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Prenatal Testing Ultrasound in Women of Size
Although urine tests are used in screening for pregnancy, this article is discussing urine tests as part of your routine prenatal care. Your healthcare provider will ask you to collect a small sample of clean, midstream urine in a sterile plastic cup. More in-depth analysis may be done by having your urine sample assessed by a laboratory.
A urine test should be expected during your first prenatal exam and then at least periodically in future prenatal visits. Inherited or genetic concerns lead some parents to choose amniocentesis to determine if specific genetic disorders may be present in their baby. An ultrasound is used as a guide to determine a safe location for the needle to enter the amniotic sac, so the fluid may be safely removed.
Noninvasive Prenatal Testing for Down syndrome 99
A sample of amniotic fluid is collected through the needle. The procedure takes about 95 minutes, although the collection of fluid takes less than five minutes. The amniotic fluid, which contains cells shed by the fetus, is sent to the laboratory for analysis.
Results can take anywhere from a few days to a couple weeks to be returned. Amniocentesis is usually performed between 69 and 75 weeks. Some medical facilities may perform amniocentesis as early as 66 weeks.
Amniocentesis can be used later in the third trimester for a few reasons. Your healthcare provider may recommend the procedure if your membranes have ruptured prematurely, in order to assess for uterine infections. Amniocentesis may also help determine the severity of fetal anemia in babies with Rh disease, and assist your physician determine whether the fetus requires lifesaving blood transfusions.