Sure, your UA can go up and down for no obvious reason after you’ve lowered it modestly through diet. Whether the fluctuations might primarily be due to dissolving crystals or to metabolic variations I can’t say (I’ve never done frequent tests or owned a testing kit).
In my opinion, you may need to be very patient if you can’t get your lowest readings under 5.5. Don’t let more frequent (if less severe) symptoms discourage you but make sure the medication you’re taking is something that you’re going to be able to tolerate on a long-term basis.
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