Table 2.

The 3D-PAST risk assessment model with assigned scores.

Risk Assessment Model
Variables	Values	Point
		(Total Score: 14)
Deep vein thrombosis history	Yes	+2
High D-dimer on admission	>500–2000 ng/mL	+2
Very high D-dimer on admission	>2000 ng/mL	+5
Pulmonary embolism history	Yes	+2
Low Albumin	<3.5 g/dL	+1
Systolic blood pressure	<120 mmHg	+1
Tachycardia	>100 bpm	+1

3D-PAST risk assessment mode score is delineated as DVT History = 2; High D-Dimer (>500–2000 ng/mL) = 2; Very High D-Dimer (>2000 ng/mL) = 5; PE History = 2; Low Albumin (<3.5 g/dL) = 1; Systolic Blood Pressure <120 mmHg = 1; Tachycardia (heart rate >100 bpm) = 1.