Table 3.

The comparison of the results of D-dimer test, electrocardiography (ECG), echocardiography, and the Doppler ultrasound of lower extremities in patients suspicious to pulmonary embolism (PE)

Requested tests		Proven PE [n (%)]	Without PE [n (%)]	P*
D-dimer (n = 47)	High level	11/11 (100)	20/36 (55.5)	0.009
	Normal	0 (0)	16/36 (44.5)
ECG (n = 353)	In favor of PE	51/80 (63.7)	123/273 (45.1)	0.003
	Normal	29/80 (36.3)	150/273 (54.9)
Echocardiography (n = 269)	In favor of PE	16/66 (24.2)	23/203 (11.3)	0.015
	Normal	50/66 (75.8)	180/203 (88.7)
CDS (n = 151)	In favor of PE	25/47 (53.2)	31/104 (29.8)	0.010
	Normal	22/47 (46.8)	73/104 (70.2)

^*Chi-square test

PE: Pulmonary embolism; ECG: Electrocardiography; CDS: Color Doppler sonography