In this article:
What is Amniocentesis?
Amniocentesis is a prenatal test in which a small amount of amniotic fluid (fluid protecting the baby) is gently removed for laboratory testing. This fluid contains cells and substances that help doctors check for certain genetic conditions and birth defects (congenital disorders) in the foetus before birth. This test is usually conducted in the second trimester (between weeks 15 and 20 of pregnancy). In some cases, it may also be performed in the third trimester.Why is Amniocentesis Done?
Your doctor may recommend amniocentesis during pregnancy for several reasons, such as:- Genetic testing: To check the baby’s DNA for conditions like Down syndrome or other genetic disorders, especially if earlier screening shows a higher risk.
- Chromosome testing: To detect birth defects, such as spina bifida, or other genetic abnormalities.
- Diagnosis of foetal infection: To detect infections or illnesses that may affect the baby.
- Foetal lung maturity: In rare cases, it is necessary to see if the baby’s lungs are developed enough when early delivery is planned.
- Treatment purposes: To drain excess amniotic fluid (polyhydramnios) if it builds up in the uterus.
- Other medical reasons: Your doctor may suggest the test for specific health concerns during pregnancy.
When is Amniocentesis Usually Recommended During Pregnancy?
Your healthcare provider may suggest amniocentesis if:- Your prenatal screening indicates an increased chance of a chromosome disorder.
- Your ultrasound shows possible signs of a birth defect.
- You are identified as a carrier of a genetic condition.
How is the Amniocentesis Procedure Performed?
Before the Procedure
Your healthcare provider will explain the test and ask for your consent. You may be asked to change into a gown and lie on an exam table. Your blood pressure, heart rate, and breathing may be checked. An ultrasound helps locate your baby, the placenta, and a safe pocket of amniotic fluid. Your belly will then be cleaned with an antiseptic.
During the Procedure
You will be asked to lie on your back while your healthcare provider continues to monitor your baby with an ultrasound. A thin, hollow needle will be gently inserted through your abdomen into the uterus. Most women feel mild cramping or pressure, and some feel a quick sting when the needle is inserted. A small amount of amniotic fluid will be taken into a syringe, and then the needle will be removed. The amount of amniotic fluid taken is very small, and your body will naturally replace it.
After the Procedure
Your healthcare provider will check your baby’s heartbeat on the ultrasound and monitor your vital signs. A bandage will be placed on the needle site, and if you’re Rh negative, you may receive an injection (Rhogam) to prevent blood-related complications. You may feel some cramping or soreness after the procedure. Rest is usually advised for 24 hours, and you should avoid heavy activity. The sample is then sent to a lab, where it is tested for genetic conditions, birth defects, or infections. Some results may be ready in a few days, while others may take several weeks.
NOTE: Contact your healthcare provider immediately if you notice:
- Changes in your baby’s movements
- Bleeding
- Severe uterine cramping that lasts for long hours
- Fever
- Fluid leakage through the vagina
- Unusual vaginal discharge
- Redness or swelling at the site where the needle was inserted
What do Amniocentesis Test Results Mean?
Your healthcare provider or a genetic counsellor will help you understand your test results.If the test is negative, it means your baby does not have the specific disorder tested for. However, it does not guarantee that your baby is free from all genetic conditions.
If the test is positive, it means your baby has the disorder that was tested for. Your healthcare provider or counsellor will explain what this means and discuss your options.
Amniocentesis provides insights into certain genetic conditions, like Down syndrome. But it cannot detect every genetic condition or birth defect. Your healthcare team will support you through understanding the results and making informed decisions.
What are the Risks of the Amniocentesis Test?
Amniocentesis is generally safe, but like any procedure, it carries some risks. These include:- Infection: Uterine infection may occur, though it is extremely rare. If you experience a fever, report it to your doctor immediately.
- Miscarriage: The risk is low, approximately 0.1–0.3%, when performed after 15 weeks by an experienced provider. The risk is higher if done earlier.
- Needle injury: Very rarely, the needle may touch the baby. Serious injuries are uncommon.
- Amniotic fluid leakage: In rare cases, fluid may leak from the vagina. In most cases, it stops within a few days without affecting the pregnancy.
- Rh sensitisation: If you are Rh negative, the baby’s blood cells may enter your bloodstream. You may receive an Rh immune globulin injection to prevent complications.
- Cramping or mild bleeding: Some discomfort, cramping, or light bleeding may occur after the procedure.
- Transmission of infection: Rarely, existing infections (like hepatitis C, HIV, or toxoplasmosis) may pass to the baby.
Amniocentesis helps you understand your baby’s health before birth. The test is usually safe, but like any other procedure, small risks exist. Amniocentesis can detect certain genetic conditions and birth defects. However, it is important to remember that it cannot detect all genetic or congenital conditions. Your healthcare team will always be there to guide you, answer questions, and support your decisions.
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FAQs on Amniocentesis Made Easy: A Simple Guide for Expecting Parents
- What to avoid after amniocentesis?
It is recommended to avoid strenuous activities, such as exercise, heavy lifting, or physical intimacy, for at least 24-48 hours after the test. - Is amniocentesis painful?
You may feel a mild sting or pinch when your healthcare provider is inserting the needle for sampling. You may also experience mild cramping during the procedure. - Is amniocentesis banned in India?
Yes, amniocentesis was banned in India in 1994. This procedure was banned under the Preconception and Prenatal Diagnostic Techniques (PCPNDT) Act. The reason behind this ban was that the test could disclose the sex of the foetus. In many regions, a female child was not socially accepted, leading to frequent termination of pregnancies. To curb this practice, the government imposed a ban on amniocentesis.