Emergency Department Length of Stay (ED LOS) Inclusion and Exclusion Criteria for Website Reporting
 
Inclusion Criteria:
  • Emergency Department visits with Registration dates within date range.
  • High Acuity Patients:
  • 1. Admitted Patients with assigned CTAS levels I-V** including cases with missing CTAS levels.
    ED visits with Disposition Codes 06-07* .
    2. Non-Admitted Patients with assigned CTAS levels I-III**.
    ED visits with Disposition Codes 01, 04-05 & 08-15*.
  • Low Acuity Patients:
  • 1. Non-Admitted Patients with assigned CTAS levels IV-V**.
    ED visits with Disposition Codes 01, 04-05 & 08-15 *
    * NACRS Disposition Code description
    ** Canadian Triage and Acuity Scale (CTAS) description.
Exclusion Criteria:
  • ED visits where Left ED Date/Time and Disposition Date/Time are both missing.
  • ED visits where patients are over the age of 125 on the earlier of triage or registration date
  • Duplicate cases within the same functional center where all ER data elements have the same values except for Abstract ID number
  • Cases pertaining to Psychiatric assessment units reported in functional centre 7131076 - evaluated and approved by CCO's ED Information Program
  • Cases where the Scheduled visit Indicator flag is = 'Y'
  • Admitted/Transferred patients (Disposition Code 06-09) where Patient left ED date/time is missing
  • ED visits where patient left the Emergency Department without being seen by a physician (Disposition Code 02 & 03)
Other Criteria:
  • ED visits with missing CTAS level for admitted patients are included in the calculation of the ED Length of Stay of high acuity patients. If the ED Length of Stay is calculated by CTAS level, ED visits with missing CTAS levels are excluded.
  • ED visits with missing CTAS level for non-admitted patients are excluded in the calculation of the ED Length of Stay of high acuity patients and low acuity patients.
  • Starting with April 09 ER data, times spent in designated Clinical Decision Units are excluded in the total time spent in the ER.
Table 1. Emergency Department Disposition Codes
 
ED Disposition Code Description 1
01 Discharged Home (private dwelling, not an institution; no support services)
02 Patient registered, left without being seen (LWBS), or treated by a service provider (before triage if ED visit)
03 Patient triaged and then left the emergency department before further assessment by a service provider (e.g. physician, nurse, allied health provider) (patient registered)
04 Patient triaged (if ED Visit), registered and assessed by a service provider (e.g. physician) and left without treatment
05 Patient triaged (if ED Visit), registered, and assessed by a service provider and treatment initiated; left against medical advice (LAMA) before treatment completed
06 Admitted into reporting facility as an in-patient to critical care unit or operating room directly from an ambulatory care visit functional centre
07 Admitted into reporting facility as an in-patient to another unit of the reporting facility directly from the ambulatory care visit functional centre
08 Transferred to another acute care facility directly from an ambulatory care visit functional centre. Includes transfers to another acute care facility with entry through the emergency department
09 Transferred to another non-acute care facility directly from an ambulatory care visit functional centre (e.g. stand-alone rehabilitation or stand-alone mental health facility).
10 Death after arrival (DAA) - Patient expires after initiation of the ambulatory care visit. Resuscitative measures (e.g. cardiopulmonary resuscitation or CPR) may occur during the visit but are not successful.
11 Death On Arrival (DOA) - Patient is dead on arrival to the ambulatory care service. Generally there is no intent to resuscitate (e.g. perform CPR). Includes cases where the patient is brought in for pronouncement of death.
12 Intra facility transfer to day surgery
13 Intra-facility transfer to the emergency department
14 Intra-facility transfer to clinic
15 Discharged to place of residence (Institution e.g. Nursing or Retirement Home or Chronic Care; Private Dwelling with Home Care, VON, Meals on Wheels, etc.; or Jail)
1 National Ambulatory Care Reporting System - 2009-2010, Section 5 - Data Element Detailed Description and Collection Guidelines