Patients with SGA neonates have a higher median plasma concentration of IgG APZ-AB than normal pregnant women, or patients with PE or FD; and (2) maternal plasma IgM APZ-AB concentration >90th percentile was associated with vascular placental lesions in patients with PE, but not in those with an SGA neonate, suggesting that in a subset of patients, these antibodies can be associated with abnormal placentation and pregnancy complications...
So this is a marker that breaks in a differential way -- a higher level than normal means *either* an SGA baby, *or* PE with placental lesions but a normally sized baby. That's interesting, because it means in PE with SGA the SGA is developing through a different mechanism. There's more than one biochemical way for this protein to act in a pregnancy, depending on the particular underlying susceptibility of a particular case.
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