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Critical Care · Pulmonology

ROX Index for High-Flow Nasal Cannula at 2, 6, and 12 Hours calculator

Enter the published formula inputs below to calculate and interpret this score.

Clinical inputs

Use in adults with pneumonia and acute hypoxemic respiratory failure receiving high-flow nasal cannula. Calculate from values measured at 2, 6, or 12 hours after high-flow initiation.

Result

Complete all required inputs to calculate the score.

Formula inputs

  • Time after starting high-flow nasal cannula
  • Oxygen saturation (SpOâ‚‚) (%)Accepted range: 1 to 100
  • Inspired oxygen fraction (FiOâ‚‚ as 0.21–1.00) (fraction)Accepted range: 0.21 to 1
  • Respiratory rate (breaths/min) (/min)Accepted range: 1 to 100

Primary source

Roca O et al. An Index Combining Respiratory Rate and Oxygenation to Predict Outcome of Nasal High-Flow Therapy. Am J Respir Crit Care Med. DOI: 10.1164/rccm.201803-0589OC. PMID: 30576221 (2019)

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