Resumen

MANRIQUE-ABRIL, FRED GUSTAVO; RODRIGUEZ-DIAZ, JORGE  y  OSPINA-DIAZ, JUAN MANUEL. OncolDiagnostic performance of the urinalysis as a predictor of urinary infection in patients from Tunja, Colombia ogy findings of pap smear in a health provider institution of Medellín, 2010-2012. CES Med. [online]. 2014, vol.28, n.1, pp.21-34. ISSN 0120-8705.

Background: Urinalysis is a tool for the diagnosis of urinary tract infections and precedes to the urine culture for identification of the causing germ and its antibiotic sensitivity. Objective: To analyze individually and in combination, the ability of the urinalysis parameters to predict the urine culture positivity. Materials and methods: analytical crosssectional study. During three months, laboratory information was collected from an institution located in Tunja. We included a total of 1090 samples subjected to urinalysis and subsequently cultured. The urine sample should be collected properly, according to the laboratory's quality standards. We assessed sensitivity, specificity, predictive values and likelihood ratios. Results: The positivity of urine cultures was 23 %. Urinalysis parameters that reflected better performance indicators were: combination of nitrites plus turbid and bacteria plus leukocytes in the sediment, which was considered the most important in the diagnosis and therefore useful for predicting positive urine culture. The presence of more than 3 leukocytes per field reported high value of NPV, with 67 % efficiency. The presence of more than two bacteria by camp shows better specificity and efficiency of 80 %. By combining the positivity of these two parameters to predict the efficacy of urine culture result is 98.8 %, with likelihood ratio for positive result of 66. Conclusion: Combinations of some physicochemical and microscopic parameters reported in urinalysis may be diagnostic tool useful for predicting positivity in the urine culture

Palabras clave : Urinary tract infection; Diagnosis; Urinalysis; Urine culture.

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