Detection of rapid loss of intravascular volume due to hemorrhage or fluids can be a time sensitive data point in critical situations. One way to measure this is through the assessment of capillary refill time (CRT) which has been shown to significantly vary between physicians. Recent literature has shown objective technology for this assessment with good accuracy across wide varieties of skin tones. Goal-directed fluid management often uses manual CRT measurements as a guiding metric. The goal of this study was to evaluate the objective CRT metric before and after healthy subjects donated blood. The hypothesis was that the CRT would become prolonged after donation.