Contraindications to CT Angiography in Patients Undergoing V/Q Scans in 2015
| Contraindication | Number |
| None | 7 (2.7%) |
| Acute kidney injury or chronic kidney disease | 121 (46.0%) |
| Contrast allergy | 18 (6.8%) |
| Pregnancy | 6 (2.3%) |
| Metformin therapy not stopped | 2 (0.8%) |
| Intravascular hypovolemia | 1 (0.4%) |
| Pulmonary hypertension | 99 (37.6%) |
| Heart transplant | 2 (0.8%) |
| Nondiagnostic CT angiography | 7 (2.7%) |
| Total | 263 (100%) |