Blood monitoring system

A device for periodically monitoring at least one parameter of blood from a patient, comprising:

• an access device configured to access blood in a patient;
• a fluid channel system connectable to the access device;
• a pump configured to transport blood through the fluid channel system;
• a dispenser connectable to the fluid channel system and configured to dispense a blood sample;
• and
• a plurality of test substrates in a cassette or cartridge;
• at least one movable sample reservoir configured to separate from the dispenser and to transport the blood sample towards a test substrate in the cassette or cartridge;
• a sensor configured to analyze the test substrate and produce a sensor signal indicative of at least one parameter;
• and
• a signal processor configured to receive the sensor signal.