Sorry for the latre reply, just saw you note. Try this link;
http://emedicine.medscape.com/article/811577-overview
Scroll down to Myocardial Perfusion Testing and then to Test Utility. It shows a sensitivity of 87% to 89% which means it will detect CAD 87% to 89% of the time it is present. One other note, normal test results gives you a mere .6% chance or cardiac event for approx the next 10 years.
Hope this helps,
Jon