During the fine-needle aspiration biopsy, you lie on your back. The aspiration biopsy is not any more painful than venous blood sampling and takes less than a minute. After an explanation, you sign a patient consent form. The tissue biopsy is carried out using a syringe with a max. 0.9-millimetre-thin needle, using sonographic testing. Afterwards, you must put pressure on the puncture site for ten minutes using a swab.