Invasive testing by shooting dye into the arteries and using X-rays to see it is expensive and not without risk. You can completely injure the blood vessel, cause a stroke, have access site complications, etc. It’s also expensive.
So instead doctors will get non invasive tests like CTs or ultrasounds to see if there is narrowing of the blood vessel. If you are generally unhealthy or a smoker, there is a lower threshold for screening.
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