title: A randomized study of three cannulas for transcervical chorionic villus sampling.
abstract: A randomized trial involving 200 transcervical chorionic villus samples taken with three different cannulas was undertaken. In terms of karyotype recovery and ease of insertion the aluminum cannula performed best although the placental site influenced the ability to recover villi for all cannulas.
mesh_terms: D000328:Adult; D002404:Catheterization / Q000295:instrumentation*; D002584:Cervix Uteri; D002824:Chorionic Villi / Q000648:ultrastructure*; D002869:Chromosome Aberrations / Q000175:diagnosis; D025063:Chromosome Disorders; D005260:Female; D006801:Humans; D007621:Karyotyping; D010298:Parity; D010920:Placenta; D011247:Pregnancy; D011261:Pregnancy Trimester, First; D011296:Prenatal Diagnosis / Q000295:instrumentation*; D011897:Random Allocation