It all depends on the rate in which the body metabolizes purines in food to uric acid.

The same doubt goes to the question of how long to wait after hard exercise (and the corresponding muscle breakdown to nucleic acid purines to urate.)

I can see the real possibility of testing a few hours after doing bench presses or a hard run followed by a meal of calves liver as giving a uric acid reading off the scale.

If I were doing at home testing, all tests would be on awakening before eating. That way I am comparing apples to apples. (And coincidentally that would match the conditions in my doctor's office for a blood draw...early morning, no food.) Maybe once in a blue moon I'd waste a strip on a test after the most awful conditions just to ascertain my peak (like the above exercise and liver meal with a six pack of Heinekin thrown in...oh goody, 18 mg./dL)

UA varies more slowly afaik, and the longer term is more meaningfull.

Like- days at least and weeks or months will indicate intended progress, if on a dietary course of action. That's what I expect!

I've had swings over some days, of 2.5 points which reflect supplements, diet and fluid intake in unknown measure.

Taking first thing am is a good idea as it gets it out the way and your body will be stable after a nights rest. It will be more acidic though, not sure if this is reflected in the UA readings- but this will allow  best 'day to day' comparisons to be judged.

If you want to post some figures it will be of interest here, certainly to me.

One early and a late in the day- plus any notes on gout symptoms ,if you're keen- but all info goes into the grinder here :)