Du Test (Rh Typing)


Occasionally blood types are found which, when tested with different anti-Rh (anti-D) sera, give some but not all the serological reactions expected from the presence of the Rh (D) factor, or the intensity of such reactions is consistently weaker than the average. Such “intermediate variants” are usually symbolized as Du. The Rh blood group system is characterized by large allelic diversity and further complexity arises from qualitative as well as quantitative variations in the phenotypic expression of Rh antigens of the D, Cc, and Ee series. For instance, D expression is enhanced in phenotypes in which E/e and sometimes C/c antigens are missing. Conversely, D expression is decreased in weak D (Du) phenotypes in which the CcEe antigens are normally expressed.


Incomplete expression of Rh antigen in blood grouping is usually confirmed by this test.

Sample Type, Quantity & Conditions

1 ml EDTA Whole Blood Room Temperature

Special Precautions

Normal Range

By Report

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