Not even cardiologists, according to this study from last year in Heart Rhythm. There are many pitfalls. Sometimes the T wave is not well demarcated, and in many cases is fused with the U wave (an arrhythmogenic situation in and of itself which may have the same significance as a long QT). Many times the computer doesn’t correctly make the call.
This is concerning, because proper recognition can be life saving. It’s a basic skill we should all master. As a primary care physician or emergency physician you may be the first person to see the electrocardiogram of a patient with LQTS.