Transcranial doppler has been a developing interest to point-of-care ultrasound enthusiasts. While it has been a mainstay for certain inpatient indications, only relatively recently have some bold souls proposed application in the acute care setting. These uses include assessing for midline shift, vasospasm, elevated intracranial hemorrhage. This article explores an even more novel idea - using it in the early period after a traumatic brain injury to assess resultant changes in cerebral blood flow. Perhaps this could provide a non-invasive measurement with important prognostic implications. https://www.ultrasoundgel.org/107 https://bit.ly/2O04ycd