Knowing your blood type is imperative. Of course, during inpatient treatment, doctors will not ask you about the group or rhesus, they will definitely conduct a laboratory study, but in an emergency, when every minute counts, this information can become vital.
Of course, it is very difficult to establish a blood group without tests, and sometimes it is simply impossible, however, there is a likelihood of such an establishment (but nevertheless, in the future, we recommend contacting a medical institution to clarify the results, because only specialists using special equipment can identify a blood group at a professional level if your blood test is available).
Review the marks on your passport. Many citizens have a special mark about the blood group in the form of a seal, where the Rh factor and the corresponding group are indicated.
Look at your medical record in case the previous action did not work.
Find out your parents' blood type. You should know that if both parents have I, II, etc. blood group, then, accordingly, the child born from them will have the same blood group. If one of the parents has I, and the second, for example, II blood group, then the child can inherit one of them and, accordingly, have either I or II group.
Determine or specify from the statement of the medical record which group characteristics your blood belongs to. Among such signs, there are 0, A and B. Depending on this, determine your blood group. So, 00 is the first blood group, 0A is the second blood group, 0B is the third and AB is the fourth.
Remember, only a medical specialist in a special laboratory can correctly determine the blood group and Rh factor after examining your analyzes.