1. A method for setting a blood transfusion parameter for a patient, the method comprising: identifying, at a computing system, a blood transfusion bag in a photographic image generated using an optical sensor in communication with the computing system, and, in a region of the photographic image, a fluid surface within the blood transfusion bag; extracting, at the computing system, a color feature from a region of the photographic image corresponding to the blood transfusion bag; identifying, at the computing system, a volume marker printed on the blood transfusion bag in the region of the photographic image; generating, at the computing system, an estimated volume of fluid in the blood transfusion bag based on the volume marker and the fluid surface; estimating, at the computing system, a blood component content within the blood transfusion bag based on the color feature and the estimated volume of fluid; and triggering transfusion from the blood transfusion bag based on the blood component content within the blood transfusion bag and an estimated volemic status of the patient.