Which blood tests are most helpful in evaluating pelvic inflammatory disease?
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No individual or combination of blood tests can reliably diagnose pelvic inflammatory disease (PID)(strength of recommendation [SOR]: A, metaanalysis). The combination of white blood cell count, C-reactive protein (CRP), erythrocyte sedimentation rate (ESR), and vaginal white blood cells can reliably exclude PID if results for all 4 tests are normal (sensitivity=100%) (SOR: B, cohort study, reference standard not uniformly applied).
Journal of Family Practice, 53(4) 2004: 326+.