Aminocentesis is a test done during pregnancy. In this test, a needle is injected to remove a small amount of fluid from the sac. This is done to check if the baby has any defects and chromosomal problems. This test is also known as culture- amniotic fluid or culture- amniotic cells. This test is done on an outpatient basis. In this, mothers are not needed to stay in the hospital. The doctors find the exact location of the baby by ultrasound.
For the preparation of this test the bladder of the mother should be full for the pregnancy ultrasound. There is no restriction on having food or drink just before the procedure. Mother may need to provide a blood sample to determine her blood type and also her Rh factor. If mother is Rh negative then she may get an injection of a medicine called Rhogam. It is really important to know the benefits and risks involved in this test. Doctor will suggest you this test only if you are willing to have this. After knowing the advantages and disadvantages doctor will give you a consent form to sign and after that only he will start the procedure. This test should be done with full knowledge as it has risks like miscarriage, leaking of amniotic fluid, infection or injury to the baby, vaginal bleeding etc.
If use of anaesthetic is done then mother will feel a stinging and sharp sensation just for few seconds. When the procedure starts and needle enters the amniotic sac, mother may feel a sharp pain for few seconds. Some women feel pressure in the lower abdomen when doctor pulls out the fluid. Mothers can feel minor cramping after the procedure. This test is done to check whether the baby in the womb is ok or not. It is done to find out chromosomal and genetics problems. It is helpful as parents can prepare for the needs of the baby. This test is also done to determine that baby’s lungs are strong or developed enough or not if there is a condition that requires early or premature delivery.
Before the procedure starts, a doctor gives local anaesthesia to the mother to reduce the pain during the insertion of the needle and also when the fluid is injected from the sac. When anaesthetic starts working a needle is inserted in the abdominal wall of the mother, then through the wall of the uterus and in the last in the amniotic sac. With the help of the ultrasound guidance the doctors puncture the area away from foetus and takes out about 20ml of the amniotic fluid. These cells are then grown in the culture medium, then fixed and stained. After this abnormalities are checked out by the microscope.