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Related Experiment Videos

Synovial fluid tests. What should be ordered?

R H Shmerling1, T L Delbanco, A N Tosteson

  • 1Department of Medicine, Harvard Medical School, Beth Israel Hospital, Boston, MA.

JAMA
|August 22, 1990
PubMed
Summary
This summary is machine-generated.

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Synovial fluid white blood cell count and polymorphonuclear cell percentage effectively distinguish inflammatory and noninflammatory joint diseases. Chemistry tests for synovial fluid are not recommended due to misleading results.

Area of Science:

  • Rheumatology
  • Clinical Pathology
  • Orthopedics

Background:

  • Accurate diagnosis of joint conditions relies on synovial fluid analysis.
  • The diagnostic utility of various synovial fluid tests requires clarification.

Purpose of the Study:

  • To evaluate the diagnostic performance of synovial fluid tests in differentiating inflammatory and noninflammatory joint diseases.
  • To assess the value of chemistry studies in synovial fluid analysis.

Main Methods:

  • Prospective analysis of synovial fluid test results from 100 patients undergoing arthrocentesis.
  • Sensitivity and specificity calculations for white blood cell count, polymorphonuclear cell percentage, glucose, protein, and lactate dehydrogenase.
  • Retrospective analysis of 19 patients with septic arthritis.

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Main Results:

  • White blood cell count (WBC) and polymorphonuclear cell (PMN) percentage demonstrated high sensitivity and specificity for inflammatory disease.
  • WBC count and PMN percentage provided independent diagnostic information.
  • Chemistry studies (glucose, protein, LDH) showed limited diagnostic value and were often misleading.

Conclusions:

  • Synovial fluid WBC count and PMN percentage are reliable indicators for distinguishing inflammatory from noninflammatory joint effusions.
  • Routine ordering of synovial fluid chemistry studies is discouraged due to poor diagnostic performance and potential for misinterpretation.