What should you know about FNB fine needle biopsy?

A clinician guides the needle into a lump, nodule, lymph node, or other area that needs assessment. The sample may be collected through the skin, sometimes with imaging guidance. A local anaesthetic may be offered, and pressure or brief discomfort can occur during sampling. The laboratory examines the cells and may use additional tests such as immunohistochemistry to identify features that help classify an abnormality.

An FNB can show whether sampled cells look benign, suspicious, or malignant, but a small sample does not always answer every question. The report is interpreted alongside examination and scans, such as an MRI Scan, when relevant.

Tell the team about medicines that affect bleeding, allergies, pregnancy, and previous reactions to local anaesthetic. Follow the clinic's instructions about eating, drinking, and taking regular medicines. Afterward, keep the area clean and follow advice about activity. Ask when the result is expected and how it will be explained. Further testing, genomic tumour profiling, or a larger biopsy may be suggested if the sample is too small or more detail is needed.

Contact the treating service promptly if bleeding does not settle with firm pressure, swelling is increasing, pain is worsening, or the site becomes hot, red, or drains fluid. Seek urgent medical help for trouble breathing, fainting, sudden weakness, or severe illness after the procedure.

Ask which area will be sampled, whether imaging guidance is needed, what the possible report categories mean, and whether the result could change the next treatment step.