Doppler Ultrasound images of validation testing of OMNA Tourniquets that show the effectiveness and safety of our tourniquets. Red indicates arterial blood flow, and Blue indicates venous blood flow. The test was performed by an Ultrasound Technologist (RVT), and signed by a Medical Doctor (MD). The first image shows normal arterial and venous blood flow of the right femoral artery before Tourniquet application. The second image shows 100% arterial and venous occlusion when the OMNA Tourniquet is applied. The third image shows the return of normal arterial blood flow once the Tourniquet was removed. To learn more, and see more tests go to the FAQs page.