A system for measuring one or more parameters, the system comprising: a nasal cannula comprising a main conduit and a pair of hollow prongs that extend from the main conduit, wherein the hollow prongs are configured to be inserted into the nostrils of a subject such that a flow of fluid in the main conduit is communicated to the nostrils of the subject through the hollow prongs; and one or more sensors (24, 40, 58) carried by the nasal cannula such that at least a portion of each of the one or more sensors (24, 40, 58) are disposed on or directly adjacent to at least one of the hollow prongs, the one or more sensors (24, 40, 58) being configured to generate one or more output signals that convey information related to at least one parameter related to the flow of fluid between the nostrils of the subject and the nasal cannula, wherein the at least one parameter comprises pulse oximetry, and wherein the one or more sensors (24, 40, 58) comprises a pulse oximeter with (i) an electromagnetic radiation source for emitting electromagnetic radiation incident on a wall of one of the nostrils of the subject if the hollow prongs are inserted into the nostrils of the subject and (ii) a photosensitive detector for receiving the portion of the electromagnetic radiation emitted by the electromagnetic radiation source that propagates through the wall of the nostril; wherein the pulse oximeter includes a base to which components of the pulse oximeter are mounted, wherein the base is generally U-shaped, with the electromagnetic radiation source being disposed toward one end of the base, and the photosensitive detector being disposed toward the other end of the base, such that the electromagnetic radiation source and the photosensitive detector are facing each other, wherein the pulse oximeter is removable from the nasal cannula such that the pulse oximeter can be reused with another nasal cannula, characterized in that a first electronic interface is disposed on the base and a second electronic interface is disposed on the nasal cannula such that the first electronic interface is placed in electric contact with the second electronic interface when the pulse oximeter is installed on the nasal cannula. a nasal cannula comprising a main conduit and a pair of hollow prongs that extend from the main conduit, wherein the hollow prongs are configured to be inserted into the nostrils of a subject such that a flow of fluid in the main conduit is communicated to the nostrils of the subject through the hollow prongs; and one or more sensors (24, 40, 58) carried by the nasal cannula such that at least a portion of each of the one or more sensors (24, 40, 58) are disposed on or directly adjacent to at least one of the hollow prongs, the one or more sensors (24, 40, 58) being configured to generate one or more output signals that convey information related to at least one parameter related to the flow of fluid between the nostrils of the subject and the nasal cannula, wherein the at least one parameter comprises pulse oximetry, and wherein the one or more sensors (24, 40, 58) comprises a pulse oximeter with (i) an electromagnetic radiation source for emitting electromagnetic radiation incident on a wall of one of the nostrils of the subject if the hollow prongs are inserted into the nostrils of the subject and (ii) a photosensitive detector for receiving the portion of the electromagnetic radiation emitted by the electromagnetic radiation source that propagates through the wall of the nostril; wherein the pulse oximeter includes a base to which components of the pulse oximeter are mounted, wherein the base is generally U-shaped, with the electromagnetic radiation source being disposed toward one end of the base, and the photosensitive detector being disposed toward the other end of the base, such that the electromagnetic radiation source and the photosensitive detector are facing each other, wherein the pulse oximeter is removable from the nasal cannula such that the pulse oximeter can be reused with another nasal cannula, characterized in that a first electronic interface is disposed on the base and a second electronic interface is disposed on the nasal cannula such that the first electronic interface is placed in electric contact with the second electronic interface when the pulse oximeter is installed on the nasal cannula.