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Evid Based Nurs 5:119 doi:10.1136/ebn.5.4.119
  • Assessment (screening or diagnosis)

Review: specific combinations of symptoms effectively rule in the diagnosis of urinary tract infection based on history alone

Table 2

Negative likelihood ratios (-LRs) for symptoms and signs that decreased the probability of urinary tract infection in women*

Symptom or sign Summary –LR (95% CI)
*Diagnostic terms defined in glossary.
Absence of dysuria 0.5 (0.3 to 0.7)
Absence of back pain 0.8 (0.7 to 0.9)
History of vaginal discharge 0.3 (0.1 to 0.9)
History of vaginal irritation 0.2 (0.1 to 0.9)
Vaginal discharge on examination 0.7 (0.5 to 0.9)

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