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Risks Associated With FDG & PET Scans

A PET scan (Positron Emission Tomography) with FDG (fluoro-D-glucose) is an imaging scan that creates a three-dimensional image of the body. This scan is used primarily for detecting cancers, but can also be used for cardiac and neurological diseases. This treatment is a non-invasive alternative to traditional biopsies and can detect the rapid growth of cancer cells better than CT, MRI or ultrasound exams.

  1. Risks Associated with the Scan

    • According to PETNET Solutions, "the risks associated with a PET scan are very minimal." The radiopharmeceutical used is a radioactive form of glucose, a naturally occurring substance in the human body. This substance can be easily eliminated from the body either through radioactive decomposition or excreted through the urine. Over 90 percent of the radioactive material has either decomposed or left the body before the patient even leaves the clinic because the amount of radiation is very low. This procedure is even safe for diabetics who must control their glucose. A minor risk of the procedure, according to WebMD, is that patients may experience temporary soreness or redness in their arms where the IV was inserted.

    How to Prepare for the Scan

    • The procedure is performed as an outpatient one unless the patient has already been admitted to the hospital. Preparation usually includes restrictions on food and water and a thorough review of any medications, including over-the-counter medications and naturopathic medications. Patients who are currently on insulin therapy are usually given more specific instructions on glucose intake. A urinary catheter may also be placed in the bladder, depending on where the scan will focus.

    What to Expect During the Scan

    • The FDG is administered through an IV, or intravenous line, and takes about 45 minutes to an hour to absorb into the body. Once it is absorbed, the scan can begin and usually takes anywhere from 30 to 60 minutes. During the scan the patient will need to remain completely still for the most accurate images. The whole process from check-in to check-out can take up to four hours to complete.

    Scan Results

    • PET scan results are read by radiologist with specialized training. Once they review the scan and dictate a report, the results can be forwarded to the ordering doctor and discussed with the patient. This can take anywhere from one to three days. A follow-up appointment is usually set for the patient to come back to the doctor's office to review the results and discuss future treatments and prognoses.

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