
A typical PT-scheme report
This years program
Tailor made PT-schemes
New PT-schemes and ideas
Statistical procedure as used by iis
Testing (PT) Schemes and QA systems
proficiency tests (laboratory evaluating interlaboratory tests) is considered mandatory
for laboratories accredited according to ISO/IEC 17025 and EN 45003. Checking
analyses results with those of other laboratories is an important third line quality
control element. Corrective actions may be taken if the results deviate systematically.
If a laboratory
participates in PT evaluations, clients of the laboratory find a better guarantee that the
results remain their integrity when the sample is tested again by other laboratories.
is the use of interlaboratory study to determine the performance of individual
laboratories for specific tests and to monitor laboratories' continuing performance.
Participating in PT-schemes provides laboratories with an objective means of
assessing and demonstrating the reliability of the data they are producing"
(quoted from ISO Guide 43)
a laboratory consistently produces reliable results is of major importance to the
laboratory itself and the organization it belongs to. Also (potential) customers and
accreditation or regulatory bodies are very interested.
special advantages of
PT-schemes organized by iisiis participants are
allowed to use their own methods of analysis
iis reports back in two
iis programs are truly
iis participants truly
represent all industries
iis maintains an ISO/IEC
17043 quality system
iis tariffs are
iis reports comment on
results, methodologies, trends
iis treats all data
typical PT-scheme report
The Institute for
Interlaboratory Studies writes a comprehensive report for each study. Many participants
have interest in the background of the samples, the statistical
details, the detailed results and comments on the test results. The reports also
contain a summary for executives.
The iis reports can be
obtained. Please send us an e-mail and the requested report will be sent to you by
||In the report the
test results, the performances (z-scores), the test methods and all other confidentional
information is presented under Labcode. The relation between Labcode and participant is
only revealed to the laboratory itself.
This years program.
The iis yearly program starts in August and
proceeds to July next year. During the summer holiday periods the program is on hold.
developed PT-schemes tailored to your requirements
If you need a PT-scheme,
for instance for evaluation of supplier laboratories, laboratories of your group or
similar laboratories in your own region, iis will be happy to organize such a tailor
The schemes are set up to
the wishes of the client, but the set-up will always be based on international accepted
protocols like ISO 5727, ASTM E691, IUPAC, JAOAC, DIN 38402 or NEN 6303. A broad range of
samples and sample types can be handled. The tailor made interlaboratory studies may be on
petroleum products or petrochemicals, but also other type of products, like soils,
foodstuffs or gases.
Schemes and ideas
To meet the whishes of its
clients, the Institute for Interlaboratory Studies is continuously expanding the
PT-schemes it offers.