**3. Diagnosis**

Haemorrhagic shock in a patient with traumatic brain injury must be defined using a standard definition in the given setting [13, 14]. The diagnosis of traumatic brain injury and haemorrhagic shock will be evident in most cases. However, a careful clinical evaluation, including a detailed clinical history that can be supplemented with appropriate investigations, is needed to assess the extent of brain injury and haemorrhagic shock [14]. The detailed laboratory investigations shall include complete blood counts (including haemoglobin levels), a coagulation profile, and imaging of the brain or approximate regions to find the cause of haemorrhagic shock.
