https://www.vetsurgeon.org/f/clinical-questions/18468/blue-urine-test-strips-in-a-cat A 12 year old neutered male cat living on a boat on a canal was presented to me last week basically as a dehydrated bag of bones with large kidneys. A comprehensive biochemistry and haematology revealed nothing significant except a slightly low PCV.en-USTelligent Community 10https://www.vetsurgeon.org/thread/111548?ContentTypeID=1Mon, 31 Mar 2014 18:52:18 GMT146601cc-3922-4be7-9974-7e1d4e45a66b:e92f04c0-40f6-457c-9cd7-a9c8444a8591Alex Allen<p>very dilute aklaine urine can give you those colours - the alkaline urine can also give you a false positive protein reading. However a low ionic level but high protein in alkaline urine will also do this!</p> <p>pH has to be around 9.0 to turn the pH indicator that blue.</p> <p>SG reading on dipsticks are unreliable as they only measure soluble cations not non-ionic solutes like proteins, glucose and urea. Did you run a refractometer SG as well? Did it suggest a higher SG? Urine protein loss??</p> <p>My guess is something like renal tubular acidosis....infection?? At 12yrs neoplasia has to be fairly high up the Ddx.</p> <p>In acute distal tubule damage the urine concentration can plummet before UREA and CREA elevate.&nbsp;</p><div style="clear:both;"></div>https://www.vetsurgeon.org/thread/111546?ContentTypeID=1Mon, 31 Mar 2014 18:47:21 GMT146601cc-3922-4be7-9974-7e1d4e45a66b:a6f52ebd-d066-4794-8504-a31139b0655bJohn Flynn<p>can&#39;t promise to be of any help, but can you specify the precise brand of dipstick?</p> <p>also asking in case any other details on the urine such as &quot;SG&quot; on a refractometer, pH meter measurement or urine sediment?</p> <p>how was the urine collected?</p> <p>how long after collection was it analysed?</p> <p>were these 3 x separate urine samples or 3 x tests on same sample?</p> <p>Is either a sample of the urine or a living cat still in existence?</p><div style="clear:both;"></div>