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Sensitivity and specificity of urinalysis samples in critically ill patients.

Sensitivity and specificity of urinalysis samples in critically ill patients.
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Lee SP, Vasilopoulos T, Gallagher TJ,


Lee SP, Vasilopoulos T, Gallagher TJ, (click to view)

Lee SP, Vasilopoulos T, Gallagher TJ,

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Anaesthesiology intensive therapy 2017 07 16() doi 10.5603/AIT.a2017.0036
Abstract
BACKGROUND
Preemptive screening of urine for patients admitted to an intensive care unit can result in misinterpretation of data and over- or under-treatment of urinary tract infection.

METHODS
Data were studied from 169 consecutive patients admitted to the neurologic or burn intensive care unit at Shands Hospital at the University of Florida. All patients had a urinary catheter in place at the time of admission. Urinalysis and urine culture were sent for analysis. Data included leukocyte esterase, urine nitrate, urine protein, pyuria or urine white blood cell count, and culture.

RESULTS
Leukocyte esterase and pyuria were the most sensitive indicators of a positive urine culture at 87.5% (95% confidence interval: 71.3%-100%) and 73.3% (95% confidence interval: 51.0%-95.7%), respectively; urine nitrate was specific at 100%. More than half of the patients (56.3%) with positive cultures did not initially receive antibiotics.

CONCLUSION
The combination of leukocyte esterase and urine nitrate provides the best indicator for initiation of antibiotic coverage for urinary tract infection prior to culture availability.

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