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Medical Definition of Rh blocking test
1. A test for nonagglutinating Rh antibodies: an Rh agglutination test is first carried out; if the test for Rh agglutinins is negative, then 1 drop of anti-Rho agglutinating serum of moderate titre is mixed with the patient's serum containing Rh-positive test cells; if after incubating for from 1 to 2 hr at 37°C no agglutination occurs, Rho-blocking antibodies are assumed to be present in the patient's serum. (05 Mar 2000)