Should I tell vet about the bun's Tippex Wee?

Hi
I was wondering if I should tell the vet about the girls' Tippex wee when they go for their spay next week? Will they be able to do a urine sample while they are in the vets?

Yup they can test it there and then - my vet said sludgy wee doesn't always indicate a problem if you're concerned it's worth mentioning even if just to put your mind at ease! What veg do you feed, as it can be a sign of too much calcium in the diet?

They have no veg. I stopped giving veg to them because of their tippex wee, but it's still there. I stopped giving it to them about 1 months ago. I have reduced their SS food to one handful morning and evening, and they have timothy hay and meadow hay ab-lib.