Introduction of PT

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Information about Introduction of PT

Published on August 20, 2009

Author: Josephcw

Source: slideshare.net

Overview of Proficiency Testing Services T he Food and Environment Research Agency (FERA) York - UK

FERA The Food and Environment Research Agency FERA is UK Government Executive Agency Part of the Department for Environment, Food and Rural Affairs ( Defra ) Over 6 00 scientific staff Public and private sectors Research-based organisation Expanding into private sector Safeguarding the food supply chain and the environment

The Food and Environment Research Agency FERA is UK Government Executive Agency

Part of the Department for Environment, Food and Rural Affairs ( Defra )

Over 6 00 scientific staff

Public and private sectors

Research-based organisation

Expanding into private sector

Safeguarding the food supply chain and the environment

FERA – www.fera.defra.gov.uk

FERA – FAPAS Proficiency Testing http://www.fera.defra.gov.uk/foodDrink/proficiencyTesting.cfm

Quality Assurance Customers need to be assured of data quality Internal Quality Control Validated methods Reference materials Routine blank and recovery checks External Quality Control Accreditation Proficiency testing

Customers need to be assured of data quality

Internal Quality Control

Validated methods

Reference materials

Routine blank and recovery checks

External Quality Control

Accreditation

Proficiency testing

Why Proficiency Testing? Essential element of laboratory quality assurance Comply with regulations and standards Aid laboratory accreditation Import/Export regulations Meet customer requirements Demonstrate competence

Essential element of laboratory quality assurance

Comply with regulations and standards

Aid laboratory accreditation

Import/Export regulations

Meet customer requirements

Demonstrate competence

What is Proficiency Testing? The ISO definition of laboratory proficiency testing is: “ Determination of laboratory testing performance by means of inter laboratory comparisons” PT is a test of accuracy by comparing the laboratory results with the ‘true’ value

The ISO definition of laboratory proficiency testing is:

“ Determination of laboratory testing performance by means of inter laboratory comparisons”

PT is a test of accuracy by comparing the laboratory results with the ‘true’ value

FAPAS Proficiency Testing Schemes Launched 2001 by CSL 220 GeMMA food GMO Set up in 1970s by Yorkshire Water, transferred to CSL in 2000 480 LEAP water/environment Launched 1997 from UK MAFF Quality Assessment Scheme 550 FEPAS food microbiology Established 1990 by UK MAFF. ~14,000 tests in 2007/8 First year 2005 1950 15 FAPAS food chemistry plant health Background Labs 2007/8 Scheme

Participation in Proficiency Testing Any laboratory may participate in FAPAS proficiency testing Laboratories should use the analytical methods of their choice Laboratories may choose to take part in as many, or as few, proficiency tests as they wish Each laboratory receives a confidential report showing anonymous results for all participants

Any laboratory may participate in FAPAS proficiency testing

Laboratories should use the analytical methods of their choice

Laboratories may choose to take part in as many, or as few, proficiency tests as they wish

Each laboratory receives a confidential report showing anonymous results for all participants

Conducting Proficiency Tests Prepare test material Check the test material is homogenous Distribute test material Receive participants results Statistically assess participants results Produce the PT report Distribute the report to all participants Whole process informs future PTs

Prepare test material

Check the test material is homogenous

Distribute test material

Receive participants results

Statistically assess participants results

Produce the PT report

Distribute the report to all participants

Whole process informs future PTs

Analysis and submission of results The participating labs carry out their normal analytical procedure and get a result They send their result to us

The participating labs carry out their normal analytical procedure and get a result

They send their result to us

Submitting Results -1

Submitting Results - 2

Why do results vary? Results always vary, even between good labs No matter how hard you try there will ALWAYS be slight differences in the way you do a task

Results always vary, even between good labs

No matter how hard you try there will ALWAYS be slight differences in the way you do a task

What is the true result/correct answer? The consensus: an average of the results submitted – mean, median or mode Information from how the material was prepared Information on what methods were used we can make a best estimate of the true result

The consensus: an average of the results submitted – mean, median or mode

Information from how the material was prepared

Information on what methods were used

we can make a best estimate of the true result

Z-Score

Interpretation of z-Scores z-scores can be interpreted as: |z| <= 2 ‘satisfactory’ |z| <= 3 ‘questionable’ |z| > 3 ‘unsatisfactory’

z-scores can be interpreted as:

|z| <= 2 ‘satisfactory’

|z| <= 3 ‘questionable’

|z| > 3 ‘unsatisfactory’

Acceptable Range of results the good labs (those with bars inside the lines) are separated from the not so good (those with bars outside the lines)

the good labs (those with bars inside the lines) are separated from the not so good (those with bars outside the lines)

PT Report Confidential: Laboratories given code numbers Comprehensive: Test material preparation Participants results Tables and charts of the results and z-scores Participants methodology

Confidential:

Laboratories given code numbers

Comprehensive:

Test material preparation

Participants results

Tables and charts of the results and z-scores

Participants methodology

After the Proficiency Test PTG offer an advice service to participants who perform poorly Surplus test materials can be sold as ‘quality control’ samples FERA Training Courses

PTG offer an advice service to participants who perform poorly

Surplus test materials can be sold as ‘quality control’ samples

FERA Training Courses

Test Materials Homogeneous test materials are vital for effective proficiency testing Testing/preparation laboratories are accredited if possible Naturally contaminated test materials preferred, if concentrations appropriate Easily mixed to ensure sufficient homogeneity

Homogeneous test materials are vital for effective proficiency testing

Testing/preparation laboratories are accredited if possible

Naturally contaminated test materials preferred, if concentrations appropriate

Easily mixed to ensure sufficient homogeneity

Test Materials

Test Material Homogeneity All participants must receive identical test materials, homogeneous for all analytes At least 10 test materials analysed in duplicate for each analyte Results subject to a statistical protocol to confirm homogeneity

All participants must receive identical test materials, homogeneous for all analytes

At least 10 test materials analysed in duplicate for each analyte

Results subject to a statistical protocol to confirm homogeneity

Stability of Test Materials Test materials must be stable for the duration of the proficiency test Period of testing is shortened if test materials are known to be unstable, eg veterinary drug residues Dispatch samples at -18°C in freezer packs to ensure stability of certain test materials

Test materials must be stable for the duration of the proficiency test

Period of testing is shortened if test materials are known to be unstable, eg veterinary drug residues

Dispatch samples at -18°C in freezer packs to ensure stability of certain test materials

Dispatch of material

FAPAS Reports Confidential reports are available on a secure section of our website Each participant is given their own unique laboratory number, password and ID Comparison of z-scores with other participants’ z-scores Contain method information Participants can produce certificate

Confidential reports are available on a secure section of our website

Each participant is given their own unique laboratory number, password and ID

Comparison of z-scores with other participants’ z-scores

Contain method information

Participants can produce certificate

In Summary – the FAPAS, FEPAS, GeMMA and LEAP Schemes FAPAS offers the most comprehensive range of proficiency tests for chemical food analysis in the world – 219 tests in 2008/09 FEPAS and GeMMA offer proficiency tests for food-matrix based microbiology and food/feed GMO analysis LEAP Scheme includes chemistry, microbiology, parasitology and Legionella in potable and effluent water samples

FAPAS offers the most comprehensive range of proficiency tests for chemical food analysis in the world – 219 tests in 2008/09

FEPAS and GeMMA offer proficiency tests for food-matrix based microbiology and food/feed GMO analysis

LEAP Scheme includes chemistry, microbiology, parasitology and Legionella in potable and effluent water samples

Surplus Materials from Proficiency Testing Analytes and matrices must be stable Well characterised for analytes of interest Vital substitute when CRMs are not available Proficiency testing samples are chosen to closely resemble routine laboratory samples Low cost Listed on our website

Analytes and matrices must be stable

Well characterised for analytes of interest

Vital substitute when CRMs are not available

Proficiency testing samples are chosen to closely resemble routine laboratory samples

Low cost

Listed on our website

Web site and operation QC Material

How to find Surplus Materials 1 Click “go”

How to find Surplus Materials 2

How to find Surplus Materials 3

Conclusions Proficiency testing is a vital component of quality assurance Participation improve performance, comparison with others and leads to accreditation FERA offers a wide range of analytes in various food and environmental matrices FAPAS ® can supply quality control materials ( www.fapas.com ) Facilitate our service through local agent Local language Currency

Proficiency testing is a vital component of quality assurance

Participation improve performance, comparison with others and leads to accreditation

FERA offers a wide range of analytes in various food and environmental matrices

FAPAS ® can supply quality control materials ( www.fapas.com )

Facilitate our service through local agent

Local language

Currency

Contact details FAPAS the Food and Environmental Research Agency (FERA) Sand Hutton York YO41 1LZ UK Tel: +44 1904 462100 FAX: +44 1904 462111 Website: www.fapas.com

FAPAS

the Food and Environmental Research Agency (FERA)

Sand Hutton

York YO41 1LZ

UK

Tel: +44 1904 462100

FAX: +44 1904 462111

Website: www.fapas.com

Agent Contact details Team Medical & Scientific Sdn. Bhd. 41, Jalan Anggerik Vanilla T31/T, Kota Kemuning, 47600 Shah Alam Selangor Malaysia Tel: +603 5122 5108 FAX: +603 5122 1608 email: info@tms-lab.com Website: www.tms-lab.com Blog : tms-lab.blogspot.com Team Medical & Scientific Sdn. Bhd.

Team Medical & Scientific Sdn. Bhd.

41, Jalan Anggerik Vanilla T31/T, Kota Kemuning, 47600 Shah Alam

Selangor

Malaysia

Tel: +603 5122 5108

FAX: +603 5122 1608

email: info@tms-lab.com

Website: www.tms-lab.com

Blog : tms-lab.blogspot.com

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