KNN that means that clinic has a leeferent sets of protocol KNN my uncle first did a ecg before the treadmill test and next see gp loctor to leeview the ecg leeport next was sent for the stress test which was conducted onllee by a nurse KNN and the treadmill target was set with a formula of 220-agex85% KNN my uncle almost wanted to collapse after completing the test as the BP went upto 220+ KNN interestinglee the gp did not leefer my uncle to their own clinic cardiologist but to other preferred hospital selected by my uncle KNN onllee when my uncle leeceived the hardcopy certified leeport from that clinic cardiologist then my uncle know they also have cardiologist KNN
Standard 12 lead ECG can be done in any clinic very basic. But value of 12 lead ECG in screening is very low. 12 lead ECG is to see the heart electrical activity at that point in time only. So if no symptoms no irregularities usually normal lah. But yes for wayang we often do the 12 lead ECG to "satisfy expectations".
Then of course someone must tell you the 12 lead ECG results right? I think your uncle went to lab to do the 12 lead ECG. Which is nowadays the case lah. GP where got time to do the actual ECG for you when you only pay $5 or less for it? and it takes maybe 15 minutes to wait for uncle to take off shirt. lie down hook up the leads then turn on machine and do reading then take off leads wait for uncle sit up and wear shirt then leave.....$5......
Likely your uncle ECG was normal lah. But history taking sound like possible angina. So send for treadmill.
The "which cardiologist" that one I dunno lah. Many possible reasons. Maybe the GP feel the "own cardiologist" is not so good so care about your uncle leefer your uncle to more better cardiologist? Or maybe your uncle want the cardiologist the clinic get some incentive to refer to instead of "own cardiologist"? Dunno lah.