 Find needle aspiration cytology involves using a thin hollow needle to remove samples of cells from tissue or fluid in an organ or a lump. Pre procedure, please inform your doctor if you are on blood thinners. During the procedure, you are given a hospital gown to change into and settled comfortably in a private area throughout. A thin hollow needle with a syringe is gently inserted through the skin into the lump or organ and some of the cells are sucked into the needle. If the lump is very small, a scanning machine is used to guide the needle to the right place. The needle is gently removed and your doctor may apply some pressure to stop any bleeding. Final results are available in about two days and the same sample can later be used as cell block material for high-end molecular studies.