In order to identify a potential organ donor as early as possible and maximise the donor conversion rate, it is important to study this conversion rate. However, the donor conversion rate is calculated with different assessment tools, making it difficult to compare across studies and centres. de Groot and colleagues [68] conducted a study to determine which assessment tool can be used for a realistic estimation of a potential organ donor pool, and how they compare to each other with regard to the donor conversion rate. They conducted a retrospective chart review of patients diagnosed with a subarachnoid haemorrhage, traumatic brain injury, or intracerebral haemorrhage, and applied three different assessment tools. In their cohort of patients, 179 out of 564 (32%) died. After applying three different assessment tools, the number of patients found to be brain dead, before exclusion due to medical reasons or age, ranged from 76 to 107 patients. The authors identified one tool that was the most practical for identifying patients with a realistic chance of becoming brain dead and therefore identifying the patients most likely to become a potential organ donor.