How is Demand Not from the Wait List numbers calculated?

SystemView defines such patients as ‘demand not from the waiting list’. These patients are identified as those that were not on the outpatient wait list at the beginning of the week.

Not all patients treated in outpatients were necessarily on the outpatient wait list; many patients access outpatients via the Emergency Department or other avenues.

Although these patients often have an outpatient referral, and so are hypothetically on the outpatient wait list for a short period of time (sometime hours), our capture of the outpatient wait list is not always at a frequency to record this.