If there was blood it would be there at all times. Since the test was normal, I don’t think you have anything to worry about. Rabbits can pee a rainbow of colors form pale lemon yellow to dark rust red-orange and, be perfectly fine. Some foods can produce even stranger colors. Rarely you can see green, blue or cloudy (milky) urine. All diet related and, the only one that is a concern cloudy or milky, that means there is too much calcium in the diet and, it is being excreted because the rabbit cannot use that much. Simply reduce the calcium and that clears up.

Lemon to rust red are common and normal, it’s due to pigments in the food they eat.

You told your vet this? If so and he/she isn’t concerned I wouldn’t be either. I have heard many times over how food can colour a bunny’s wee. But in the next breath – is it coloured wee? or is it actual blood? I’m sure you can tell the difference, and if it’s just wee and you told your vet and didn’t get a negative response it should be ok. But if you didn’t tell the vet, just a quick phone call (free) may be the difference between worrying and not.
No, I have never experienced this, but have read a lot on BB regarding this issue. So at the end of the day, call the vet, explain your concern and let your vet decide if you need to take further action. In the meantime, others that have had a simular experience will be sure to jump in and let you know what they think too. Cheers marinabunny.

As long as you told the vet that was the reason you were there because the wee was red, they would have noted that and as BM said it would have showed up in the test results regardless. Yep, put it down to food discolouration. No need to worry. But good for you to go to the vet to be sure – your a number 1 bunny mum! Fluffy is one lucky bunny!

The pee will sometimes change color and become brighter when it has been exposed to the air for awhile. So sometimes you will find spots that are drying up and they look differently than when the pee was fresh.

If the urine is uniform, the color is spread evenly, there is 99.9% chance that it is not blood but, pigmentation form environmental causes (usually food, though there have been reports of blue rabbit urine form wild rabbits near a chemical plant.) If it were blood, it would be splotches or clumps of dark red to coffee grounds looking splotches and, would not be a uniform color. Any problem that would cause blood in the urine would cause it to show up no matter the color of the urine, at least in amounts the lab tests could detect even if not visible to the naked eye.

The only thing I would check is if it’s cloudy (that’s too much calcium) and be sure your rabbit is getting enough water. If you have a water bottle, switch to a crock since rabbits will drink more form a dish than a bottle and, more water is good for them. If you already use a dish for water, make sure it is full and fresh at all times.

If you feed treats or food that are red, orange or, yellow try stopping those things and see if it doesn’t change in a few days. Even so, if it’s simply related to good for the rabbit foods, it isn’t a concern.

Usually its not blood if it is uniform, blood usually occurs in patches or clumps. Good job for going to the vet, I am sure she is fine. If the red pee occurs again, you can test it by mixing with hydrogen peroxide. If it bubbles, there is blood. Bunny pee does come in a rainbow of colors.