Actually nobody uses the CK anymore. There is a much more specific test called a troponin. These tests are used when the physician is unsure of the cause of the chest pain and it is not likely to be cardiac.
If there is a high liklihood of cardiac pain based on the initial assessment and EKG, the test of choice is to procede directely to the cath lab for coronary angiography. (heart catheterization)
Amen Doc, PTCA is my friend. :-}