Consider microfabricated electrochemical detectors with full electrochemical cell-on-a-chip such as http://www.abtechsci.com/eccime.html

Just some techniques - many more exist.

By PCR and fluorescent amplicon markers

http://phys.org/news/2011-07-powerful-lab-on-a-chip-genetic-analysis.html

http://phys.org/news/2013-03-inexpensive-microfluidic-device-rapid-point-of-care.html

http://phys.org/news/2013-11-slipchip-molecules-chemistry-cell.html

http://pubs.rsc.org/en/Content/ArticleLanding/2011/LC/C1LC20126C#!divAbstract

By fluorescently labelled antibodies

http://phys.org/news/2012-10-lab-on-a-chip-accelarate-medical.html

By antibodies on silicon nanowires

http://nextbigfuture.com/2012/08/lab-on-chip-using-nanowires-provides.html

By mechanical deformability

http://www.plosone.org/article/info%3Adoi%2F10.1371%2Fjournal.pone.0075901

http://www.publicaffairs.ubc.ca/2012/02/28/ubc-researcher-invents-lab-on-a-chip-device-to-study-malaria/

By sorting with an electrical field and antibodies

http://phys.org/news/2010-11-cancer-finger-video.html

By magnetically labelling and sorting

http://releases.jhu.edu/2012/06/12/using-tiny-%E2%80%98speed-bumps%E2%80%99-micro-sorting-device-could-catch-roaming-cancer-cells/

http://nextbigfuture.com/2013/04/microfluidic-device-that-captures.html

By using chromatography

http://newscenter.lbl.gov/feature-stories/2011/07/06/nmrmri-to-chromatography/

Related:

http://phys.org/news/2012-03-microfluidic-chip-microbubbles-cells-biochemical.html

Regards,

Joachim

A common and commercially available system is the Bioanalyzer from Agilent:

http://www.genomics.agilent.com/en/home.jsp

Agilent Bioanalyzer 2100 could be used for Cell, RNA and DNA analysis of various concentration

Thank you all friends,especially dear Joachim Pimiskern.

the Bioanalyzer from Agilent