Join Date: Sep 2007
Dogs Name: Ori AKA Harold DogDog (Hairy Dog), RIP Caesar, Katana, Kip, Capri
Titles: DogDog Mouthe Extraordinaire; Kip Mr. Behavior; Capri Mis-Behavior
Dogs Age: DogDog 2 yrs?; RIP Kip 11 yrs; Capri 7 yrs; Katana 9 yrs; Caesar 13 yrs
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Refrigerating urine can definitely cause crystal formation, both oxalates and struvites (and some others). You can bring the urine sample back up to room temperature and sometime redissolve the crystals which have formed after the urine was collected. But the formation of crystals can also be affected by the urine pH which won't change merely with temperature (but which an infection can alter, hence crystals as an indication of infection).
Refrigeration will also slow down the growth of bacteria which may be contaminants in urine or a cause of an infection. If a sample is a "free catch", and is allowed to stay at room temperature for a while, the bacteria can grow and cause abnormal test results, which may give the appearance that the dog has a urinary tract infection.
So if a urine is going to sit for a bit before being tested, refrigeration is generally indicated. I would hazard to say that most of the time when a routine urinalysis is ordered, the first thing they are looking for is whether or not an infection is present.
Last edited by melbrod; 03-26-2019 at 07:08 PM.