The-Strategy-Unit / The-Strategy-Unit/open-plan-docs

Outpatient consult workload formula

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#166 4 comments 1 reaction 1 assignee View on GitHub

@paulseamer is already working on this.

Since Sep 10, 2026.

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Description

If the activity input is attended appointments, multiplying attendances directly by the DNA rate slightly understates missed slots if the DNA rate is defined as a percentage of all booked appointments (i.e., attended appointments + DNAs).

All types of outpatient activity are affected (general consult, virtual consult, and procedures).

The correct formula is:

$$\text{effective consultation time}=\text{consultation time}+\left(\frac{\text{DNA rate}}{1-\text{DNA rate}}\times \text{DNA time}\right)$$

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