I tend to always have a higher heart rate whenever I'm at a doctor's office compared to when I've tested resting at home (in the 100-110 range compared to 90-95), and my experience is that anything in the triple digits will tend to get some concern from whoever is taking the measurements. It's gotten to the point that I need to preemptively tell them before they take the measurements that yes, it's going to be high, but I've seen a cardiologist about it, and they didn't consider it to be an issue given that it's consistently lower when tested in other circumstances. Without that disclaimer before hand, whoever takes the measurement often will grow concerned even a rate of something like 105 and feel the need to test again and ask a lot of probing questions. At this point I have to imagine that the level of scrutiny has only made my heart rate go up even more during those tests, making the disclaimer even more necessary to avoid my visits getting derailed.
