Glossary/Abbreviations and symbols
| Abbreviations | |
| ABG | Arterial blood gas |
| AHI | Apnoea hypopnoea index |
| AOT | Ambulatory oxygen therapy |
| ASV | Adaptive servo ventilation |
| BIPAP | Bi-level positive airway pressure |
| BTS | British Thoracic Society |
| CBG | Capillary blood gas |
| CCF | Congestive cardiac failure |
| CCH | Chronic cluster headache |
| CF | Cystic fibrosis |
| CH | Cluster headache |
| CO | Carbon monoxide |
| CO2 | Carbon dioxide |
| COPD | Chronic obstructive pulmonary disease |
| CPAP | Continuous positive airway pressure |
| CRQ | Chronic respiratory disease questionnaire |
| CSA | Central sleep apnoea |
| CSB | Cheyne-stokes breathing |
| ECH | Episodic cluster headache |
| ECOG PS | Eastern Cooperative Oncology Group Performance Status |
| EEG | Electroencephalography |
| ELBG | Earlobe blood gas |
| ESS | Epworth sleepiness scale |
| FiO2 | Fraction of inspired oxygen |
| GDG | Guideline development group |
| GP | General practitioner |
| H | Hypoxaemia |
| HAD | Hospital anxiety and depression scale |
| Hb | Haemoglobin |
| HO | Home oxygen |
| HOOF | Home oxygen order form |
| HOS-AR | Home oxygen service – assessment and review |
| IPAH | Idiopathic Pulmonary Arterial Hypertension |
| IOT | Intermittent oxygen therapy |
| ILD | Interstitial lung disease |
| kPa | kilo Pascal (unit of measurement of pressure) 1kPa= 7.5mmHg |
| L/min | Litres per minute (unit of measure of flow rate of oxygen) |
| LTOT | Long term oxygen therapy |
| LVEF | Left ventricular ejection fraction |
| m | Meter (unit of measurement of length) |
| mmHg | millimetres of mercury (unit of measurement of pressure) |
| MMSE | Mini mental state examination |
| MQoLQ | Migraine quality of life questionnaire |
| MRC | Medical Research Council |
| NH | Non hypoxaemic |
| NHYA | New York Heart Association |
| NIV | Non-invasive ventilation |
| NIPPV | Non-invasive positive pressure ventilation |
| NOT | Nocturnal oxygen therapy |
| NRS | Numeric rating scale |
| OHS | Obesity Hypoventilation Syndrome |
| OT | Oxygen therapy |
| OSA | Obstructive sleep apnoea |
| O2 | Oxygen |
| PAP | Pulmonary artery pressure |
| PCO2 | Carbon dioxide tension (partial pressure) in blood or alveolus |
| PaCO2 | Arterial carbon dioxide tension (partial pressure) |
| PaO2 | Arterial oxygen tension (partial pressure) |
| PO2 | Oxygen tension (partial pressure) in blood or alveolus |
| PCU | Palliative care unit |
| PICO | Patient Intervention Control Outcome |
| POT | Palliative oxygen therapy |
| PPH | Primary pulmonary hypertension |
| pH | Unit of measurement of acidity of blood |
| QoL | Quality of life |
| REM | Rapid eye movement stage of sleep |
| SBOT | Short burst oxygen therapy |
| SD | Standard deviation |
| SDB | Sleep disorder breathing |
| SF-A | Validated sleep quality questionnaire |
| SF 36 | Short form (36) health questionnaire |
| SIGN | Scottish Intercollegiate Guideline Network |
| SaO2 | Arterial oxygen saturation measured by arterial blood gas co-oximetry |
| SpO2 | Arterial oxygen saturation measured by pulse oximetry |
| SOCC | British Thoracic Society Standards of Care Committee |
| VAS | Visual analogue scale |
| VE | Minute ventilation |
| 6MWT | 6 minute walk test |
| Symbols | |
| > | Greater than or above |
| ≤ | Less than or below |
| > | Greater than or equal to |
| ≤ | Less than or equal to |
| % | Percent |