Late in the pregnancy, lung maturity can be determined using this test. The skin of the abdomen is scrubbed and a topical anesthetic may be applied, or a local anesthetic may be injected into the skin. A long, thin needle is inserted through the abdomen and into the uterus. How The Test Will Feel If an anesthetic is used, there may be a sharp, stinging sensation for a few seconds. When the needle enters into the amniotic sac, a sharp pain lasting a few seconds may be felt.
Some women have the sensation of pressure in the lower abdomen when the fluid is withdrawn.
After the procedure there may be some minor cramping. This test does not require an overnight stay in the hospital. You must sign a consent form. Your bladder must be full for the ultrasound . There are no food or fluid restrictions.