Background: The incidence and distribution of unexpected antibody screening test has been evaluated with Caucasian RBC panel cell. In spite of high incidence of Dia and Mia antigen phenotype in Korea-Mongoloid and south-east population respectively, there has been no documented research on the incidence of anti-Dia and anti-Mia in Korea particularly. To investigate the frequencies and clinical significance of unexpected antibody, screening test including Dia and Mia panel cell was performed.

Method: We analyzed the result from 17,664 antibody screening tests performed during recent 30 month period (March 2001–Sep 2003). Antibody screening and identification test are performed using Liss/Coombs gel test with DiaMed-ID system (DiaMed AG, Cressier, Morat, Switzerland) including Dia and Mia panel cell. The incidence of Dia and Mia phenotype was simultaneously evaluated.

Results: The incidence of unexpected antibodies was 1.2% (214/17,664). Antibodies that were detected most frequently were anti-Rh (74 patient), followed by anti-Lewis (21 patient) and anti-Dia (15 patients). Out of 6345 patients, 3 anti-Mia (0.047%) were detected. Antibodies of Dia and Mia were IgG specificity and anti-Dia was immune antibody, anti-Mia was mixed with immune and natural antibodies. The frequencies of Dia and Mia phenotye were 12.2% and 0.93% respectively.

Conclusion: This study shows that anti-Dia and Mia antibodies are detected frequently for Korean. For safer transfusions, therefore, Dia and Mia panel cell should be also included in antibody screening test for Korean.

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