Table 2.

PERC criteria for the patients with suspected PE

1.Item		No
		n	(%)
1	Age ≥ 50 years	230	(65.2)
2	Heart rate ≥ 100	182	(51.6)
3	Oxygen saturation on room air < 95%	275	(77.9)
4	Unilateral leg swelling	335	(94.9)
5	Hemoptysis	338	(95.8)
6	Recent surgery or trauma	318	(90.1)
7	Prior PE or DVT	300	(85.0)
8	Hormone use	346	(98.0)
Overall		49	(13.9)

PE pulmonary embolism, DVT deep vein thrombosis