Repeated examinations of the coagulation and CT scan were done in 35 patients with head injury and the relationships between the coagulation disorder and the secondary brain injury were explored.

Special procedures, eg, specific radiographic evaluations and laboratory studies, also are obtained at this time. Complete evaluation of the patient requires repeated physical examinations.

Where the validity of the examinations already performed may be questionable because of an identified source of error the tests shall be repeated after exclusion of that cause.