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CAT Scan of the Abdomen

Patient Instructions 

St. Mary's Regional Medical Center
Dept. of Imaging Services 

(207) 777-8482

A CT of the abdomen with contrast may require the use of both oral and IV contrast so that good images can be obtained.  (If you have a computer, you may want to read more about this type of exam at RadiologyInfo website.

If you are 60 years old or older, a Creatinine lab test will need to be done BEFORE your CT exam. This creatinine test should also be done if you have a history of renal disease, diabetes (type I or II), renal cell carcinoma, multiple myeloma, or have only one kidney.  Test results within the last 6 weeks prior to your CT exam are acceptable.  

If you have diabetes and taking any of the metformin formulas listed below, please do not take the morning dose on the day of your CT exam.

Brand Name (Generic Name) 

  • Actoplus MET (pioglitazone/metformin)
  • Avandamet (rosiglitazone/metformin)
  • Fortamet (metformin)
  • Glucophage (metformin)
  • Glucophage XR (metformin)
  • Glucovance (glyburide/metformin)
  • Glumetza (metformin)
  • Invokamet (canagliflozin/metformin)
  • Janumet    (sitagliptin/metformin)
  • Jentadueto (linagliptin/metformin)
  • Kazano (alogliptin/metformin)
  • Kombiglyze XR (saxagliptin/metformin)
  • Metaglip (glipizide/metformin)
  • PrandiMet (repaglinide/metformin)
  • Riomet (metformin)
  • Xigduo XR (dapagliflozin/metformin)

Here are the steps to follow before your exam:

  1. Obtain the oral contrast called Omnipaque 240 from your doctor's office or from the Radiology Department at St. Mary's Regional Medical Center. Store the package in a cool, dark place overnight.
  2. On the day of your CT exam, DO NOT eat any solid foods during the 4 hours before your exam. You should drink extra water.
  3. One and half (1 ½) hours before your appointment time, pour one 50 ml unit dose bottle of Omnipaque 240 into 32 ozs. (4 cups) of cold water.
  4. Start drinking. - Suggestion: Use water with Crystal Light dissolved in it. (orange or lemon flavor)
  5. One hour before your appointment time, DRINK all of the liquid mixture.
  6. Please finish drinking all the liquid one hour before your CT appointment time.
  7. You can take your routine medications.
  8. Bring a list of your medications with you and give the list to the CT Technologist.
  9. If you have any questions, call St. Mary's Regional Medical Center's Radiology Department at 207-777-8482.

Revised 4/15/15 DMK

St. Mary's Health System • 93 Campus Avenue • Lewiston, ME 04240