CTPA usage 2009–2014
| Year | Annual total no. of CTPAs (% change from 2009) | No. of CTPAs in 6-week reference period (% of annual total) | No. of technically inadequate CTPAs (% of reference scans) | No. of scans positive for acute PE (% of technically adequate reference scans) | No. of scans negative for any diagnosis (% of all reference scans) |
|---|---|---|---|---|---|
| 2009 | 1973 (n/a) | 242 (12.3%) | 19 (7.9%) | 51 (22.9%) | 39 (16.1%) |
| 2010 | 2317 (+17.4%) | 249 (10.7%) | 11 (4.4%) | 41 (17.2%) | 42 (16.9%) |
| 2011 | 2561 (+29.8%) | 320 (12.5%) | 20 (6.3%) | 60 (20.0%) | 42 (13.1%) |
| 2012 | 2759 (+39.8%) | 329 (11.9%) | 25 (7.6%) | 57 (18.8%) | 43 (13.1%) |
| 2013 | 3017 (+52.9%) | 348 (11.5%) | 18 (5.2%) | 67 (20.3%) | 52 (14.9%) |
| 2014 | 3302 (+67.4%) | 394 (11.9%) | 20 (5.1%) | 77 (20.6%) | 55 (14.0%) |