I once talked to my doctor about this topic. He told me that it all depends on your blood type and what kind of phenotype. So first you should pass all the necessary tests.
It often happens that a person is not suitable for blood donation in principle. For example, I have a relatively rare group — the fourth positive. However, because I have occasional bouts of anemia, I was forbidden to donate blood.
It is also essential to go to the proper blood collector so as not to injure yourself. Nurses from the clinic where I go completed these courses — https://phlebotomynearyou.com/phlebotomy-classes-online/. And I always feel comfortable when I give blood for tests.
Edited by cedricworth15, 11 October 2021 - 07:39 PM.