What is the difference between RH negative and RHnull?

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The Rh blood group system consists of 49 defined blood group antigens.

One of them is the D antigen.

If you test negative for the presence of the D antigen, you are Rh Negative.

This is why Rh Negative is also often listed as Rh(D) negative or D negative.

If you test negative for the presence of ALL antigens of the Rh Blood Group System, you are RHnull.

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