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Related Experiment Videos

D-dimer Interval Likelihood Ratios for Pulmonary Embolism.

Michael A Kohn1,2, Frederikus A Klok3, Nick van Es4

  • 1Department of Epidemiology and Biostatistics, UCSF, San Francisco, CA.

Academic Emergency Medicine : Official Journal of the Society for Academic Emergency Medicine
|April 4, 2017
PubMed
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This study estimates D-dimer interval likelihood ratios (iLRs) for pulmonary embolism (PE) diagnosis. Findings help refine diagnostic strategies, showing how D-dimer levels impact PE probability.

Area of Science:

  • Medical Diagnostics
  • Clinical Pathology
  • Biomarker Research

Background:

  • Pulmonary embolism (PE) diagnosis relies on clinical assessment and biomarkers.
  • D-dimer testing is crucial, but interpreting results across different levels requires precise likelihood ratios.

Purpose of the Study:

  • To estimate D-dimer interval likelihood ratios (iLRs) for diagnosing pulmonary embolism (PE).
  • To provide data for refining PE diagnostic management strategies.

Main Methods:

  • Utilized pooled patient-level data from five PE diagnostic management studies.
  • Estimated iLRs for eight D-dimer intervals (250-5,000 ng/mL) using logistic regression.
  • Modeled a constant factor increase in likelihood ratio for each D-dimer interval increase.

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Main Results:

  • The D-dimer interval 1,000-1,499 ng/mL showed an iLR of approximately 1.0.
  • A constant factor of 2.0 was found for increasing likelihood ratios between D-dimer intervals.
  • Demonstrated that a pre-D-dimer probability of 15% requires a D-dimer < 500 ng/mL for a posttest probability < 3%.

Conclusions:

  • The derived iLRs support a decision strategy consistent with existing published methods.
  • These estimates offer a quantitative approach to interpreting D-dimer results in PE diagnosis.
  • The findings can aid clinicians in more accurately assessing PE risk based on D-dimer levels.