Chan et al reported the LEFt clinical decision rule for the diagnosis of deep vein thrombosis (DVT) in a pregnant or recently pregnant woman. This can help to identify a woman in whom a DVT can be excluded clinically.
Criteria for DVT on B-mode compression ultrasonography:
(1) lack of compressibility of a deep vein
(2) absence of Doppler flow in iliac vein
(3) direct visualization of a thrombus
Features:
(1) symptomatic/suspicion of thrombus on left side (L)
(2) edema (E) with >= 2 cm difference in calf circumference between left and right side
(3) presentation during first trimester (Ft)
Parameter
Finding
Points
side suspected
left
1
right
0
bilateral
0
edema
absent
0
present
1
presentation
first trimester
1
second trimester
0
third trimester
0
total score =
= SUM(points for all 3 parameters)
Interpretation:
• minimum score: 0
• maximum score: 3
• A score of 0 excludes deep vein thrombosis.
Score
Presence of DVT
0
0%
1
5%
2
29%
3
50%
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