Can at home dipstick urine tests change results throughout the day? in the morning, it showed a negative result for one of the categories. 4 hours later, it looked like it could be slightly changing colors?

It can be either false positive or false, needs correlation with symptoms . Thanks

Dipstick urine test results vary with urine concentration. If urine is very concentrated (you look at the specificity, the higher specificity the more concentrated) the dipstick test can change from negative to positive.

Are you looking at the same dipstick later in the day or doing a test on a new urine specimen. Urine dipstick needs to be read within the prescribed period and not later. Composition of urine changes during the day with intake of water and food and results can differ from those in the first morning specimen. Wish you good health!