CLIAMS:We claim:

1. A method for determining health condition of a subject, the method comprising:
receiving, by a computing unit, a first oxygen saturation level and a second oxygen saturation level from at least two sensors;
determining, by the computing unit, cerebral extraction of oxygen using the first and second oxygen saturation levels;
comparing, by the computing unit, the cerebral extraction of oxygen with a threshold level; and
identifying, by the computing unit, a mental fatigue level of the subject based on outcome of the comparison, wherein the mental fatigue level indicates the health condition of the subject.

2. The method as claimed in claim 1, wherein at least two sensors are placed on the subject.

3. The method as claimed in claim 1, wherein the first oxygen saturation level and the second oxygen saturation level are received at a predefined time interval.

4. The method as claimed in claim 1, wherein the cerebral extraction of oxygen is determined by a difference between the first and the second oxygen saturation levels.

5. The method as claimed in claim 1, wherein the first oxygen saturation level is oxygen saturation level in the incoming blood flow via carotid artery of the subject and the second oxygen saturation level is oxygen saturation level in an outgoing blood flow via jugular vein of the subject.

6. The method as claimed in claim 1 further comprising displaying at least one of the mental fatigue level and the threshold level on a display unit associated to the computing unit.

7. The method a claimed in claim 1, wherein the threshold level comprises at least one of low threshold level, medium threshold level and high threshold level.

8. The method as claimed in claim 7 further comprising generating an alarm if the mental fatigue level is greater than at least one of medium threshold level and high threshold level.

9. The method as claimed in claim 1 further comprising detecting a measurement error while determining the mental fatigue level.

10. The method as claimed in claim 1, wherein the threshold level is personalized based on at least one of age of the subject, historical data of cerebral extraction of oxygen of the subject.

11. A computing unit for determining health condition of a subject, comprising:
a processor; and
a memory communicatively coupled to the processor, wherein the memory stores processor-executable instructions, which, on execution, causes the processor to:
receive a first oxygen saturation level and a second oxygen saturation level from at least two sensors placed on the subject;
determine cerebral extraction of oxygen using the first and second oxygen saturation levels;
compare the cerebral extraction of oxygen with a threshold level; and
identify a mental fatigue level of the subject based on outcome of the comparison, wherein the mental fatigue level indicates the health condition of the subject.

12. The computing unit as claimed in claim 11, wherein the cerebral extraction of oxygen is determined by a difference between the first and the second oxygen saturation levels.

13. The computing unit as claimed in claim 11, wherein the first oxygen saturation level is oxygen saturation level in the incoming blood flow via carotid artery of the subject and the second oxygen saturation level is oxygen saturation level in an outgoing blood flow via jugular vein of the subject.

14. The computing unit as claimed in claim 11, wherein at least one of the mental fatigue level and the threshold level is displayed on a display unit associated to the computing unit.

15. The computing unit as claimed in claim 11, wherein the threshold level is personalized based on at least one of age of the subject, historical data of cerebral extraction of oxygen of the subject.

16. A non-transitory computer readable medium including instructions stored thereon that when processed by at least one processor cause a system to perform acts of:
receiving a first oxygen saturation level and a second oxygen saturation level from at least two sensors placed on the subject;
determining cerebral extraction of oxygen using the first and second oxygen saturation levels;
comparing the cerebral extraction of oxygen with a threshold level; and
identifying a mental fatigue level of the subject based on outcome of the comparison, wherein the mental fatigue level indicates the health condition of the subject.

17. The medium as claimed in claim 16, wherein the instructions further cause the at least one processor to perform operations comprising detecting a measurement error while determining the mental fatigue level.

18. The medium as claimed in claim 16, wherein the instructions further cause the at least one processor to perform operations comprising generating an alarm if the mental fatigue level is greater than at least one of medium threshold level and high threshold level.

Dated this 24th day of September, 2014
R RAMYA RAO
OF K & S PARTNERS
AGENT FOR THE APPLICANT
,TagSPECI:TECHNICAL FIELD
The present subject matter is related, in general to health monitoring and more particularly, but not exclusively to a method and a system for determining mental fatigue level of a subject.