Answer to Question 1
4
1. Incorrect. During the third trimester, the only immunoglobulin that crosses the placenta, IgG, provides passive acquired immunity to specific bacterial toxins. The fetus produces IgM by the end of the first trimester. IgA immunoglobulins are not produced by the baby.
2. Incorrect. By the third trimester, the fetus has IgG and IgM. Breastfeeding will supply the baby with IgA immunoglobulins.
3. Incorrect. This is not an accurate statement. By the third trimester, the fetus has IgG and IgM.
4. Correct. During the third trimester, the only immunoglobulin that crosses the placenta, IgG, provides passive acquired immunity to specific bacterial toxins. The fetus produces IgM by the end of the first trimester.
Answer to Question 2
3
1. Incorrect. Indications for PUBS include prenatal diagnosis or inherited blood disorders, karyotyping of malformed fetuses, detection of fetal infection, determination of the acid-base status of the fetus with IUGR, and assessment and treatment of isoimmunization and thrombocytopenia in the fetus.
2. Incorrect. Determination of fetal size by ultrasound is typically done during the second trimester and is not indicated in this scenario.
3. Correct. An amniocentesis would be performed to assess fetal lung maturity in the event of a preterm birth.
4. Incorrect. A nonstress test measures the fetal response to fetal movement in a noncon-tracting mother.
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