Can I do a test during pregnancy and right after childbirth?

Yes, you can. Mother’s antibodies freely pass through the placental barrier and could be absorbed from the mother’s milk during breastfeeding. Oftentimes a mother can overly burden the fetal or newborn’s bloodstream and tissues with her antibodies. Therefore, as a preventative measure, the test is useful for those who are just planning to become a mother: a properly selected diet will help prepare for pregnancy, and then not overload the child's body during gestation and breastfeeding.