Increase in AFP is seen in all except :

Increased maternal serum Alpha Fetal Protein is seen in underestimated gestational age,multifetal gestation,fetal death,neural tube defect,gastroschisis,omphalocele,cystic hygroma, esophageal and intestinal obstruction,liver necrosis,renal anomalies,cloacal exstrophy,osteogenesis imperfecta,sacrococcygeal teratoma,congenital skin abnormality,pilonidal cyst,chorioangioma of placenta,placenta intervillous thrombosis,placental abruption,oligohydromios,pre eclampsia, fetal growth restriction, maternal hepatoma or teratoma low levels are seen in obesity, diabetis mellitus,trisomies 21 and 18,gestational trophoblastic disease reference: william's textbook of Obstetrics 24 th edition page no 287