External Quality
Assessment in the Evaluation of Laboratory Performance of Faecal Culture
In Finland, all laboratories carrying out
diagnostics of infectious diseases in humans are approved by the Regional State
Administrative Agencies and are obligated to participate in External Quality
Assurance rounds. Performance in these rounds is thought to reflect the quality
of laboratory work. In the 6-year study period, 17 Finnish laboratories
received 48 simulated faecal specimens for the culturing of diarrhoeal pathogens,
yielding altogether 586 faecal culture External Quality Control specimens and
581 reports. The results were correct in 92% of all reports and in 67% of all
specimens. False-negative Salmonella results were given for 2 of the 18
specimens, one with biochemically atypical Salmonella strain and the other with
a low count of Salmonella cells. False-negative Shigella report was given for 6
of the 7 specimens in some participating laboratory. Detection of all common
faecal pathogens is especially relevant to patient safety, public health, and
epidemiological surveillance.
Sumber : http://insights.sagepub.com/
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