Susanne is right, my strips say 15 seconds. When Ruby was diagnosed the vet did not tell me to prick for blood glucose but rather use ketodiastix to test for glucose. I inadvertantly bought ones that test just for ketones and then bought the ketodiastix. Both bottles say to dip it in the urine and compare the strip to the color chart at
precisely 15 seconds for ketones, longer for glucose.
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For the purposes of gathering the urine, I bought a SmartCat litter box and use Tidy Cat Breeze Pellets in it. The SmartCat box has a tray where the non-absorbant pellets go and the urine passes through slats in the tray and into a drawer that makes for very easy testing. You can also get the Tidy Cat box itself and not use the pee pads they sell. I love this system because the pellets last for a month, the poop sits on top so I just pick it up a couple of times a day with a poop bag and I empty the pee drawer once a day into the toilet. No/very little smell. I don't test Ruby's pee anymore since she's been regulated but still love this litterbox and will never go back to traditional litter again! It took the cats a few weeks to get used to the texture of the pellets (that wasn't so much fun

) but they have gotten very accustomed to it now and I love it.