<prompt> Clinical criteria of brain death is all exceptComaAbsent brain stem reflexAbsent spinal cord reflexAbsent motor activity  <response>: C i.e. Absent spinal cord reflex Brain Death It is defined as irreversible cessation of all brain function. Spinal cord function below C1 may still be presentQ. Brain death criteria can be applied only in absence of hypothermia, hypotension, drug depressing brain function, neuromuscular blocking agent, endocrinal metabolic abnormalitiesQ, Clinical criteria are: ComaQ - Absence of brain stem i.e., pupillary, gag; corneal, oropharangeal, respiratory, vestibuloocular caloric or cough reflexesQ. Absence of motor activity including decrebate decoicate posturing. Absence of ventilatory effo with the aerial CO2 tension 60 mm Hg or 20 mmHg above pretest level Spinal cord reflexes may be preserved in coma re- examination not 2hour apa is optional.Q Apnea test should be done at last because of its harmful effects on intracranial pressure. Isoelectric EEG, absent brain stem auditory evoked potentials absence of cerebral perfusionQ on angiography, radioisotope scan or transcranial Doppler are confirmatory but not required tests.. 