The use of Carotid Doppler to determine volume responsiveness has recently been proposed. Remarkably, the authors found that an increase in carotid blood flow of 20% predicted fluid responsiveness with a sensitivity of 94% and specificity of 86%. This appears to be an attractive option, with the caveats that not all point of care ultrasound machines currently available have the software capability to calculate carotid artery velocity time integral (VTI) and this method was validated using Bioreactance, the reliability of which has been recently questioned. A more simple method of evaluating the carotid artery for fluid responsiveness, the Carotid Flow Time, was recently discussed on a popular ultrasound podcast, but has not yet been validated in a clinical study.