Generally speaking, a kidney can undergo contrast imaging if it has normal renal function; if it has renal insufficiency, contrast imaging is not recommended.
Imaging is for structures or organs that lack natural contrast, substances of higher or lower density than the structure or organ can be introduced into the organ or its surrounding interstitial space to produce contrast visualization, including coronary angiography, enhanced CT, and so on.
Most patients with one kidney have compensable renal function, with blood creatinine, urea nitrogen, and uric acid within the normal range. Generally speaking, one kidney with normal renal function is able to do contrast imaging; contrast agent is mostly excreted through the kidneys, and it is not recommended to do contrast imaging for patients with renal insufficiency.
Patients with one kidney should go to the hospital if they need to do imaging under the guidance of professional physicians.