In hospitalized patients with significant lower extremity edema, how can you integrate bedside POCUS findings with clinical assessment to guide the decision to start empiric anticoagulation for suspected DVT before formal imaging?  

Great question!  Especially if the significant lower extremity edema is asymmetric it sounds like your clinical suspicion would be quite high. When you order a "duplex" study the sonographer is using 2d ultrasound (aka B mode...white dots on black screen) + doppler ultrasound (color and spectra...