The disturbances in Criteria A and C are
Delirium is a clinical diagnosis. The reference standard for delirium is considered to be a psychiatrist evaluation using DSM-5 criteria, but it requires significant training to do reliably. A proper delirium evaluation can take approximately 30 to 45 minutes to perform. Therefore, detecting delirium using DSM-5 criteria is not feasible for most ED settings.
American Psychiatric Association. Diagnostic and statistical manual of mental disorders. Fifth ed. Arlington, VA: American Psychiatric Association; 2013.
DSM-5, Diagnostic and Statistical Manual of Mental Disorders, Fifth Edition
ED, emergency department