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==Example==
As a fictional example, an obese 50 year old male has undergone gastric bypass surgery two days before and has now developed abdominal pain and diarrhea. This is an indication for CT with IV (and oral) contrast.<ref name="LevineCarucci2014">{{cite journal|last1=Levine|first1=Marc S.|last2=Carucci|first2=Laura R.|title=Imaging of Bariatric Surgery: Normal Anatomy and Postoperative Complications|journal=Radiology|volume=270|issue=2|year=2014|pages=327–341|issn=0033-8419|doi=10.1148/radiol.13122520}}</ref> GFR is estimated to be 30 31 ml/min.
Medical records are checked for additional risk factors, finding diabetes, probable dehydration and anemia. The patient took metformin, but not since the day before surgery. Based on a ratio of maximum 1 g iodine/(ml/min of GFR) and a local iodine concentration of 350 mg/ml, the amount that can be given is:
*2.9 ml * 30 31 = 87 90 ml
With the local iodine concentration being 350 mg/ml, the weight-unadjusted volume needed for the abdominal CT is 60 ml. The patient weights 120 kg and is 176 cm tall. The weight adjusted volume is thus:
