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Departments often have formulas that give the amount of contrast needed for various investigations, using patient sex and weight as main parameters. These may include creatitine levels as well, and in such cases it can help to get a value of of much contrast would hypothetically have been given if the creatinine level was normal, such as for example 80 μmol/L or 0.9 mg/dL. This value can be compared to how much can actually be given in order to determine if it is worth doing the exam with contrast.
→How much contrast is needed: Not depending on renal function
*{{cite journal|last1=Nyman|first1=Ulf|title=Contrast Medium-Induced Nephropathy (CIN) Gram-Iodine/GFR Ratio to Predict CIN and Strategies to Reduce Contrast Medium Doses|year=2012|doi=10.5772/29992}}</ref> ||colspan=2| 20 ml<ref name=Angiography group="notes"/> || When using specific low-contrast protocol.<ref name=Angiography group="notes"/>
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