Outpatient Management of Pneumonitis: Evidence‑Based Criteria

Admission Thresholds

• Patients with an oxygen saturation (SpO₂) < 92 % on room air should be admitted to the hospital. 1

Outpatient Monitoring Requirements

• Outpatients must be reviewed by a general practitioner within 48 hours if they are not improving, or immediately if they deteriorate. 1
• Pulse‑oximetry should be performed at the initial assessment and at each follow‑up visit. 1

Oxygen‑Therapy Targets (When Supplemental Oxygen Is Needed)

• For most patients, supplemental oxygen should be titrated to maintain SpO₂ between 94 % and 98 %. [2][3]
• Nasal cannulae delivering 2–6 L/min are recommended as the initial delivery method. [3][4]
• Any patient who requires supplemental oxygen must be reassessed promptly for possible hospital admission. [2][5]

Clinical Stability Criteria for Outpatient Care

• SpO₂ ≥ 92 % on room air. 1
• Respiratory rate < 50 breaths per minute (adult). 1
• No observable difficulty breathing or grunting. 1
• Hemodynamic stability (e.g., normal blood pressure and heart rate). 6
• Ability to maintain oral intake. 1
• Availability of a family member or caregiver able to provide appropriate observation. 1

Common Pitfalls to Avoid

• Do not rely solely on a “normal” SpO₂ reading in patients already receiving supplemental oxygen, as this can mask underlying severity and occult gas‑exchange abnormalities. 5

Immediate Escalation (When to Seek Hospital Assessment)

• Any drop of SpO₂ below 92 % at any time. 1
• Clinical deterioration within 48 hours of outpatient management. 1
• Increasing oxygen flow requirements to maintain the target saturation range. [2][5]
• Development of respiratory distress, tachypnea > 50 breaths/min, or inability to maintain oral intake. 1

Special Considerations for COPD or Hypercapnic Risk Patients

• In patients with chronic obstructive pulmonary disease or other risk factors for hypercapnic respiratory failure, the target SpO₂ range should be lowered to 88 %– 92 %; these patients also require closer monitoring and a lower threshold for admission. 2