Sugar in Kombucha

I've been brewing kombucha, with varying degrees of success, for some time now. I'm currently eating according to the Slow Carb Diet from the Four Hour Body, which means no refined sugar, fruit, or fruit juices, six days a week. Since I don't know how much sugar kombucha has left in it, especially with such a varied brew process, I went online trying to find out. I looked at about five different sources and methods, but the results were so varied as to be useless. I think the only way to get the real story on how much sugar remains in my brew is to test it. And while it would be pretty easy to test using, say, diabetic urine strips, for glucose, I'm actually a lot more interested in how much fructose (which is way worse in almost every way) is left. Anybody who has ideas on cheap ways to test for fructose content, please let me know!

I'll be switching from the Slow Carb diet to the Paleo Solutions (which is similar but with a few important differences) at the end of the month. At that point I'll be doing a short write up of my Slow Carb experience.