Parameters to Know Before Donating Blood
The process of blood donation includes a free medical checkup for the donor. Before donating blood, the donor's hemoglobin level is tested. If it is found to be lower than 12.5 g/dL, it isn't safe for the donor to lose any more blood, as it could make him/her anemic. Besides hemoglobin, the donor's blood pressure and body weight is also checked.