Table 3.

Results of MRA and Combined MRA and MRV, by Reference Test

Test Result	Reference Test Result, n		Total, n
	Positive for PE	Negative for PE
MRA result
Positive	59	2	61
Negative	17	201	218
Technically inadequate	28	64	92
Total	104	267	371
MRA and MRV result*
Positive	65	4	69
Negative	6	101	107
Technically inadequate	33	161	194
Total†	104	266	370

MRA = magnetic resonance angiography; MRV = magnetic resonance venography; PE = pulmonary embolism.

^*We considered the combined MRA and MRV result to be positive if either the MRA or MRV result was positive and to be negative only if both the MRA and MRV results were negative. If the MRA or MRV result was negative but the accompanying MRV or MRA result for that patient was technically inadequate, we classified the combination of images as technically inadequate.

^†One patient who had MRA did not have MRV.