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Old April 26th, 2008, 04:02 PM
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Dr Lee Dr Lee is offline
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Join Date: Jun 2007
Location: Bay Area California
Posts: 1,058
Additional thoughts on Merlin.

Pre renal azotemia is often associated with mild azotemia - slight elevation of the BUN and normal or near normal creatinine. Azotemic patients with evidence of adequate urinary concentration (specific gravity >1.040 in cats) have pre-renal azotemia.

A list of pre-renal causes: consumption of a high protein diet, gastrointestinal hemorrhage, treatment with corticosteroids (as it creates a catabolic state), dehydration, hypovolemia and decreased cardiac output.

Side note on chronic renal failure in cats: most will have unconcentrated urine with a specific gravity of 1.008-1.012. Some dogs can have minimal concentration up to 1.025 and some cats can concentrate up to 0.035

Important note: since the specific gravity sometimes alters a diagnosis of pre-renal versus renal, it is important that this is not an old sample that has 'dried' up and become concentrated. I have seen cases misdiagnosed as pre-renal because of urine that was 'concentrated' by evaporation.

How is Merlin doing by the way?
Christopher A. Lee, D.V.M., C.V.L.S.
Promoting surgical options and pet comfort through the use of lasers.
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