when I started following Dr. Mercola's guidelines my Ketone urine levels were 5- 40 mg/dl. Now after 2 months on the diet they have dropped down to negative or only a trace although I have been continuing to follow the guidelines.
I'd suggest jumping in on the following thread to see if your question has been answered there.
Susan Macfarlane, MScA, RD
Registered Dietitian Nutritionist
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Peetone strips only measure the excess ketones that your body is excreting. In other words, a positive reading on the strips can indicate ketosis, but a negative reading does not necessarily indicate that you are not in ketosis. I would suggest a blood ketone tester, personally I like the Precision XTra as I can get the test strips through ExpressScripts and pay for them with my FSA.