Ideally all practicing laboratories, whether government or private, should participate in a national or international EQAS
Assessing the quality of Salmonella serotyping and antimicrobial susceptibility testing in national laboratories worldwide experiences from four years of WHO Global Salm-Surv EQAS
For fresh EQAS
samples there was a systematic bias between results obtained with different methods.
If necessary, reported EQAS
results were converted into units given in Table 3 before data analysis.
Diabetes patients participating in the EQAS
received 2 control samples by post twice a year.
The spectrophotometric reference method (18) calibrated with NIST Standard Reference Material 917b, was used in 1 center (center 3) to assign target glucose values, traceable to NIST, to a set of frozen serum pools to be used in the EQAS
study, established and performed as for Hb [A.
and PT providers should make available commutable materials for regularly recurring assessment of serum creatinine measurement performance in routine clinical laboratories.
In the NOKLUS EQAS
for glucose, control materials in 2 concentrations are sent to ~1900 participating Norwegian office laboratories twice a year.
In Norway, the study included GPs participating in 2 different EQAS
performed by NOKLUS (one for BG and one for [HbA.
5] Nonstandard abbreviations: ISO, International Organization for Standardization; CDI, Centro Diagnostico Italiano; LIS, laboratory information system; ALT, alanine aminotransferase; EQAS
, external quality assessment scheme; GGT, [gamma]-glutamyltransferase; AST, aspartate aminotransferase; CRP, C-reactive protein; and PSA, prostate-specific antigen.
Blood samples provided as part of EQAS
(35-37) were also analyzed to provide additional information on the trueness of the method at different concentrations and its long-term performance.
in The Netherlands provides results only and does not offer any judgments as to proficiency.