Dharamshila Narayana Superspeciality Hospital

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Guidelines for PET CT Scan Test

General Instuctions to Prepare for the Exam

  • You are requested to arrive ½ hour before your appointment time with an attendant at the Diagnostic Imaging Front Desk.
  • You are requested to bring Imaging Consultation form for the test.
  • You are requested to deposit the cost of Radiopharmaceutical (medicine) in advance for the test.
  • You are requested your earlier reports, investigations, films and CD on the day of examination.
  • Wear loose and comfortable clothes without any metal hooks, zipper and also carry spare set of clothes with you.
  • Do not wear any jewellery and ornaments of metal or non-metal on the day of examination.
  • Do not bring children or pregnant women along with you.
  • Avoid any heavy exercises a day before your test.
  • The patient will require having 4 – 6 hours of fasting before the examination. The patient may take plain water.
  • You can take your prescribed medicine after consultation with your doctor, with plain water only.
  • Please carry your diabetic, hypertensive medicines with you, if any.
  • The blood sugar level must be controlled before the test. In case of abnormal blood glucose level on the time of test, the appointment will be cancelled and medicine cost deposited in advance will not be refunded as the hay life of medicine is 2 hours approx.
  • In case of cancellation of appointment, you are requested to inform 24 hours before the appointment time.
  • You are requested to follow the instructions given by the medical and paramedical practitioners at the time of investigation.
  • You will be administered prescribed amount of radioactive tracer (medicine) through IV cannula for the scan.
  • You will be advised to be rested for about 45 – 60 minutes in the isolation room after the injection of the medicines. During that period you are requested not to talk, read and move unnecessarily so that the medicine can be absorbed properly.
  • You can use the Toilet located in Nuclear Medicine Section.
  • You are requested not to leave the room without the permission of the staff.
  • After the test the patient can resume the normal activity and normal diet.
  • It is advisable to drink plenty of water after the test and empty bladder frequently.
  • The hospital or department is not responsible for cancellation / rescheduling of the examination due to technical reason or non-delivery of the radiopharmaceuticals (medicines) from the source.


  • Drink plenty of water, being well hydrated is important but starting morning, you should not have any sugary food or drinks. For example, avoid fruit, fruit juice cold drinks, candy and desserts etc.
  • Have no food or any other sugary drink (except plain water) for 6 hours before your appointment time.
  • Do not smoke for at least 24 hours and Do not drink coffee / tea for at least 12 hours before scan.
  • If you have prescription medicine to take before your scan, take it only with plain water.


Your scan will be scheduled for the middle of the day. Have light breakfast with your normal diabetic medicine in the morning. During the 4 hours before your appointment time, do not have anything else except water, not even insulin. DIABETICS MUST bring their insulin or pills (medicine). Blood sugar will be checked before scan. Scan may be cancelled, if blood sugar level is not within permissible limits.

What to Expect at the Time of PET CT Scan Test

  • A nurse / technician will place a small IV cannula in your arm.
  • You will be escorted to a room where you will be given a prescribed amount of a radioactive tracer (medicine) for the scan. You will rest for about 45 – 60 minutes while the medicine travels through your body. During this time DO NOT talk, read or move unless you want to go to the bathroom or here I an emergency. During the resting period you will be under electronic surveillance by the medical staff.
  • You will then be brought to the PET CT Scanner Room. The actual scan will take less than one hour.
  • Total time you will be here is approximately 2 – 2 ½ hours.
  • After the doctor checks the scan, you may leave and continue with your regular activities.

Post Your Query

Call 186-0208-0208
Mon–Sat 9:00 AM to 6:00 PM IST