PET-CT for Elderly and Frail Patients — Is the Scan Manageable for You?

Mild confusion does not automatically rule out PET-CT. The main requirement is that the patient can lie reasonably still during the scan. A familiar family member or attendant nearby during the uptake period — when the patient waits quietly after the tracer injection — often makes a significant difference. For patients with more severe agitation, the imaging team and the referring oncologist will assess individually whether the scan is feasible and what support can be arranged.

Fasting is required before PET-CT because raised blood sugar affects how the tracer is taken up, which can reduce image quality. For patients with diabetes, this needs careful coordination between the referring doctor, the imaging centre and the patient's diabetes team — before the appointment is confirmed, not on the morning of the scan. Tell the booking team about diabetes at the first contact so that fasting instructions can be tailored to the patient's medication and blood sugar control.

The scan itself typically takes around 20 to 30 minutes inside the scanner. The total appointment is longer because the patient must wait after the tracer injection for it to distribute through the body — this uptake period usually lasts about an hour, during which the patient rests quietly. For an elderly or frail patient, the full appointment including registration and waiting is usually two to three hours. Plan the day accordingly and make sure the patient has eaten at the right time beforehand and has everything they need for a few hours away from home.

All imaging that uses radiation carries a small risk, and PET-CT is no exception. For elderly patients being assessed for active cancer, the clinical information the scan provides almost always outweighs the radiation exposure from a single scan. Your referring oncologist has made that assessment before requesting it. If you want to understand the dose in plain terms, ask the imaging team at the time of booking — they can compare it to familiar sources of background radiation.

Yes. PET-CT suites are accessible to patients who use wheelchairs, and imaging staff are trained to assist with transfers onto the scanner table. The key requirement is that the patient can lie flat and reasonably still for the duration of the scan. If lying flat is painful or not possible, tell the booking team when the appointment is arranged — they can advise whether any positioning adjustment is possible and whether the scan can still go ahead.

The referring oncologist makes the initial decision, based on the patient's clinical need, overall condition and what the scan is expected to show. The imaging centre also has a role — they will ask about the patient's ability to fast, their mobility needs and any other conditions that could affect the scan. If you have concerns about whether the patient can manage it, raise them with the referring doctor before the appointment is confirmed. There is no blanket age cutoff, and every decision is made individually. CION coordinates PET-CT through partner imaging centres; your care team will guide you on where the scan will take place.