Cystatin and Early AKI Detection Contrast Induced Acute Kidney Injury

Inclusion Criteria: * Subjects ages 18 years and above * Inpatients with CKD (Figure 1) * Order for CT imaging study or coronary angiography with isohexol Omnipaque) contrast media. * Pre and post contrast available * All races and ethnicity of patients are eligible. We expect to analyze approximately equal number of men and women in this study. Exclusion Criteria: * Preexisting dialysis * Patients under the age of 18 years * Pregnancy * Incarcerated individuals * Patients with impaired cognition and unable to follow consent procedures * Recent exposure to CM (within 2 days before/after procedure) * Cardiac shock * Medications that affect biomarkers, including corticosteroids, lfamethoxazoletrimethoprim