We usually do test a specimen when we admit a patient the blood type, then inpute the result into the computer, where through network the doctor can see the result.When they ask for blood , they will write the first blood type result on the sheet, then we will recheck it through a new specimen for transfusion crossmatch.
Sometimes the first result is wrong due to wrongly specimen collection or other reasons, but most of the time it is right, and through this kind of process, we can find out the D neg blood type early( which is rare in Chinese Han people) and AB subgroup blood early before the blood application.