| Inbound Relationships | Type | Active | Source | Characteristic | Refinability | Group | 
| Fluid sample total acid measurement | Has measured component | False | Hydrogen ion concentration (observable entity) | Inferred relationship | Some |  | 
| Oxygenation index measurement | Has measured component | False | Hydrogen ion concentration (observable entity) | Inferred relationship | Some |  | 
| Feces pH NOS | Has measured component | False | Hydrogen ion concentration (observable entity) | Inferred relationship | Some |  | 
| Vomit pH NOS | Has measured component | False | Hydrogen ion concentration (observable entity) | Inferred relationship | Some |  | 
| Measurement of mixed venous partial pressure of oxygen | élément (attribut) | False | Hydrogen ion concentration (observable entity) | Inferred relationship | Some |  | 
| Oxygen measurement | élément (attribut) | False | Hydrogen ion concentration (observable entity) | Inferred relationship | Some |  | 
| Oxygen saturation measurement | élément (attribut) | False | Hydrogen ion concentration (observable entity) | Inferred relationship | Some |  | 
| Measurement of partial pressure of oxygen in blood | élément (attribut) | False | Hydrogen ion concentration (observable entity) | Inferred relationship | Some |  | 
| Measurement of venous partial pressure of oxygen | élément (attribut) | False | Hydrogen ion concentration (observable entity) | Inferred relationship | Some |  | 
| Measurement of capillary partial pressure of oxygen | élément (attribut) | False | Hydrogen ion concentration (observable entity) | Inferred relationship | Some |  | 
| Measurement of transcutaneous partial pressure of oxygen | élément (attribut) | False | Hydrogen ion concentration (observable entity) | Inferred relationship | Some |  | 
| Venous oxygen saturation measurement | élément (attribut) | False | Hydrogen ion concentration (observable entity) | Inferred relationship | Some |  | 
| Mixed venous oxygen saturation measurement | élément (attribut) | False | Hydrogen ion concentration (observable entity) | Inferred relationship | Some |  | 
| Capillary oxygen saturation measurement | élément (attribut) | False | Hydrogen ion concentration (observable entity) | Inferred relationship | Some |  | 
| Measurement of oxygen saturation at periphery | élément (attribut) | False | Hydrogen ion concentration (observable entity) | Inferred relationship | Some |  | 
| Blood oxygen concentration measurement | élément (attribut) | False | Hydrogen ion concentration (observable entity) | Inferred relationship | Some |  | 
| Arterial oxygen concentration measurement | élément (attribut) | False | Hydrogen ion concentration (observable entity) | Inferred relationship | Some |  | 
| Capillary oxygen concentration measurement | élément (attribut) | False | Hydrogen ion concentration (observable entity) | Inferred relationship | Some |  | 
| Mixed venous oxygen concentration measurement | élément (attribut) | False | Hydrogen ion concentration (observable entity) | Inferred relationship | Some |  | 
| Venous oxygen concentration measurement | élément (attribut) | False | Hydrogen ion concentration (observable entity) | Inferred relationship | Some |  | 
| Measurement of oxygen dissolved in blood | élément (attribut) | False | Hydrogen ion concentration (observable entity) | Inferred relationship | Some |  | 
| Measurement of oxygen dissolved in arterial blood | élément (attribut) | False | Hydrogen ion concentration (observable entity) | Inferred relationship | Some |  | 
| Measurement of oxygen dissolved in mixed venous blood | élément (attribut) | False | Hydrogen ion concentration (observable entity) | Inferred relationship | Some |  | 
| Measurement of oxygen dissolved in venous blood | élément (attribut) | False | Hydrogen ion concentration (observable entity) | Inferred relationship | Some |  | 
| pH profile measurement | élément (attribut) | False | Hydrogen ion concentration (observable entity) | Inferred relationship | Some |  | 
| Overnight pulse oximetry | élément (attribut) | False | Hydrogen ion concentration (observable entity) | Inferred relationship | Some |  | 
| pH-métrie ponctuelle | élément (attribut) | False | Hydrogen ion concentration (observable entity) | Inferred relationship | Some |  | 
| pH-métrie ambulatoire | élément (attribut) | False | Hydrogen ion concentration (observable entity) | Inferred relationship | Some |  | 
| pH reflux test | élément (attribut) | False | Hydrogen ion concentration (observable entity) | Inferred relationship | Some |  | 
| Oxygen saturation measurement, arterial | élément (attribut) | False | Hydrogen ion concentration (observable entity) | Inferred relationship | Some |  | 
| Scalp pH measurement | élément (attribut) | False | Hydrogen ion concentration (observable entity) | Inferred relationship | Some |  | 
| Intracardiac oxygen saturation measurement | élément (attribut) | False | Hydrogen ion concentration (observable entity) | Inferred relationship | Some |  | 
| Superior vena cava oxygen saturation measurement | élément (attribut) | False | Hydrogen ion concentration (observable entity) | Inferred relationship | Some |  | 
| Conjunctival oxygen saturation measurement | élément (attribut) | False | Hydrogen ion concentration (observable entity) | Inferred relationship | Some |  | 
| oxymétrie invasive | élément (attribut) | False | Hydrogen ion concentration (observable entity) | Inferred relationship | Some |  | 
| Jugular bulb oxygen saturation measurement | élément (attribut) | False | Hydrogen ion concentration (observable entity) | Inferred relationship | Some |  | 
| Invasive oxygen saturation monitoring (regime/therapy) | élément (attribut) | False | Hydrogen ion concentration (observable entity) | Inferred relationship | Some |  | 
| pH, combined acid measurement | élément (attribut) | False | Hydrogen ion concentration (observable entity) | Inferred relationship | Some |  | 
| pH, free acid measurement | élément (attribut) | False | Hydrogen ion concentration (observable entity) | Inferred relationship | Some |  | 
| pH, total acid measurement | élément (attribut) | False | Hydrogen ion concentration (observable entity) | Inferred relationship | Some |  | 
| Oxygen measurement, partial pressure, arterial | élément (attribut) | False | Hydrogen ion concentration (observable entity) | Inferred relationship | Some |  | 
| pH measurement, arterial | élément (attribut) | False | Hydrogen ion concentration (observable entity) | Inferred relationship | Some |  | 
| Analysis of arterial blood gases and pH (procedure) | élément (attribut) | False | Hydrogen ion concentration (observable entity) | Inferred relationship | Some |  | 
| Esophagus acid reflux test with intraluminal pH electrode | élément (attribut) | False | Hydrogen ion concentration (observable entity) | Inferred relationship | Some |  | 
| pH measurement | élément (attribut) | False | Hydrogen ion concentration (observable entity) | Inferred relationship | Some |  | 
| pH measurement, body fluid | élément (attribut) | False | Hydrogen ion concentration (observable entity) | Inferred relationship | Some |  | 
| pH measurement, venous | élément (attribut) | False | Hydrogen ion concentration (observable entity) | Inferred relationship | Some |  | 
| Measurement of faeces pH | élément (attribut) | False | Hydrogen ion concentration (observable entity) | Inferred relationship | Some |  | 
| Feces: excessive acidity | élément (attribut) | False | Hydrogen ion concentration (observable entity) | Inferred relationship | Some |  | 
| Feces: excessive alkalinity | élément (attribut) | False | Hydrogen ion concentration (observable entity) | Inferred relationship | Some |  | 
| Measurement of vomit pH | élément (attribut) | False | Hydrogen ion concentration (observable entity) | Inferred relationship | Some |  | 
| Fluid sample total acid measurement | élément (attribut) | False | Hydrogen ion concentration (observable entity) | Inferred relationship | Some |  | 
| Oxygenation index measurement | élément (attribut) | False | Hydrogen ion concentration (observable entity) | Inferred relationship | Some |  | 
| Feces pH NOS | élément (attribut) | False | Hydrogen ion concentration (observable entity) | Inferred relationship | Some |  | 
| Vomit pH NOS | élément (attribut) | False | Hydrogen ion concentration (observable entity) | Inferred relationship | Some |  | 
| Blood oxygen saturation (calculated) (procedure) | élément (attribut) | False | Hydrogen ion concentration (observable entity) | Inferred relationship | Some |  | 
| Urine acidification test | élément (attribut) | False | Hydrogen ion concentration (observable entity) | Inferred relationship | Some |  | 
| Ammonium chloride acidification test | élément (attribut) | False | Hydrogen ion concentration (observable entity) | Inferred relationship | Some |  | 
| Calcium chloride loading test | élément (attribut) | False | Hydrogen ion concentration (observable entity) | Inferred relationship | Some |  | 
| Sodium sulfate loading test | élément (attribut) | False | Hydrogen ion concentration (observable entity) | Inferred relationship | Some |  | 
| Pleural fluid pH measurement (procedure) | élément (attribut) | False | Hydrogen ion concentration (observable entity) | Inferred relationship | Some |  | 
| oxymétrie pulsée | élément (attribut) | False | Hydrogen ion concentration (observable entity) | Inferred relationship | Some |  | 
| Nitrazine analysis of vaginal fluid (procedure) | élément (attribut) | False | Hydrogen ion concentration (observable entity) | Inferred relationship | Some |  | 
| pH measurement, vaginal fluid (procedure) | élément (attribut) | False | Hydrogen ion concentration (observable entity) | Inferred relationship | Some |  | 
| Continuous pulse oximetry (procedure) | élément (attribut) | False | Hydrogen ion concentration (observable entity) | Inferred relationship | Some |  | 
| Urine pH test | élément (attribut) | False | Hydrogen ion concentration (observable entity) | Inferred relationship | Some |  | 
| Measurement of pH in vaginal fluid specimen using nitrazine yellow for detection of rupture of amniotic membrane | élément (attribut) | False | Hydrogen ion concentration (observable entity) | Inferred relationship | Some |  | 
| Measurement of pH of plasma of venous cord blood specimen at 37 degrees Celsius (procedure) | élément (attribut) | False | Hydrogen ion concentration (observable entity) | Inferred relationship | Some |  | 
| Measurement of pH of plasma of arterial blood specimen at 37 degrees Celsius (procedure) | élément (attribut) | False | Hydrogen ion concentration (observable entity) | Inferred relationship | Some |  | 
| Quantitative measurement of pH in capillary blood specimen (procedure) | élément (attribut) | False | Hydrogen ion concentration (observable entity) | Inferred relationship | Some |  | 
| Continuous measurement of pH in esophagus over 24 hour period (procedure) | élément (attribut) | False | Hydrogen ion concentration (observable entity) | Inferred relationship | Some |  | 
| Measurement of pH of serum or plasma of fetal blood specimen (procedure) | élément (attribut) | False | Hydrogen ion concentration (observable entity) | Inferred relationship | Some |  | 
| Measurement of mixed venous partial pressure of oxygen | Has measured component | False | Hydrogen ion concentration (observable entity) | Inferred relationship | Some |  | 
| Oxygen measurement | Has measured component | False | Hydrogen ion concentration (observable entity) | Inferred relationship | Some |  | 
| Oxygen saturation measurement | Has measured component | False | Hydrogen ion concentration (observable entity) | Inferred relationship | Some |  | 
| Measurement of partial pressure of oxygen in blood | Has measured component | False | Hydrogen ion concentration (observable entity) | Inferred relationship | Some |  | 
| Measurement of venous partial pressure of oxygen | Has measured component | False | Hydrogen ion concentration (observable entity) | Inferred relationship | Some |  | 
| Measurement of capillary partial pressure of oxygen | Has measured component | False | Hydrogen ion concentration (observable entity) | Inferred relationship | Some |  | 
| Measurement of transcutaneous partial pressure of oxygen | Has measured component | False | Hydrogen ion concentration (observable entity) | Inferred relationship | Some |  | 
| Venous oxygen saturation measurement | Has measured component | False | Hydrogen ion concentration (observable entity) | Inferred relationship | Some |  | 
| Mixed venous oxygen saturation measurement | Has measured component | False | Hydrogen ion concentration (observable entity) | Inferred relationship | Some |  | 
| Capillary oxygen saturation measurement | Has measured component | False | Hydrogen ion concentration (observable entity) | Inferred relationship | Some |  | 
| Measurement of oxygen saturation at periphery | Has measured component | False | Hydrogen ion concentration (observable entity) | Inferred relationship | Some |  | 
| Blood oxygen concentration measurement | Has measured component | False | Hydrogen ion concentration (observable entity) | Inferred relationship | Some |  | 
| Arterial oxygen concentration measurement | Has measured component | False | Hydrogen ion concentration (observable entity) | Inferred relationship | Some |  | 
| Capillary oxygen concentration measurement | Has measured component | False | Hydrogen ion concentration (observable entity) | Inferred relationship | Some |  | 
| Mixed venous oxygen concentration measurement | Has measured component | False | Hydrogen ion concentration (observable entity) | Inferred relationship | Some |  | 
| Venous oxygen concentration measurement | Has measured component | False | Hydrogen ion concentration (observable entity) | Inferred relationship | Some |  | 
| Measurement of oxygen dissolved in blood | Has measured component | False | Hydrogen ion concentration (observable entity) | Inferred relationship | Some |  | 
| Measurement of oxygen dissolved in arterial blood | Has measured component | False | Hydrogen ion concentration (observable entity) | Inferred relationship | Some |  | 
| Measurement of oxygen dissolved in mixed venous blood | Has measured component | False | Hydrogen ion concentration (observable entity) | Inferred relationship | Some |  | 
| Measurement of oxygen dissolved in venous blood | Has measured component | False | Hydrogen ion concentration (observable entity) | Inferred relationship | Some |  | 
| pH profile measurement | Has measured component | False | Hydrogen ion concentration (observable entity) | Inferred relationship | Some |  | 
| Overnight pulse oximetry | Has measured component | False | Hydrogen ion concentration (observable entity) | Inferred relationship | Some |  | 
| pH-métrie ponctuelle | Has measured component | False | Hydrogen ion concentration (observable entity) | Inferred relationship | Some |  | 
| pH-métrie ambulatoire | Has measured component | False | Hydrogen ion concentration (observable entity) | Inferred relationship | Some |  | 
| pH reflux test | Has measured component | False | Hydrogen ion concentration (observable entity) | Inferred relationship | Some |  | 
| Oxygen saturation measurement, arterial | Has measured component | False | Hydrogen ion concentration (observable entity) | Inferred relationship | Some |  | 
| Scalp pH measurement | Has measured component | False | Hydrogen ion concentration (observable entity) | Inferred relationship | Some |  | 
| Intracardiac oxygen saturation measurement | Has measured component | False | Hydrogen ion concentration (observable entity) | Inferred relationship | Some |  | 
| Superior vena cava oxygen saturation measurement | Has measured component | False | Hydrogen ion concentration (observable entity) | Inferred relationship | Some |  |