The proportion of people who returned a positive National Bowel Cancer Screening Program (NBCSP) screening test that underwent a diagnostic assessment and were diagnosed with cancer, measured 12 months after the defined period.

This indicator calculates the positive predictive value of follow-up assessment for detecting cancers. This is a measure of the quality and effectiveness of diagnostic assessment.

The NBCSP aims to maximise the early detection of colorectal cancer in the target population.

This can be achieved by detecting cases of colorectal cancer before a person has symptoms, enabling early intervention.

Monitoring the cancer detection rate by various stratifications may also reveal emerging positive or negative trends that need to be investigated and rectified if necessary.

To reduce the effect of any lag time between invitation, positive screen, diagnostic assessment and histopathology, this indicator includes all those who underwent diagnostic assessment in the defined period, not all those invited in the defined period (who had undergone diagnostic assessment).