NAVAL Score of de Bastos et al for Predicting the Risk of Hospital-Acquired Venous Thrombosis

Description

de Bastos et al developed the NAVAL score for identifying a hospitalized patient at risk for venous thrombosis. A patient at risk may benefit from closer monitoring and more aggressive management. The authors are from multiple hospitals in Brazil including Hospital Naval Marcilio Dias in Rio de Janeiro.

Patient selection: hospitalized patient

Parameters:

(1) age in years

(2) history of thrombophilia

(3) history of a previous venous thrombosis

(4) admission to surgical ward

Parameter	Finding	Points
age in years	< 60 years	0
	>= 60 years of age	1
history of thrombophilia	no	0
	yes	3
history of thrombosis	no	0
	yes	3
surgical patient	no	0
	yes	1

where:

• The cutoff for age is described as "under 60" and "over 60".

total score =

= SUM(points for all 4 parameters)

Interpretation:

• minimum score: 0

• maximum score: 8

• The higher the score the greater the risk for hospital-acquired venous thrombosis.

Total Score	Risk Group	Probability of VT Event
0	low	0.1%
1	moderate	0.3%
2	moderate	1%
3 to 8	high	19.4%

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NAVAL Score of de Bastos et al for Predicting the Risk of Hospital-Acquired Venous Thrombosis

Description

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