I am going to post a couple of links for you but in no way are the tests mentioned on these sites the only lab work that will help determine if your heart is OK.
CBC is not specific to heart, it is a complete blood count; you need cardiac specific labs. I agree with SC, we cannot provide you with the info your physician can but we can steer you toward sites that may help clarify ahead of time for you so you understand what your Dr. is talking about.
http://www.mayoclinic.com/health/heart-disease/HB00016
If your worrying if you have or are having a heart attack, the troponin blood test is still considered the gold standard for determining the presence of heart attack.
http://voices.yahoo.com/can-blood-test-tell-if-had-heart-attack-7367258.html
We also have a great heart forum if you want to talk with others re heart issues.