title: Estimation of the weight of chorionic villus samples obtained from first trimester pregnancies by transcervical aspiration.
abstract: Eight obstetricians experienced in chorionic villus sampling were asked to estimate the weight of samples of villi with and without a reference photograph. Referral to the photograph significantly improved the accuracy of their estimations.
mesh_terms: D002824:Chorionic Villi / Q000473:pathology*; D005260:Female; D006801:Humans; D011247:Pregnancy; D011261:Pregnancy Trimester, First; D011296:Prenatal Diagnosis; D012015:Reference Standards