Screening by using maternal serum alpha fetoproteins helps to detect all of the following except:

Elevated Levels Error in dates Multifetal pregnancy Severe oligohydramnios Neural tube defects Pilonidal cysts Esophageal or intestinal obstruction (and atresia) Liver necrosis Cystic hygroma Sacrococcygeal teratoma Fetal death Abdominal wall defects: – omphalocele – gastroschisis Urinary obstruction Renal anomalies: – polycystic kidney – absent kidneys Congenital nephrosis Osteogenesis imperfecta Congenital skin defects Cloacal exstrophy Chorioangioma of placenta Low birth weight Placental abruption Placenta accreta Preeclampsia Improper adjustment for low maternal weight Maternal hepatoma or teratoma Low Levels G: Gestational trophoblastic diseases O2: Overestimated gestational age, overweight mother A: Spontaneous abortion T: Trisomy (21 or 18)