it works on a point system. I think from memory you're allowed 12 points.
If you are over 55 you lose 8 straight up, if you are a smoker you lose x amt if you are a drinker (which none of us are) you lose more, if your BMI is out of "normal" you lose points etc etc etc. However if your Blood pressure is over 150/80 you're up for a stress test straight up and if you're a CPL or above and your serum lipids (cholesterol, fats etc) is up then you're gone again as you would be if your lung capacity test was low.
My friend, hop on a treadmill for as long as you can until your appointment with the cardiologist. Increase the speed and incline gradually to obtain your MHR (max heart rate). If you haven't a treadmill or similar go for an hour walk preferrably to include walking up a steep hill every day. This will open up those arteries and lungs more than enough to pass the stress test. Walk at a pace as if you are late for an appointment.
The good side of all this s**t is that you will get fit cos youre probably out of condition now, the downside is the expense.