# Diagnostic activity and waiting lists

> Monthly tests and procedures beside the number still waiting, for all 15 DM01 categories.

- Category: NHS
- Cadence: monthly
- Status: Published on a monthly cadence.
- Dataset key: `nhs-diagnostic-activity-by-test`
- Source: [NHS England](https://www.england.nhs.uk/statistics/statistical-work-areas/diagnostics-waiting-times-and-activity/monthly-diagnostics-waiting-times-and-activity/)
- Licence: Open Government Licence v3.0 — [terms](https://www.nationalarchives.gov.uk/doc/open-government-licence/version/3/)
- Canonical page: [https://londongraph.com/g/nhs-diagnostic-activity-by-test](https://londongraph.com/g/nhs-diagnostic-activity-by-test)
- Machine-readable record: [https://londongraph.com/data/nhs-diagnostic-activity-by-test](https://londongraph.com/data/nhs-diagnostic-activity-by-test)

## Methodology

Total monthly activity and end-of-month waiting list from the latest DM01 provider extract, summed across active London trusts. The two are flows and stocks respectively, so their sizes can be compared but must not be subtracted. Provider location is not patient residence.

## Visualisations

- [Overview](https://londongraph.com/g/nhs-diagnostic-activity-by-test): Monthly tests and procedures beside the number still waiting, for all 15 DM01 categories.
- [Distribution](https://londongraph.com/g/nhs-diagnostic-activity-by-test?view=distribution): Show every published value around the median and quartiles.

## Citation guidance

Attribute the original publisher named above and identify LondonGraph as the visualisation and methodology layer. Do not describe live values as a historical census, and do not present placeholder values as observations.