Methods and reagents for quantifying analytes

1 . A method of measuring one or more analytes in a sample comprising:

adding a known quantity of a standard to said sample;

loading said sample into a microfluidic device;

separating said standard and said analyte by electrophoresis;

immobilizing said standard and said analyte;

detecting said standard and said analyte with at least one antibody; and

comparing a signal representative of said standard to a signal representative of said analyte.

2 . The method according to claim 1 wherein said standard is detected with the same antibody as said analyte.

3 . The method according to claim 1 wherein said electrophoresis is isoelectric focusing (IEF).

4 . The method according to claim 3 wherein said IEF is performed in a capillary.

5 . The method according to claim 1 wherein said electrophoresis separates the analyte by size.

6 . The method according to claim 5 wherein said separation is performed in a capillary

7 . The method according to claim 1 wherein said standard comprises an antigenic region linked to a mobility modifying region.

8 . The method according to claim 1 wherein said standard comprises a peptide.

9 . The method according to claim 8 wherein said peptide comprises all or part of the epitope used to generate the antibody.

10 . The method according to claim 1 wherein said standard comprises a polypeptide that binds antibodies.

11 . The method according to claim 10 wherein said standard is protein A or protein G.

12 . The method according to claim 1 wherein said standard contains a whole protein.

13 . The method according to claim 11 wherein said whole protein is a fusion protein.

14 . The method according to claim 11 wherein said whole protein comprises all or part of the epitope used to generate the antibody.

15 . A method of measuring at least one analyte in a sample, characterized in that: one or more analytes and a known quantity of standard are resolved and immobilized in a fluid path, and then detection reagents are conveyed through the fluid path which bind to or interact with the analytes and standard and permit detection and comparison of signals generated from said immobilized analytes and standard.

16 . A kit for measuring at least one analyte in a sample, comprising:

one or more internal standards, and

one or more antibodies that detect the one or more standards.

17 . The kit of claim 16 further comprising materials indicating the concentration of the one or more internal standards.

18 . The kit of claim 16 wherein the one or more standards is comprised of a molecule that shares an epitope with an analyte of interest.

19 . The kit of claim 16 further comprising: any one or more of capillaries, microfluidic devices, reactive moieties, buffers and detection agents.