System for a blood analyte sensor

A sensor system for sensing a parameter in blood accessed by an access device, the sensor system comprising:

• a blood parameter sensor coupled to the access device;
• a flow control system configured to draw blood through the access device to the blood parameter sensor and flush the sensor with a calibrant to evacuate the blood;
• and
• a monitor connected in communication with the blood parameter sensor, the monitor configured to receive a blood signal when the sensor is in blood and then to receive a calibration signal when the sensor is in the calibrant and use the calibration signal to determine the parameter from the blood signal.

A blood parameter sensor system for sensing a parameter in blood, the blood parameter sensor system comprising:

• a blood sensor;
• a flow control system configured to expose the blood parameter sensor to a calibrant;
• and
• a monitor connected in communication with the blood parameter sensor, the monitor configured to receive a calibration signal and a blood signal, wherein a delay occurs between the calibration signal and blood signal,
• wherein said monitor is configured to modify the calibration signal to account for the delay and use the modified calibration signal to determine the parameter from the blood signal.

A blood parameter sensor system for sensing a parameter in blood, the blood parameter sensor system comprising:

• a blood parameter sensor;
• a flow control system configured to flow blood past the blood parameter sensor;
• and
• a monitor connected in communication with the blood parameter sensor, the monitor configured to receive a blood signal from the blood parameter sensor and determine a blood parameter from the blood signal;
• wherein the flow control system is configured to continuously flow blood past the sensor while the blood parameter sensor generates the blood signal.

A blood parameter sensor system for sensing a parameter in blood accessed by an access device, the blood parameter sensor system comprising:

• a blood parameter sensor supported by the access device;
• a monitor connected in communication with the blood parameter sensor, the monitor configured to receive a blood signal from the blood parameter sensor and determine a blood parameter waveform from the blood signal and determine a threshold from the blood parameter waveform;
• and
• a flow control system connected in communication with the monitor, configured to draw blood into the access device to the sensor and receive the threshold from the monitor and determine a blood draw volume from the threshold.