RBTT is an all-in-one blood test product from blood collection, buffer mixture, blood test strip to final interpretation. It improves the blood test strips, simplifies the process and is attached to the patient, allowing the healthcare staff to quickly determine the blood group for the patient requires emergency transfusion. Based on the utility of blood test strip and buffer solution, RBTT visualizes blood group with color and symbols to provide a simple interface, letting the users operate and interpret quickly. Extracting blood via hollow microneedles makes the workflow easier, bringing painless blood extraction experience to patients.