Each segment of vein identified must be assess as compressible and noncompressible
Touching of the anterior and posterior walls indicates a normal exam
No touching with pressures sufficient to deform the artery indicates<unk> 
Touching of the anterior and posterior walls indicates a normal exam
No touching with pressures sufficient to deform the artery indicates<unk>
DVT ultrasound
Ankle-brachial index
Thromboelastography 
IVC ultrasound
D-dimer
Aortic ultrasound
Bubble study
Age adjusted D-dimer