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It is all relative. Yes, antibodies' titers can rise and fall during pregancy whether or not the fetus is positive for the corresponding antigen(s). So titers may not be helpful in a subsequent pregnancy from a mother whom has shown to be an immune responder. But, it may be a one piece of the puzzle a physician can use to make decisions about the management of the pregnancy. It may be an opportunity for us to be part of the team, share our knowledge and experiences with the team, follow the immunohematology path, maybe learn something ourselves and share with our peers. I would be willing to follow the titers, it's Immunohematology, it's what we do, and maybe, just maybe, we might discover something relative. My soapbox for the day, just comments from my perspective as an old retired SBB.

Yes, I am sure they probably order those other tests you mention. But the topic of this thread is on "why titers are not ordered on subsequent pregnancies".