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
(excluding AISS). Summary information can be found on
the individual PT scheme pages and in detail within the participant
handbook available for each scheme.
Asbestos in Materials
Asbestos in Soils
Scheme (UK Only)
Regular Inter-laboratory Counting
SEM Fibre Counting Scheme
HSL PT Schemes in Partnership
AIR PT, a collaboration between HSL and LGC, is
a new International PT scheme for laboratories involved in air
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
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
AIR PT Scheme (formerly WASP and STACKS)