Objective To investigate the value of the neutrophil to lymphocyte ratio(NLR)in the diagnosis of communi-ty-acquired urinary tract infection in the elderly.Methods A total of 159 elderly patients with community-acquired uri-nary tract infection(infection group)were selected from Xuanwu Hospital of Capital Medical University from January 2012 to December 2022.According to whether they progressed to bloodstream infection,they were divided into uro-de-rived bloodstream infection group(28 cases)and non-bloodstream infection group(131 cases).A total of 172 inpatients were matched for non-infectious diseases during the same period(non-infected group).ROC curve was used to analyze the clinical diagnostic value of NLR in community acquired urinary tract infection.Results The AUC of NLR was 0.729,and the optimal threshold,sensitivity and specificity were 3.5,60％and 84％,respectively.The AUC of the non-bloodstream infection group was 0.684,and the optimal threshold,sensitivity and specificity were 3.7,47％and 90％,respectively.The AUC of NLR in the diagnosis of community-acquired urinary tract infection in the elderly was 0.935,and the optimal threshold,sensitivity and specificity were 6.0,86％and 99％,respectively.Conclusion(1)NLR has diagnostic value for community-acquired urinary tract infection in elderly people.When NLR ≥ 6.0,the patient should be vigilant of progressing to bloodstream infection according to clinical manifestations and be referred to su-perior hospital in time.(2)The main pathogens of urinary tract infection are gram-negative bacteria,the most common of which is Escherichia coli.Therefore,early intervention can be performed according to the distribution characteristics of the pathogens.
Neutrophil to lymphocyte ratioDiagnosisUrinary tract infectionCommunity-acquiredThe elderly
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