• S J Steindel and P J Howanitz.
• Public Health Practice Program Office, Centers for Disease Control and Prevention, Chamblee, Ga. 30341, USA.
• Arch. Pathol. Lab. Med. 1997 Oct 1;121(10):1031-41.

ObjectiveTo compare the results of a 1990 College of American Pathologists Q-Probes Emergency Department (ED) turnaround time (TAT) study with a similar study done in 1993 and to identify factors associated with TAT improvement.DesignParticipants gathered data over a 4-week period on the various times of day associated with the ordering, specimen-collection, laboratory-receipt, and result-reporting stages of stat tests for potassium and hemoglobin levels, using a mail-in questionnaire that also included practice parameter questions.ParticipantsLaboratories enrolled in the 1990 College of American Pathologists Q-Probes study on ED TAT and laboratories enrolled in the 1993 program ED TAT study.Main Outcome MeasuresComponents associated with shorter ED TAT and, for those participating in both the 1990 and 1993 studies, comparison with previous results.ResultsSix hundred fifteen hospital laboratories returned data on up to 43,521 hemoglobin and 41,989 potassium specimens. Half of these laboratories collected and reported 90% of their ED potassium results in 53 minutes or less, compared to 61 minutes or less in 1990, and reduced the corresponding median collection-to-reporting TAT for 90% of hemoglobin results from 46 minutes or less to 39 minutes or less. The fastest 10% of laboratories showed interlaboratory median order-to-report TATs of 36 and 50 minutes for potassium and hemoglobin tests, respectively. Comparisons of TATs from 277 laboratories with 1990 and 1993 data were possible. Components found to contribute statistically to improvement of ED TAT between 1990 and 1993 were laboratory control of specimen handling, rapid transport time, and monitoring. Active monitoring was particularly important when the laboratory did not control the specimen-handling process.ConclusionsLaboratories improved their control of ED TAT from 1990 to 1993 and reduced the number of TAT events exceeding 70 minutes. Internally set TAT goals, however, were not met most of the time.

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