Salam,
I have visited the hospital last year due to my father's heart attack, ALHAMDULILAH he is fine now as the situation was different so we had to consult the emergency directly. I think you are supposed to get it checked from a doctor before any tests. My father was in critical condition for 10 days which is not usual at all; afterwards, 2 stents were placed in arteries.
The reason of going to PIC was that everyone recommended us there and it was more than satisfactory as everything is fine now.
So you should consult some doctor. In evening you can get appointment of many doctors in PIC. By consulting those doctors, you would get easy access to the test and laboratory department as well. or else if you have already consulted with some doctor then go and get your tests done as it would not be hectic at all.
Dr. Bilal Zikriya is the most famous personality of PIC. Or you can visit Dr. Jawad Sajid Khan, who happens to be a wonderful person, in Bahria hospital or in Mall of Lahore in his private office.
May ALLAH grant you longer and healthy life.