How common is Weak D?

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If you are a Weak D, you are actually rh positive with a weak expression of the D, meaning that you can show up as an Rh(D) negative in some blood type tests, but Rh(D) positive in others.

You may be a weak D and not even know it.

A Rhesus D (RhD) red blood cell phenotype with a weak expression of the D antigen occurs in 0.2% to 1% of whites and is called weak D, formerly Du.

Source: Molecular Basis of Weak D Phenotypes
In pregnancies, this issue can become important.

See also: 4 major reasons why blood type tests can show different results

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