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CT - General Preparations

  1. Patients are required to bring previous X-ray, MRI, or CT films for comparison.
  2. Please arrive 15 minutes prior to your appointment for registration.
  3. Contrast agents are often used in CT exams to better define the blood vessels and to enhance the appearance between different tissues. Iodinated intravenous contrast agent is given through an intravenous needle. If a contrast medium is administered, the patient may be asked to fast for about four hours prior to the procedure.
  4. Please inform our staff if there is any possibility of PREGNANCY or history of allergic reactions before the examination. Radiation exposure from a CT scan is a risk to the foetus of a pregnant women.
  5. For diabetic patients on Metformin medication, stop Metformin before the procedure and wait 48 hours to restart, for details please ask our duty radiographer or nurse. Patient with normal renal function can resume Metformin in 2 days (48 hours) after contrast administration. Patient with impaired renal function, there is increased risk of further impairment of renal function, patient should withhold Metformin and go back to your doctor to reassess renal function.
  6. If you have history of allergy or asthma, you may be required to take oral steroid at least 24 hours pior to examination and repeat same dose in the morning of the day of examination.