rh antibody การใช้

• The mother has an intramuscular injection of anti-Rh antibodies ( Rho ( D ) immune globulin ).
• For example, the indirect Coombs test detects the presence of anti-Rh antibodies in a pregnant woman's blood serum.
• Therefore, her humoral immune system will not make anti-Rh antibodies, and will not attack the Rhesus antigens of the current or subsequent babies.
• This is passive immunity and the effect of the immunity will wear off after about 4 to 6 weeks ( or longer depending on injected dose ) as the anti-Rh antibodies gradually decline to zero in the maternal blood.
• If a few weeks later the same patient had an indirect Coombs titer of 32 ( 1 / 32 dilution which is 1 part serum to 31 parts diluent ), this would mean that she was making " more " anti-Rh antibody, since it took a greater dilution to abolish the positive test.