1. no a person cannot donate blood with out testing the Rh factor of the blood group.

2. a positive group persons blood wont be suitable to the Rh factor of negative person blood so it is not correct to donate the blood without the doctors prescription.

3. this donation should be carefully done by testing Rh factor or else the blood getting person would die easily by clotting of the blood.

hope so my answer is useful
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I think A positive can donate to A positive or AB positive but it cannot donate to A negative. The Rh factor is the presence of proteins on the cell and if a positive Rh (with proteins) goes into a body that has blood with negative Rh (no proteins), the body will reject them
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