==Preparation==
Ability to aspirate from the catheter can optionally be tested.
*Contrast should be non-ionic,<ref name="KnutstadHager2016"/> with an iodine concentration of at least 270 mg/ml.<ref name=Helsingborg/>
*Syringe can be for example 10 ml or 20 ml, for injection by hand.<ref name="KnutstadHager2016"/> For pumps in ports, the pressure should not exceed >40psi (275kPa or 2,75bar).<ref name=Helsingborg/>