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Table 1 Investigation codes and categories

From: Who breaches the four-hour emergency department wait time target? A retrospective analysis of 374,000 emergency department attendances between 2008 and 2013 at a type 1 emergency department in England

Category Investigation code
No investigations ordered no investigations, other investigationsa
Point-of-care tests electrocardiogram, blood gases, pregnancy test, visual (refraction, orthoptic tests, and computerised visual fields), urinalysis
Laboratory tests haematology, blood matching, biochemistry, urine chemistry, histology, clotting, immunological blood tests, cardiac enzyme, toxicology, blood culture, serology, bacteriology
Simple imaging x-ray plain film
Complex imaging computer assisted tomography (CT) scan, ultrasound, magnetic resonance imaging (MRI)
  1. aUsed by clinical teams as a default code if none of the other investigations listed in Table 1 were undertaken (descibes history taking and examination)