Devices and methods for measuring clinically relevant analytes in fluids

A device for measuring a level of a clinically relevant analyte in a fluid, the device including:

• a flow path for conducting said fluid through the device;
• a predetermined amount of a calibration analyte arranged on said flow path such that the calibration analyte mixes with fluid that passes it to form a calibration sample, the calibration analyte being a different species to said clinically relevant analyte;
• first detector means arranged on said flow path for detecting level of said clinically relevant analyte In the calibration sample;
• and
• second detector means arranged on said flow path for detecting a level of said calibration analyte in the calibration sample, wherein the first and second detector means are arranged on a single channel of the flow path.

A method for testing, in a portable device, levels of clinically relevant analytes in a fluid including the steps of:

• mixing a sample of the fluid with a known amount of said analyte to form a calibration sample;
• measuring the analyte level in an unadulterated sample of the fluid;
• measuring the analyte level in said calibration sample;
• and
• adjusting the analyte level measured in said unadulterated sample using the analyte level measured in said calibration sample.