Proficiency Testing (PT) schemes operate by providing
participating laboratories with test samples for analysis.
Laboratories analyse the test samples, preferably as part of their
normal routine, and reports the results to the scheme organisers.
They are then provided with a report showing how closely their
results agree with the accepted values. Regular participation in a
Provides staff with an insight into their laboratory's
Benchmarks performance with that of other participant
Demonstrates to end users of analytical data, regulatory
bodies and accreditation bodies that there is a commitment to
HSL PT Schemes
HSL operates the following four PT schemes in support of
workplace and environmental asbestos assessments.
The schemes are open to both UK and overseas participants.
Summary information can be found on the individual PT scheme
pages and in detail within the participant handbook available for
Asbestos in Materials
Asbestos in Soils
Low Asbestos Content
Regular Inter-laboratory Counting
SEM Fibre Counting Scheme
HSL PT Quality Control Samples
We have a wide range of QC products and services available to
purchase. Please click here to view.
HSL PT Schemes in Partnership
AIR PT, a collaboration between HSL and LGC, is a new
International PT scheme for laboratories involved in air quality
The scheme combines HSL's WASP and LGC's STACKS schemes,
providing an integrated PT that is specifically designed for
laboratories performing chemical analysis of air monitoring
The scheme is run by LGC and is supported by the technical
expertise at HSL, ensuring the test samples are as close as
possible to those routinely analysed by laboratories (ambient,
indoor, workplace air and stack emissions).
For more information, please click on the AIR PT balloon logo
below. Here you can download the application form and scheme
description, which will provide comprehensive details of the
available samples and the dates for each round of the scheme.
AIR PT Scheme (formerly WASP and STACKS)