Dextrose concentration sensor for a peritoneal dialysis system

A peritoneal dialysis system, comprising:

• A dextrose source fluidly connectable to a peritoneal dialysis fluid generation flow path;
• A cycler configured to deliver a fluid from the peritoneal dialysis fluid generation flow path to a patient, wherein at least a portion of the peritoneal dialysis fluid generation flow path is disposed within the cycler;
• At least one refractive index sensor disposed within the cycler and configured to measure the refractive index of the fluid in the peritoneal dialysis fluid generation flow path, the refractive index sensor including:
• A transmitter light source, the transmitter light source operable to emit a light through the peritoneal dialysis fluid generation flow path;
• An optical receiver, the optical receiver operable to receive at least a portion of the light emitted by the transmitter light source and passing through the peritoneal dialysis fluid generation fluid flow path;
• and
• An optical fiber defining a first end and a second end, wherein at least a portion of the optical fiber between the first end and the second end is disposed within the peritoneal dialysis fluid generation flow path;
• Wherein the transmitter light source is optically couplable to the first end of the optical fiber and the optical receiver is optically couplable to the second end of the optical fiber;
• and
• A control system, wherein the control system is programmed to receive a refractive index from the at least one refractive index sensor and to determine a dextrose concentration of the fluid in the peritoneal dialysis fluid generation flow path based on the refractive index.