Systems and methods for processing analyte sensor data
The present invention relates generally to systems and methods for measuring an analyte in a host. More particularly, the present invention relates to systems and methods for processing sensor data, including calculating a rate of change of sensor data and/or determining an acceptability of sensor or reference data.
1. A method for analyzing data from an analyte sensor, the method comprising:
receiving sensor data from the analyte sensor, the sensor data comprising a plurality of sensor data points; and
calculating, using a processor module, a rate of change of the plurality of sensor data points only when the processor module determines that at least three sensor data points of the plurality of sensor data points increase continuously or decrease continuously.
2. The method of claim 1 , wherein calculating the rate of change comprises calculating a rate of change of the sensor data from the at least three sensor data points.
3. The method of claim 1 , further comprising smoothing the plurality of sensor data points.
4. The method of claim 3 , wherein smoothing is conducted using at least one of a moving average window, a regression, a finite impulse response filter, and an infinite impulse response filter.
5. The method of claim 1 , further comprising calibrating the sensor data, wherein the step of calculating the rate of change is performed on non-calibrated sensor data.
6. The method of claim 1 , further comprising determining if the rate of change is above a predetermined threshold or below a predetermined threshold.
7. The method of claim 6 , wherein the predetermined threshold is a positive 2 mg/dL/min or a negative 2 mg/dL/min.
8. A system for analyzing data from an analyte sensor, the system comprising:
a data receiving module configured to receive sensor data from the analyte sensor, the sensor data comprising a plurality of sensor data points; and
a processor module configured to calculate a rate of change of the sensor data from the plurality of sensor data points only when the processor module determines that at least three of the sensor data points of the plurality of sensor data points increase continuously or decrease continuously.
9. The system of claim 8 , wherein the processor module is configured to calculate the rate of change of the sensor data from the at least three sensor data points.
10. The system of claim 8 , wherein the processor module is further configured to smooth the plurality of sensor data points prior to calculating the rate of change.
11. The system of claim 10 , wherein the processor module is configured to smooth the plurality of sensor data points using at least one of a moving average window, a regression, a finite impulse response filter, and an infinite impulse response filter.
12. The system of claim 8 , wherein the processor module is further configured to calibrate the sensor data, and to calculate the rate of change on non-calibrated sensor data.
13. The system of claim 8 , wherein the processor module is further configured to determine if the rate of change is above a predetermined threshold or below a predetermined threshold.
14. The system of claim 13 , wherein the predetermined threshold is a positive 2 mg/dL/min or a negative 2 mg/dL/min.
15. A system for analyzing data from an analyte sensor, the system comprising:
a data receiving module configured to receive sensor data from the analyte sensor, the sensor data comprising sensor data points; and
a processor module configured to calculate a rate of change for each of a plurality of sensor data point sets and to determine a final rate of change based on the calculated rates of change, wherein each sensor data point set comprises a plurality of the sensor data points,
wherein the processor module is further configured to smooth the calculated rates of change.
16. The system of claim 15 , wherein the processor module is configured to smooth the sensor data points to accomplish calculation of the rates of change substantially without artifacts caused by noise in the sensor data.
17. The system of claim 15 , wherein each sensor data point set consists of two consecutive sensor data points.
18. The system of claim 15 , wherein the processor module is configured to determine the final rate of change by smoothing and/or averaging the calculated rates of change.
19. The system of claim 15 , wherein the processor module is further configured to form the plurality of sensor data point sets from a group of consecutive data points of the sensor data points.
20. The system of claim 15 , wherein the sensor data point sets comprise overlapping sensor data points.
21. A system for analyzing data from an analyte sensor, the system comprising:
a data receiving module configured to receive sensor data from the analyte sensor, the sensor data comprising sensor data points; and
a processor module configured to calculate a rate of change for each of a plurality of sensor data point sets and to determine a final rate of change based on the calculated rates of change, wherein each sensor data point set comprises a plurality of the sensor data points, wherein the processor module is configured to detect noise in the sensor data, and wherein the processor module is configured to calculate the rates of change dependent at least in part upon whether the noise is detected.
22. A method for analyzing data from an analyte sensor, the method comprising:
receiving sensor data from the analyte sensor, the sensor data comprising sensor data points;
detecting noise in the sensor data;
calculating, using a processor module, rates of change for a plurality of sensor data point sets, each sensor data point set comprising a plurality of the sensor data points; and
determining, using the processor module, a final rate of change based on the calculated rates of change,
wherein calculating the rates of change is dependent at least in part upon whether the noise is detected.
23. The method of claim 22 , further comprising smoothing the sensor data points to accomplish the calculation of the rates of change substantially without artifacts caused by noise in the sensor data.
24. The method of claim 22 , wherein each sensor data point set consists of two consecutive sensor data points.
25. The method of claim 22 , wherein determining the final rate of change comprises smoothing and/or averaging the calculated rates of change.
26. The method of claim 22 , further comprising forming a plurality of sensor data point sets using consecutive data points of the plurality of data points.
27. The method of claim 22 , wherein the plurality of sensor data point sets comprise overlapping sensor data points.
28. A method for analyzing data from an analyte sensor, the method comprising:
receiving sensor data from the analyte sensor the sensor data comprising sensor data points;
calculating, using a processor module, rates of change for a plurality of sensor data point sets, each sensor data point set comprising a plurality of the sensor data points;
smoothing the calculated rates of change; and
determining, using the processor module, a final rate of change based on the calculated rates of change.
29. A method for analyzing data from an analyte sensor, the method comprising:
receiving sensor data from the analyte sensor the sensor data comprising sensor data points;
calculating, using a processor module, rates of change for a plurality of sensor data point sets, each sensor data point set comprising a plurality of the sensor data points;
determining, using the processor module, a final rate of change based on the calculated rates of change; and
triggering an alert responsive to comparing the determined final rate of change to a predetermined threshold.