Renal Tubular Epithelial Cells in Dogs and Cats
What a high or low result may mean, how vets interpret it, and which related markers help complete the picture
Reviewed by Dr. Lourdes Arnedo, DVM
Jun 16, 2026
Snapshot
Renal tubular epithelial cells come from the lining of the kidney tubules, the tiny tubes where urine is formed. A healthy kidney sheds very few, so none seen is the expected result. When they appear in larger numbers, the tubules may be irritated or injured. A rare cell is read as needing context rather than as abnormal, and your vet will weigh it with kidney blood values, urine concentration, and the rest of the sediment.
What is this marker?
The kidney tubules fine-tune urine, taking back water and useful substances and sending waste on its way. Their lining renews itself steadily, and a cell occasionally sheds into the urine. Under the microscope, renal tubular cells look much like other urinary epithelial cells, which is why some laboratories group them with other epithelial cells instead of reporting them separately. When a report does name them, it is pointing at cells that came from inside the kidney, not from the bladder or the path the urine took out.
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What does a high result mean in dogs and cats?
More of these cells than expected suggests the kidney tubules are irritated or injured, which can follow reduced blood flow, certain toxins or medications, infection, or active kidney disease. The finding carries more weight when it appears with cellular casts, protein in the urine, or rising kidney values. It locates the problem inside the kidney; it does not by itself name the cause, so your vet will usually pair it with blood work and your pet's history.
What does a low result mean in dogs and cats?
None seen is the normal and expected result. A rare single cell can reflect normal lining turnover and is shown as needing context rather than as abnormal. Small numbers are still worth noting, though, because these cells are not judged by the looser threshold used for bladder lining cells.
What is normal range?
Pet
Typical Range
Dogs
None seen (a rare cell needs context)
Cats
None seen (a rare cell needs context)
Reference ranges vary by laboratory and analyzer. Always use the range printed on your pet's own lab report.
Why is it tested with other markers?
These cells are interpreted with the rest of the urine sediment and the kidney blood panel.
• Cellular casts matter because tubular cells trapped inside a cast confirm they came from within the kidney.
• Creatinine, BUN, and SDMA show how well the kidneys are filtering overall.
• Urine specific gravity and urine protein show how concentrated the urine is and whether protein is being lost.
My pet's result is out of range. What should I do now?
1. Do not panic. A single off reading is a starting point, not a verdict.
2. Check how many were seen. A rare cell needs context; larger numbers, or cells found in casts, carry more weight.
3. Note symptoms and history. Tell your vet about appetite, thirst, urination, and weight, plus any medications or possible toxin exposure.
4. Recheck as advised. Your vet may repeat the urinalysis and pair it with kidney blood values to see whether the finding persists.
5. Bring questions. Use the list below at your appointment.
Questions to ask your vet
1. How many cells were seen, and were any of them inside casts?
2. Does this point to a problem inside the kidney rather than the bladder?
3. What could be irritating the tubules: blood flow, a medication, a toxin, or infection?
4. Do the kidney blood values and urine concentration tell the same story?
5. When should we recheck the urinalysis to track this?