When reviewing laboratory results for a 1-day-old infant, the nurse notes that the infant's IgM antibodies are elevated. Which is the least likely cause of the infant's IgM antibody level elevation?

Question

Quizplus · Accepted Answer

IgM antibodies are too large to cross the placenta, so maternal-fetal transfer of IgM in utero is not possible. Elevated IgM in a newborn suggests an in utero infection, as IgM is produced by the fetus in response to an antigen.

When Reviewing Laboratory Results for a 1-Day-Old Infant, the Nurse