Fast result. It is fast and informative procedure, not very painful in good hands. Smears can show benign or malignant findings.
Don't stress. Fine needle biopsy of breast is very tolerable and is done often without local anesthetic. A small gauge needle is placed into a nodule and material is removed. It takes about 5 seconds. Studies have shown the most critical factor in fna reliability is the training and experience of the operator. Ideally, the operator can use a microscope to check the sample for adequacy.