“The respiratory rate (RR), also known as the respiration rate, ventilation rate, ventilatory rate, ventilation frequency (Vf), respiration frequency (Rf), pulmonary ventilation rate, or breathing frequency, is the rate (frequency) of ventilation, that is, the number of breaths (inhalation-exhalation cycles) taken within a set amount of time (typically 60 seconds)” – Wikipedia. This class represents the measurement (or “clinical observation”) of the patient’s Respiration Rate. This class re-defines the generic clinical Observation class to fix the observed characteristic to LOINC 9279-1 and to set the data type of the observation value to a Physical Quantity.