dvm - January 2013 - (Page 35)
Carl A. Osborne, DVM, PhD, DACVIM | DIAGNOTES
21 TIPS to enhance your
By Carl A. Osborne, DVM, PhD, DACVIM, and Eugene Nwaokorie, DVM, MS
Use this list of dos and don’ts the next time you process a urine sample.
DO remember to distinguish
between in vivo and in vitro crystalluria (Table 1).
DO remember that crystalluria
cannot be reliably inferred from diagnostic urine reagent strips. Crystalluria can be confrmed only by evaluating properly collected and processed urine sediment.
DO remember that fresh nonrefrigerated urine samples are more likely to refect in vivo crystalluria. DO recognize refrigeration
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will preserve many physical, chemical and morphologic properties of urine sediment. However, refrigeration must be used with caution when evaluating crystalluria qualitatively and quantitatively. Although refrigeration of urine samples is likely to enhance the formation of various types of crystals, in vitro crystalluria may have no relationship to events occurring in the urinary tract.
Table 1: Variables inﬂuencing crystalluria
In vivo factors >Concentration of crystallogenic substances in urine (which in turn is inﬂuenced by their rate of excretion and the volume of water in which they are excreted) >Urine >Solubility of crystallogenic substances in urine >Excretion of diagnostic agents (e.g., radiopaque contrast agents) and medications (e.g., sulfonamides) >Rate of urine ﬂow In vitro factors >Temperature >Evaporation >pH >Technique of sample preparation (e.g., centrifugation vs. noncentrifugation and volume of urine examined) and preservation
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Table of Contents for the Digital Edition of dvm - January 2013
dvm - January 2013
Where did I go wrong?
Pets and Vets
CATalyst survey examines how veterinarians really feel about animal shelters and pet rescue organizations.
What’s new? What’s now?
Employee steals more than $400,000 from clinic
Longtime veterinarian killed in plane crash in California
Canadian SPCA concerned by number of “home neutering” reports
Arrest made in Minnesota veterinary hospital arson
Washington DVM accused of abusing patients, medications
When faced with disaster, practices need a plan
University of Minnesota celebrates 750,000th urolith
Death to debt
Letter of the law
dvm - January 2013