title: Is routine prenatal karyotyping indicated in pregnancies of very young women?
mesh_terms: D004314:Down Syndrome / Q000175:diagnosis* / Q000453:epidemiology; D005260:Female; D006801:Humans; D007484:Iowa; D007621:Karyotyping; D008403:Mass Screening; D008423:Maternal Age; D011247:Pregnancy; D011296:Prenatal Diagnosis