A 58-year-old male patient with acute dyspnea is assessed in the emergency department using the BLUE protocol. The scan reveals no significant lung pathology (A-profile) but prompts the consideration of deep vein thrombosis (DVT). This rapid assessment aids in detecting DVT to prevent potential complications like pulmonary embolism.

Here’s how you perform a DVT POCUS scan: 

1. Position the patient supine with the leg in extension and exorotation.
2. Start scanning at the level of the inguinal crease with a linear transducer. For the popliteal position, the leg is flexed to allow scanning of the fossa. 
3. Slowly scan distally and assess compressibility every 1-2 cm. 

It is impossible to compress a thrombosed vein.

 4. Pay special attention to 5 visualization key points since these are more likely for visualizing clots. 

• Common femoral vein.
• Bifurcation of the common femoral vein and the saphenous vein.
• Bifurcation of the common femoral vein and the lateral perforator vein. 
• Bifurcation of the superficial femoral vein and the deep femoral vein.
• Popliteal vein. 

5 key scanning points for DVT visualization. CFV, common femoral vein; GSV, great saphenous vein; SFA, superficial femoral artery; DFA, deep femoral artery; SFV, superficial femoral vein; DFV, deep femoral vein; PA, popliteal artery; PV, popliteal vein. 

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