Which blood tests are most helpful in evaluating pelvic inflammatory disease?

Abstract

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).