Table 4.

Distribution of CTPA and D-dimer results by Wells rule and Geneva score.

CDR	Study population	CTPA			D-dimer
		Patients (N=)	Pos (%)	Neg (%)	N = 173	Pos (%)	Neg (%)
Low risk	Wells rule (<2)	176	10 (5.6%)	166 (94.4%)	32	9 (28.1%)	23 (71.9%)
	Geneva score (<4)	158	9 (5.6%)	149 (94.4%)	35	8 (22.9%)	27 (77.1%)
Intermediate risk	Wells rule (2–6)	502	53 (10.3%)	449 (89.7%)	119	51 (42.9)	68 (57.1%)
	Geneva score (4–10)	683	95 (13.9%)	588 (86.1%)	119	37 (31.1%)	82 (68.9%)
High risk	Wells rule (>6)	216	56 (30.0%)	160 (70.0%)	22	14 (63.6%)	8 (36.4%)
	Geneva score (>10)	53	22 (41.3%)	31 (58.7%)	19	12 (63.2%)	7 (36.8%)