Estimated A-a Gradient Age Adjusted

Expected Normal A-a Gradient by Age

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Expected Normal A-a Gradient by Age

References

  1. Kazuma Nagata. Trajectory of the arterial-alveolar oxygen gradient in COPD for a decade.. PloS one, 2025
  2. Robert Greif. 2024 International Consensus on Cardiopulmonary Resuscitation and Emergency Cardiovascular Care Science With Treatment Recommendations: Summary From the Basic Life Support; Advanced Life Support; Pediatric Life Support; Neonatal Life Support; Education, Implementation, and Teams; and First Aid Task Forces.. Circulation, 2024
  3. G. Pipitone. Alveolar–Arterial Gradient Is an Early Marker to Predict Severe Pneumonia in COVID-19 Patients. Infectious Disease Reports, 2022
  4. Amir Qaseem. Appropriate Use of High-Flow Nasal Oxygen in Hospitalized Patients for Initial or Postextubation Management of Acute Respiratory Failure: A Clinical Guideline From the American College of Physicians.. Annals of internal medicine, 2021
  5. J. Petersson. Gas exchange and ventilation–perfusion relationships in the lung. European Respiratory Journal, 2014
  6. Robert O. Crapo. Arterial blood gas reference values for sea level and an altitude of 1,400 meters.. American journal of respiratory and critical care medicine, 1999
  7. Jaume Cardús. Increase in pulmonary ventilation-perfusion inequality with age in healthy individuals.. American journal of respiratory and critical care medicine, 1997
  8. P. Stein. Alveolar-arterial oxygen gradient in the assessment of acute pulmonary embolism.. Chest, 1995
Estimated A-a Gradient Age Adjusted - Medical Calculator - Vera