An intravascular sensor assembly insertable into an intravenous catheter, the sensor assembly comprising: a sheath having a sheath proximal end and a sheath distal end wherein an outer diameter of the sheath is sized to be substantially equal to the outer diameter of an insertion needle of the intravenous catheter; a hub sealingly connected to the sheath proximal end, the hub adapted for removably coupling to the intravenous catheter; a sensor disposed within the sheath, the sensor having a sensor shank with a shank distal end and a shank proximal end, a plurality of sensor elements including a working electrode with a reagent matrix disposed thereon, the reagent matrix comprising an enzyme capable of catalyzing a reaction involving a substrate for the enzyme and a reference electrode, the plurality of sensor elements disposed adjacent the shank distal end, a plurality of connector pads disposed at the shank proximal end wherein the plurality of connector pads are contained within the hub and the plurality of sensor elements are exposed adjacent the sheath distal end, and a plurality of elongated conductive elements wherein each of the plurality of conductive elements electrically couples one of the plurality of sensor elements to one of the plurality of connector pads; and a cable electrically coupled to the plurality of connector pads, characterized in that: the shank proximal end of the sensor shank has a pair of contact ears orthogonally folded outward in opposite directions from the sensor shank so that the contact ears are disposed substantially perpendicular to the longitudinal axis of the sensor shank, the contact ears having the connector pads exposed thereon, the connector pads all facing in one direction; and the contact ears are seated against a reference surface within the hub at a base of the hub adjacent a sheath-hub interface. a sheath having a sheath proximal end and a sheath distal end wherein an outer diameter of the sheath is sized to be substantially equal to the outer diameter of an insertion needle of the intravenous catheter; a hub sealingly connected to the sheath proximal end, the hub adapted for removably coupling to the intravenous catheter; a sensor disposed within the sheath, the sensor having a sensor shank with a shank distal end and a shank proximal end, a plurality of sensor elements including a working electrode with a reagent matrix disposed thereon, the reagent matrix comprising an enzyme capable of catalyzing a reaction involving a substrate for the enzyme and a reference electrode, the plurality of sensor elements disposed adjacent the shank distal end, a plurality of connector pads disposed at the shank proximal end wherein the plurality of connector pads are contained within the hub and the plurality of sensor elements are exposed adjacent the sheath distal end, and a plurality of elongated conductive elements wherein each of the plurality of conductive elements electrically couples one of the plurality of sensor elements to one of the plurality of connector pads; and the shank proximal end of the sensor shank has a pair of contact ears orthogonally folded outward in opposite directions from the sensor shank so that the contact ears are disposed substantially perpendicular to the longitudinal axis of the sensor shank, the contact ears having the connector pads exposed thereon, the connector pads all facing in one direction; and the contact ears are seated against a reference surface within the hub at a base of the hub adjacent a sheath-hub interface.