Thank you for your reply. My dietitian side that 8.0 is a little high and even a 9.9 so you think my levels should be lower. I would be happier if it was 4.0 or even a little higher. Do you know why when I first took kuvan it was a normal level. I been on kuvan for about 3 months now and it is higher now.is kuvan suppose to do that. I eat all the same way is when I first started taking my pills. Again thank you for your reply. Catcocoa.