To be honest I didn’t think a lab test would work on me due to my heart rate readings being of no use to find The various thresholds etc.
Although the HR readings may not mean much, they should be able to give you some flat-terrain pace benchmarks.
As Afib is a ‘heart condition’ most people/places seem to freeze when asked for advice so I’ll have to see how this goes and if they’ll test me…
I would have the same concern! Can you get a letter from your cardiologist, allowing you to be tested?
Also, there’s no reason to go to maximum. You could have them stop the test at anaerobic threshold. (Info about pace and heart rate at maximum is only useful at cocktail parties.)