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At moderate weight deviations, corrections can be made by adjusting contrast dose proportionally to patient weight. Still, the needed dose is actually proportional to the ''lean body weight'' of the patient. For both men and women weighing more than about 85 kg,<ref group="notes">At above this weight, calculated contrast amount with the Boer formula deviates more than 10% from both the weight-unadjusted amount, as well as the amount taken proportionally to the weight, for both men and women.</ref> contrast dose is optimally calculated by the Boer formula, using height and weight of the patient.<ref name="CarusoDe Santis2018">{{cite journal|last1=Caruso|first1=Damiano|last2=De Santis|first2=Domenico|last3=Rivosecchi|first3=Flaminia|last4=Zerunian|first4=Marta|last5=Panvini|first5=Nicola|last6=Montesano|first6=Marta|last7=Biondi|first7=Tommaso|last8=Bellini|first8=Davide|last9=Rengo|first9=Marco|last10=Laghi|first10=Andrea|title=Lean Body Weight-Tailored Iodinated Contrast Injection in Obese Patient: Boer versus James Formula|journal=BioMed Research International|volume=2018|year=2018|pages=1–6|issn=2314-6133|doi=10.1155/2018/8521893}}</ref> Taking this formula, the needed volume of IV contrast from the unadjusted volume given in the table above becomes:

[[File:Diagram - weight.png|thumb|Boer formula for volume of contrast in a normal height patient if having received 60 ml if weight was normal.<ref group="notes">176 cm male and 162 cm female</ref>]]

Still, it is generally enough to make a rough estimation of the needed contrast, since there are for example inherent standard deviations in the usage of creatinine or cystatin C in calculating GFR.

===Treating risk factors===

Risk factors can sometimes be treated or at least mitigated, especially if having suddenly appeared, such as a decreased renal function when it was previously normal. In such cases a common easily treated cause is dehydration.

===Adjust radiation===