Primary Objective
To determine the prevalence of anterior pituitary gland dysfunction in traumatic brain injury in Scotland.

Secondary Objectives
To determine whether clinical and radiologically parameters available on presentation can predict likelihood of developing PTPD in patients with TBI.
To determine the optimal timing after TBI for blood tests to diagnose PTPD
To determine whether PTPD effects functional recovery as determined by the extended Glasgow Outcome Score (eGOS)