I was told to urinate once in the morning (do not test). Then later that day test your urine. This will give you more accurate results.
You are correct. First morning urine is always more acidic. As long as the body is getting rid of acid while they are sleeping.
- Mineral buffering from digestion of food
All this happens while a person is snoozing. Or at least that is how it is supposed to work.
That way on your trip to the moring bathroom, you are getting rid of acids the body has been working to eliminate all night long.
That would make first morning urine more acidic than that of the general body fluids.[ad]