Table 2

Types of established indications in cases of diagnostic error*

Established indicationTotal
Colorectal cancer (n=56)
 Faecal occult blood test positive33
 Bright red blood per rectum21
 Microcytic anaemia15
 Iron deficiency anaemia10
 Change in bowel habit8
 Abnormal barium enema2
 Abnormal imaging other than barium enema2
Lung cancer (n=30)
 Abnormal chest x-ray18
 Abnormal chest CT scan8
 Chronic cough3
 Weight loss >10 lbs2
  • * Some cases have more than one missed clue.