respiratory critical-care
SpO₂/FiO₂ (S/F) Ratio
Non-invasive surrogate for the PaO₂/FiO₂ ratio using pulse oximetry. Avoids arterial blood gas requirement. S/F ratio <315 correlates with ARDS (P/F <300).
References
- Rice TW et al. Comparison of the SpO2/FIO2 ratio and the PaO2/FIO2 ratio in patients with acute lung injury. Chest. 2007;132(2):410–417.
Related
Curated clinical cross-links plus same-class fallbacks.
Calculators
Drugs
- Dexamethasone (ICU / ARDS) · Systemic Corticosteroid
- Doxapram hydrochloride · Respiratory stimulant
- Cefuroxime · Second-Generation Cephalosporin — Respiratory / Surgical Prophylaxis
- Clarithromycin · Macrolide Antibiotic — Respiratory / H. pylori / MAC
- Amphotericin B (Liposomal) · Polyene Antifungal — Invasive Fungal Infections (Aspergillosis / Cryptococcosis / Candida)
- Anidulafungin · Echinocandin Antifungal — Invasive Candidiasis / Candidaemia
Pathways
- Acute Asthma in Adults · BTS/SIGN British Guideline on Asthma 2019; NICE NG80
- Pulmonary Embolism Assessment · NICE NG158; ESC 2019 PE Guidelines
- COPD Exacerbation Management · NICE NG115 / GOLD 2024
- Community-Acquired Pneumonia (CURB-65) · BTS 2009 / NICE NG138
- Acute Pulmonary Embolism · BTS 2003 / ESC 2019
- Pleural Effusion Assessment · BTS 2010
Decision support only — verify against MDCalc, NICE, or your local guideline before clinical use.