Supporting Material

Accredited Proficiency Testing laboratories perform better

A study conducted by CALA, a Canadian Accreditation body, carried out comparisons between accredited and non-accredited laboratories providing results to a CALA proficiency testing (PT) programme.

The data involved  inorganic tests, organic tests and microbiological tests. In all cases examined, the percentage of both ‘Questionable’ and ‘Unsatisfactory’ performance was higher for non-accredited laboratories than for accredited laboratories.

A copy of the paper is available here.