my dr rings if it's very urgent.
Otherwise you either ring and are told it's normal or that you need to make a phone appointment with the dr. Or you can look at the results on the app.
I once rang and was told I needed an appointment, then I got a letter saying I needed to make an appointment. I had a phone appointment and the dr said there was nothing wrong and why was she speaking to me. Turns out the cold I had at the time that had raised the levels of something.