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Improving access to diagnostics: an evaluation of a satellite laboratory service in the emergency department
  1. P Leman1,
  2. D Guthrie2,
  3. R Simpson2,
  4. F Little3
  1. 1Emergency Department, St Thomas’ Hospital, London, UK
  2. 2Pathology Directorate, St Thomas’ Hospital
  3. 3Health Economist, Colchester, UK
  1. Correspondence to:
 Dr P Leman
 Emergency Department, Fremantle Hospital, Alma Street, Fremantle 6160, Australia;


Objectives: To measure the impact of a satellite laboratory upon laboratory result turnaround times and clinical decision making times.

Design: A prospective cohort study, the intervention group had blood tests sent Monday to Friday 12 noon to 8 pm and the control group had blood tests sent outside these hours. The data were collected over a six week period before the laboratory was opened, and a subsequent six week period.

Setting: An urban teaching hospital emergency department.

Participants: 1065 patients requiring blood tests.

Main outcome measure: Time from the blood sample being sent to the laboratory to the results being available on the clinician’s computer.

Results: The time to haematology (blood count) results in the intervention group decreased by 47.2 minutes (95% CI 38.3 to 56.1, p<0.001) after the laboratory was opened. The corresponding control group times were unchanged (0.6 minutes; −13.8 to 15.0, p = 0.94). Similar sized differences were also seen for haemostasis (d-dimer) testing 66.1 (41.8 to 90.4) minutes compared with −14.2 (−47.1 to 18.7) and chemistry 41.3 (30.3 to 52.2) compared with −4.2 (−17.4 to 8.9) testing. Decisions to discharge patients were significantly faster (28.2 minutes, 13.5 to 42.8, p<0.0001) in the intervention group after the laboratory was opened (controls; −2.6 minutes −27.0 to 21.7). No change was seen with decisions to admit patients. There was a trend for earlier laboratory results modifying intravenous drug or fluids orders, or both (p = 0.06)

Conclusion: A comprehensive satellite laboratory service is an important adjunct to improve the timeliness of care in the emergency department.

  • diagnostics
  • pathology
  • laboratory

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  • Funding: none.

  • Conflicts of interest: none declared.