The problems here are twofold IMHO
1. Inconsistency
2. Process
Inconsistency - if the process is as you describe then your old GP who is still practising at that practice is doing it differently from you new GP
Process - the practice needs to communicate the result to you. By phone they have no choice but to read the results to you with the comments - in which case you'd have been fine - you would have arranged a re-test there and then. The problem is they communicated the results to you by handing them over. The flaw with that, as you have found to your cost, is that unless you read them there and then, before you go home, you are not as informed as you would have been in a phone call. That's just plain daft.
If I were you I would ask to have a meeting with the practice manager and explain to her/him that a) they are being inconsistent and b) you feel they have an obligation to contact you when there is an adverse report. I did this once when I was having a problem with an administrative issue and they sorted it. Sometimes the obvious things get overlooked. They may well thank you for your input (Don't go in guns blazing though!)
Paul Barrett
Hexham - Northumberland - Loads of spectacular walks - all I need now are the joints to go with them! :)
Enthesitis (2012)
Ulcerative Colitis (1990)