==Risk factors==
In Swedish practice<ref>{{NU Hospital Group}}</ref> the standard risk factor questions include presence or absence of:
*Renal or urinary disease*Diabetesand heart disease. These are aggravating factor in low renal function (see [[CT with IV contrast in low renal function]])
*Thyroid disorders
*Renal or urinary disease
*Heart disease
*Myasthenia gravis