Abdominal PET scan: what to expect

It can help locate active disease, assess how far a known cancer has spread, guide treatment planning or evaluate response. An unusual area on PET is not a diagnosis by itself because inflammation, infection and normal organ activity can also take up tracer.

A small amount of radiotracer, commonly FDG, is given through a vein. After a quiet uptake period, the scanner detects where it has collected. PET is commonly paired with CT so metabolic findings can be matched to structures such as the liver, bowel, lymph nodes and other abdominal tissues.

The report describes the location and pattern of uptake and compares it with earlier imaging when available. Your clinical team interprets that pattern with symptoms, examination findings and other tests; some findings need follow-up imaging or a biopsy.

Follow the imaging centre's instructions about food, drinks, medicines and activity. Tell the team beforehand if you have diabetes, kidney problems, allergies, difficulty lying flat, possible pregnancy or are breastfeeding. Blood glucose may be checked because it can affect FDG distribution.

Wear comfortable clothing without metal and bring your medication list and previous scans if requested. During uptake, rest quietly and keep warm. The scan itself requires lying still; ask in advance about support if pain, anxiety or claustrophobia may make that difficult.

Most people can resume usual activities after the imaging team releases them. Follow their advice about fluids, close contact with pregnant people or young children, and any CT contrast precautions.

Seek urgent medical help for trouble breathing, swelling of the face or throat, faintness, or a rapidly spreading rash after an injection. Contact the imaging service if the injection site becomes increasingly painful, red or swollen, or if you are unsure how to manage diabetes medicines after fasting.

Ask what clinical question the scan is intended to answer, whether CT contrast will be used, how to adjust medicines while preparing, when the report should be available and what further test might be needed if uptake is unclear.