What should be prepared for prenatal blood typing serology tests?

Patient's question:

I am O-negative blood type, and my husband is A-positive. We need a prenatal blood type serology test now. What should we prepare?

Doctor's answer:

Analysis of the condition: Hello, if the pregnant woman is type O blood and the male partner is non-O blood, there is a risk of neonatal hemolytic disease due to ABO blood group incompatibility if the fetus is also non-O blood.
Advice: In this case, it is necessary to check the titer of anti-A antibodies. If this titer is significantly lower than 1:320, there is no concern, indicating a low probability of this occurring. No special preparation is needed for this test; you can do it anytime.

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