Conversion Archetypes Catalogue¶

Reusable workload-to-capacity conversion methods shared across functional areas.

SUMMARY

Flow-space: How many patients are in the area at the same time?
Recovery occupancy: How many short-stay beds/spaces are needed during operating hours?
Bed occupancy: How many beds are needed to support overnight and multi-day stays?
Time utilisation: How much procedural time is required?
Appointment utilisation: How many appointment slots are required?
Session capacity: How many treatment sessions can be delivered?

id	archetype_family	conversion_archetype	formula	typical_workload_object	typical_operational_parameters	example_functional_areas
FRM_FLOW_SPACE	occupancy-based	flow-space occupancy	occupancy_hours / (annual_operational_hours × utilisation)	['occupancy_hours']	['operational hours', 'utilisation']	['A&E', 'SDEC']
FRM_RECOVERY_OCCUPANCY	occupancy-based	recovery occupancy	occupancy_hours / (annual_operational_hours × occupancy)	['occupancy_hours']	['operational hours', 'occupancy']	['daycase recovery', 'maternity assessment']
FRM_BED_OCCUPANCY	occupancy-based	bed occupancy	bed_days / (annual_operational_days × occupancy)	['ward_bed_days', 'critical_care_bed_days', 'assessment_bed_days']	['operational days', 'occupancy']	['inpatient wards', 'critical care', 'maternity wards']
FRM_TIME_UTIL	time-based utilisation	procedural time utilisation	procedure_hours / (annual_operational_hours × utilisation)	['procedure_hours']	['operational hours', 'utilisation']	['theatres', 'cath labs', 'endoscopy procedures']
FRM_APPOINTMENT_UTIL	time-based utilisation	appointment-slot utilisation	scheduled_time_hours / (annual_operational_hours × utilisation)	['consultation_hours', 'procedure_hours']	['operational hours', 'utilisation']	['OP consultations', 'OP procedures']
FRM_SESSION_CAPACITY	throughput-based	session capacity	treatment_sessions / annual_session_capacity_per_bed	['treatment_sessions']	['sessions per day', 'operational days']	['renal daycase']

Archetype	Description
FRM_FLOW_SPACE	Used where capacity is constrained by the number of patients that can be accommodated concurrently within an operational period. Typical examples are A&E and SDEC, where demand is driven by arrivals and length of stay, and the primary concern is whether sufficient space exists to absorb patient flow.
FRM_RECOVERY_OCCUPANCY	Used for short-stay areas where patients occupy beds or spaces temporarily before discharge or transfer. Capacity is driven by turnover and occupancy during operational hours rather than overnight bed stock.
FRM_BED_OCCUPANCY	Used where capacity is constrained by the availability of continuously occupied beds over 24-hour periods. Typical examples are inpatient wards, critical care, and maternity wards, where patients may remain for multiple days and occupancy accumulates overnight.
FRM_TIME_UTIL	Used where capacity is constrained by the amount of schedulable procedural or treatment time available. Typical examples are theatres, cath labs, endoscopy rooms, and procedure suites, where the key resource is operating time rather than physical occupancy.
FRM_APPOINTMENT_UTIL	Used where capacity is constrained by the availability of schedulable appointment slots. Typical examples are outpatient consultation and procedure rooms, where workload is generated by appointments and operational performance is influenced by factors such as consultation duration and DNA rates.
FRM_SESSION_CAPACITY	Used where capacity is planned and managed in terms of treatment sessions rather than time or occupancy. Typical examples are dialysis and other session-based services where throughput is typically expressed as sessions per chair, bed, or treatment space over a defined period.