Amniocentesis - Mayo Clinic
It is usually performed between the 15th and 20th weeks of pregnancy. Because ultrasound is used during an amniocentesis, it can detect some other types of. Schedule Routine prenatal tests are performed throughout your pregnancy Scans fetal test NT Downs syndrome nasal bone dating anomaly First Trimester Ultrasound sonogram soft CVS is a specialized alternative test to amniocentesis. Nov 8, If you accumulate too much amniotic fluid during pregnancy or rule out genetic conditions associated with abnormal ultrasound findings.
Rarely, amniotic fluid leaks through the vagina after amniocentesis. However, in most cases the amount of fluid lost is small and stops within one week, and the pregnancy is likely to continue normally.
Second-trimester amniocentesis carries a slight risk of miscarriage — about 0. Research suggests that the risk of pregnancy loss is higher for amniocentesis done before 15 weeks of pregnancy. During amniocentesis, the baby might move an arm or leg into the path of the needle. Serious needle injuries are rare, however. Rarely, amniocentesis might cause the baby's blood cells to enter the mother's bloodstream. If you have Rh negative blood and you haven't developed antibodies to Rh positive blood, you'll be given an injection of a blood product called Rh immune globulin after amniocentesis.
This will prevent your body from producing Rh antibodies that can cross the placenta and damage your baby's red blood cells. A blood test can detect if you've begun to produce antibodies. Very rarely, amniocentesis might trigger a uterine infection. Remember, genetic amniocentesis is typically offered when the test results might have a significant impact on management of the pregnancy.
Ultrasound Guided Amniocentesis | Jackson Hospital
Ultimately, the decision to have genetic amniocentesis is up to you. Your health care provider or genetic counselor can help you weigh all the factors in the decision.
How you prepare If you're having amniocentesis done before week 20 of pregnancy, it might be helpful to have your bladder full during the procedure to support the uterus. Drink plenty of fluids before your appointment. After 20 weeks of pregnancy, your bladder should be empty during amniocentesis to minimize the chance of puncture.
Your health care provider will explain the procedure and ask you to sign a consent form before the procedure begins. Consider asking someone to accompany you to the appointment for emotional support or to drive you home afterward.
What you can expect Amniocentesis is usually done in an outpatient obstetric facility. During the procedure First, your health care provider will use ultrasound to determine the baby's exact location in your uterus.
You'll lie on your back on an exam table and expose your abdomen. Your health care provider will apply a gel to your abdomen and then use a small device known as an ultrasound transducer to show your baby's position on a monitor. Next, your health care provider will clean your abdomen with an antiseptic. Generally, anesthetic isn't used. Most women report only mild discomfort during the procedure. Guided by ultrasound, your health care provider will insert a thin, hollow needle through your abdominal wall and into the uterus.
Pregnancy tests amniocentesis
A small amount of amniotic fluid will be withdrawn into a syringe, and the needle will be removed. The specific amount of amniotic fluid withdrawn depends on the number of weeks the pregnancy has progressed. You'll need to lie still while the needle is inserted and the amniotic fluid is withdrawn. You might notice a stinging sensation when the needle enters your skin, and you might feel cramping when the needle enters your uterus. After the procedure After amniocentesis, your health care provider will continue using the ultrasound to monitor your baby's heart rate.
You might experience cramping or mild pelvic discomfort after an amniocentesis. You can resume your normal activity level after the procedure. However, you might consider avoiding strenuous exercise and sexual activity for a day or two.
Meanwhile, the sample of amniotic fluid will be analyzed in a lab. Some results might be available within a few days.
Week Screening Pregnancy Ultrasound - Consumers - InsideRadiology
Other results might take up to four weeks. Contact your health care provider if you have: Loss of or vaginal bleeding or loss of amniotic fluid through the vagina Severe uterine cramping that lasts more than a few hours Fever Redness and inflammation where the needle was inserted Unusual fetal activity or a lack of fetal movement Results Your health care provider or a genetic counselor will help you understand your amniocentesis results.
- Should You Get Amniocentesis?
- Ultrasound Guided Amniocentesis
- Pregnancy and Prenatal Tests
For genetic amniocentesis, test results can reliably rule out or diagnose various genetic conditions, such as Down syndrome. However, amniocentesis can't identify all genetic conditions and birth defects. By around this time, the developing baby is suspended in about ml of amniotic fluid, which the baby constantly swallows and excretes.
A thin needle is used to withdraw a small amount of this fluid from the sac surrounding the fetus. The fluid is examined to obtain information about the baby — including its sex — and to detect physical abnormalities such as Down syndrome or spina bifida. Amniotic fluid samples can also be DNA tested to identify a range of genetic disorders, such as cystic fibrosis and fragile X syndrome. Discuss with your doctor or obstetrician whether amniocentesis is right for you. Problems detected by amniocentesis Amniocentesis can detect a number of chromosomal and other birth abnormalities in a developing fetus.
Down syndrome Neural tube defects, such as spina bifida Genetic disorders — amniotic fluid samples can be DNA tested to identify a range of genetic disorders, such as cystic fibrosis and fragile X syndrome. Women who may benefit from amniocentesis As a woman grows older, the risk of having a child with Down syndrome begins to increase significantly — from about one in 2, at age 20 years to one in at 40 years. Pregnant women who may be candidates for amniocentesis include: Women over the age of 40 years Victorian women aged 37 years and over are routinely offered this test Women with a family history of chromosomal abnormalities, such as Down syndrome Women who have already had children with chromosomal abnormalities Women known to be carriers of genetic disorders Women with partners who have a family history of a genetic disorder or chromosomal abnormality Women who return an abnormal 'serum screen' blood test or ultrasound examination result.
The amniocentesis procedure Before having amniocentesis, it is usual for the woman and her partner to be counselled on the risks of the procedure.
The entire procedure takes about 90 minutes. Steps involved in amniocentesis: The woman lies down and the position of the fetus and the placenta are determined by an ultrasound scan. When the doctor is sure of a safe spot, they swab the woman's belly with antiseptic and inject a local anaesthetic into the skin. Using a long, thin needle, the doctor extracts about 15 to 20ml approximately three teaspoons of amniotic fluid. This takes about 30 seconds. The fetus is checked afterwards to make sure all is well.
The doctor will advise when the results are expected. In some cases, the results may take up to three weeks. Immediately after amniocentesis You may need to wait in the surgery for around 20 minutes before leaving for home. Most women find amniocentesis to be painless, although it is recommended to continue resting for an hour or so afterwards.
Side effects of the procedure may include: