- The patient must hold their head still and not swallow during the puncture.
- For the cytology biopsy, the sample is taken without aspirating. The capillary action of the needle alone collects the best material for cytology testing.
- The needle is located in the tumor and moved in an out in the same plane.
Normally, there are two to four punctures made in the area to be tested. The exception is when it is necessary to aspirate and/or use a thicker needle (23 G) to, for example, drain a cyst or when there is fibrosis in the thyroid gland.
It is recommended that a diagnostic sample contain at least six groups of follicle epithelial cells in each of at least two punctures.
If there are cysts, as much fluid should be evacuated as possible. A cell sample from the remaining lesion should be taken if necessary (without aspiration).
All cyst fluid should be examined (make at least 2-6 smears of fresh fluid).
The material should be immediately smeared on a slide to avoid coagulation. The slide should be air-dried, fixed, and stained.
For the histology biopsy, the skin area is washed and the procedure is carried out aseptically. After placing the local anesthesia using US guidance, a small incision is made to insert the larger needle. When the point of the needle is in the correct position, the shooting mechanism is triggered and the sample is taken automatically. Because local anesthesia is given, the procedure usually does not cause any discomfort.