\sˌiːˈe͡ɪt͡ʃ fˈɪfti ɐsˈe͡ɪz], \sˌiːˈeɪtʃ fˈɪfti ɐsˈeɪz], \s_ˌiː__ˈeɪ_tʃ f_ˈɪ_f_t_i_ ɐ_s_ˈeɪ_z]\
Definitions of CH50 ASSAYS
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Usual screening assay for complement. Dilutions of the serum to be tested are added to antibody-coated erythrocytes and the percentage of lysis is measured. The values are expressed by CH50, hemolytic complement units per milliliter, which is the dilution of serum required to lyse 50 percent of the erythrocytes in the assay.
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