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Updated: May 7, 2025

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One Size Fits Small: The Narrow Utility for Plasma Metagenomics.

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Summary
This summary is machine-generated.

Karius plasma metagenomic testing shows limited clinical utility, with 37% of orders recommended for cancellation. Many positive results were insignificant, highlighting the need for careful stewardship and cautious interpretation of potential pathogen findings.

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Area of Science:

  • Clinical Microbiology
  • Infectious Diseases
  • Genomics

Background:

  • Karius, Inc. offers plasma metagenomic sequencing for diagnosing infectious syndromes.
  • Concerns exist regarding the clinical utility and robust evidence supporting Karius testing.

Purpose of the Study:

  • To evaluate the clinical utility of Karius testing through a stewardship program.
  • To analyze the rate and significance of positive Karius test results, particularly in comparison to conventional testing and literature data.

Main Methods:

  • Retrospective review of Karius test orders over a 52-month stewardship period.
  • Analysis of Karius results compared to conventional testing and clinical adjudication by infectious diseases (ID) physicians.
  • Systematic literature review on the experience of insignificant Karius detections at other centers.

Main Results:

  • 37% of Karius orders were recommended for cancellation during stewardship.
  • Only 7% of Karius tests on samples with negative conventional testing yielded plausible positive results.
  • 29% of Karius results were deemed insignificant detections by ID physicians, with a higher rate of insignificant findings compared to significant ones.
  • Literature review indicated a median of 17.5% of patients with positive insignificant detections across studies.

Conclusions:

  • Karius plasma metagenomic testing demonstrates limited clinical utility.
  • Careful stewardship is essential to ensure appropriate test utilization and cautious interpretation of results.
  • Further investigation is needed to clarify the role and interpretation of potential pathogen detections in plasma metagenomic sequencing.