What are six causes of a decreased AFP level? What is the differential diagnosis for an increased alpha fetoportein (AFP) level? What is the significance of bands? What is the significance of synechiae? (usually much thicker than bands) What is the significance of the chorioamnionic membrane? What is the significance of the intertwin membrane? Book traversal links for Pregnancy complications ‹ What percentage of twins are monozygotic (identical)? Up What are six causes of a decreased AFP level? ›