In this exploratory study we explore the use of Shear Wave Elastography to differentiate between Acute Kidney Injury after vascular surgery and among the healthy population.

Inclusion Criteria:

• No history of diabetes or hypertension
• Estimated Glomerular Filtration Rate > 60 ml/min/m^2
• Structurally normal kidney on renal ultrasound
• BMI < 27 kg/m^2

Exclusion Criteria:

• Prisoners directly admitted from a correctional facility
• Children < 19 years or under 50 kg body weight if age is unknown
• Patients with end stage renal disease or preexisting glomerular filtration rate less than or equal to 30 mL/min/1.73 m^2 or need for dialysis
• Patients with end stage heart disease on the cardiac transplant list
• Patients undergoing procedures without vascular surgery
• All transplant patients
• Patients on ventricular assist devices
• Patients undergoing emergency procedures
• Patients with body mass index > 27kg/m^2
• Any condition that would impede visualization of the kidneys by ultrasound